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Mất ổn định khuỷu tay

Elbow ligamentous and bony instability, including dislocation and the terrible-triad pattern.

Updated Aug 2026
Một minh họa vẽ tay của một người không có khuôn mặt đang giữ khuỷu tay sau khi khuỷu tay bị gãy trong một vụ ngã.
Các dây chằng của khuỷu tay — dây chằng trụ và dây chằng quay là các yếu tố ổn định chính. Kieran Hirpara 4.0

Trang này được dịch bằng máy và chưa được bác sĩ kiểm tra. Bản tiếng Anh là bản chính thức.

Những gì bạn đang cảm thấy

Bạn có thể cảm thấy khuỷu tay của mình bị trượt khỏi vị trí. Cảm giác này thường xảy ra khi bạn với tay lên cao hoặc đẩy chống lại lực cản. Khớp của bạn có thể cảm thấy lỏng lẻo hoặc không ổn định. Bạn có thể trải qua cơn đau nhói ở mặt ngoài của cánh tay. Cơn đau này thường bắt nguồn từ tình trạng căng cơ ở các dây chằng giữ các xương lại với nhau. Các dây chằng này đóng vai trò là các chất ổn định tĩnh để giữ cho khớp của bạn được cố định.

Cơn đau có thể bùng phát trong các hoạt động hàng ngày. Việc với tay ra sau lưng để cài áo ngực có thể kích hoạt cảm giác khó chịu. Việc nhét áo vào quần có thể cảm thấy khó khăn hoặc gây đau. Bạn có thể nhận thấy cảm giác cứng khớp khi vừa thức dậy vào buổi sáng. Cảm giác cứng khớp này thường giảm bớt khi bạn vận động cánh tay trong suốt cả ngày. Tuy nhiên, việc đẩy quá mạnh có thể khiến cơn đau quay trở lại.

Nếu bạn từng bị trật khớp trước đó, bạn có thể cảm thấy một cảm giác sắp sụp đổ. Khuỷu tay của bạn có thể bị gập lại một cách bất ngờ. Điều này phổ biến hơn nếu chấn thương liên quan đến nhiều dây chằng. Các trường hợp trật khớp đơn giản thường hồi phục tốt với việc nghỉ ngơi và theo dõi cẩn thận. Nhưng các chấn thương phức tạp liên quan đến cả mặt trước và mặt sau của khớp đòi hỏi sự chú ý nhiều hơn. Bạn cũng có thể cảm thấy đau ở mặt trong của khuỷu tay.

Một số người nhầm lẫn tình trạng mất ổn định với bệnh khuỷu taytennis. Nếu bạn có cơn đau dai dẳng ở xương khuỷu tay bên ngoài, nó có thể liên quan đến tình trạng lỏng lẻo của dây chằng. Trong những trường hợp này, các phương pháp điều trị tiêu chuẩn cho bệnh khuỷu taytennis có thể không mang lại hiệu quả. Bạn cũng có thể cảm thấy đau sâu bên trong khớp. Điều này có thể xảy ra nếu sụn khớp bị kích thích do tình trạng mất ổn định.

Đau về đêm cũng có thể xảy ra. Bạn có thể thấy khó ngủ ở bên bị ảnh hưởng. Trọng lượng của cánh tay có thể kéo căng các dây chằng bị tổn thương. Điều này gây ra cảm giác đau nhức làm gián đoạn giấc ngủ của bạn. Bạn có thể thức dậy với một khuỷu tay cứng và đau.

Trong các trường hợp nghiêm trọng, các triệu chứng có thể kéo dài. Bạn có thể trải qua tình trạng đau dai dẳng, cứng khớp hoặc cảm giác mất ổn định. Viêm khớp sau chấn thương có thể phát triển theo thời gian, làm tăng thêm sự khó chịu. Nếu các triệu chứng của bạn không cải thiện với các phương pháp điều trị bảo tồn, bác sĩ phẫu thuật của bạn sẽ thảo luận về các lựa chọn tiếp theo. Chúng tôi nhằm mục đích khôi phục sự ổn định để bạn có thể quay trở lại các hoạt động bình thường một cách an toàn.

Những gì thực sự đang xảy ra

Cùi chỏ của bạn dựa vào sự cân bằng chính xác giữa xương, dây chằng và cơ để duy trì sự ổn định. Hãy tưởng tượng các dây chằng của bạn như những sợi dây thừng chắc chắn giữ khớp của bạn lại với nhau. Những sợi dây này hoạt động đồng bộ với cơ bắp của bạn để ngăn xương trượt ra khỏi vị trí. Khi các bộ phận ổn định này bị tổn thương, cùi chỏ của bạn có thể cảm thấy lỏng lẻo hoặc không ổn định.

Vấn đề phổ biến nhất liên quan đến phức hợp dây chằng bên ngoài ở phía ngoài cánh tay của bạn. Nhóm dây chằng này ngăn xương cẳng tay quay ra xa xương cánh tay. Khi phức hợp này bị tổn thương, cùi chỏ của bạn có thể dịch chuyển theo một cách cụ thể được gọi là mất ổn định xoay sau bên. Điều này có nghĩa là các xương quay ra sau và ra ngoài khi bạn cố gắng đẩy lên hoặc đỡ lấy cơ thể. Bạn có thể cảm thấy cảm giác sụp xuống hoặc đau ở phía ngoài cùi chỏ trong những cử động này.

Đôi khi, tình trạng mất ổn định ảnh hưởng đến cả hai bên ngoài và bên trong khớp của bạn. Đây được gọi là mất ổn định phức tạp. Nó liên quan đến tổn thương nhiều cấu trúc ổn định, bao gồm cả bản thân các xương. Trong những trường hợp này, khớp mất khả năng chịu tải trọng bình thường. Các tải trọng hướng trong (varus), mô phỏng hành động đẩy lên từ ghế, có thể gây ra góc lệch bất thường tồn tại ngay cả sau khi chấn thương ban đầu. Điều này xảy ra vì lực căng bình thường trong các dây chằng của bạn đã biến mất.

Bác sĩ phẫu thuật sẽ khám cùi chỏ của bạn để xác định bộ phận ổn định nào bị suy yếu. Vì hình ảnh học không phải lúc nào cũng phân biệt được giữa một khớp cùi chỏ khỏe mạnh, linh hoạt và một khớp thực sự không ổn định, nên việc khám lâm sàng kỹ lưỡng là rất quan trọng. Chúng tôi tìm kiếm các dấu hiệu cụ thể của sự lỏng lẻo theo các hướng khác nhau. Nếu cả mất ổn định xoay sau bên và xoay sau trong đều hiện diện, chúng tôi phải xử lý cả hai khu vực để khôi phục sự ổn định toàn diện.

Mục tiêu của điều trị là sửa chữa hoặc tái tạo những "sợi dây" bị tổn thương này. Bằng cách siết chặt hoặc thay thế các dây chằng, chúng tôi giúp xương của bạn di chuyển đúng hướng trở lại. Điều này khôi phục chuyển động tự nhiên của khớp. Việc cân bằng chính xác đầu xương quay cũng rất cần thiết cho chuyển động bình thường. Nếu không có sự cân bằng này, cùi chỏ của bạn có thể không hoạt động trơn tru trong các hoạt động hàng ngày.

Những gì chúng tôi có thể làm về vấn đề này

Phương pháp tiếp cận của bác sĩ phẫu thuật của bạn phản ánh cách Dr Kieran Hirpara, một bác sĩ phẫu thuật chi trên tại Bệnh viện Tư nhân Mater Rockhampton, quản lý tình trạng này trong phòng khám của chúng tôi. Chúng tôi bắt đầu bằng cách hiểu rõ tình trạng mất ổn định cụ thể của bạn. Các trường hợp trật khuỷu tay đơn giản thường đáp ứng tốt với việc theo dõi cẩn thận và vận động có hướng dẫn. Chúng tôi sử dụng các đánh giá lâm sàng chi tiết và chụp X-quy theo dõi tuần tự để theo dõi tiến triển của bạn. Đối với nhiều bệnh nhân, điều trị bảo tồn mang lại kết quả lâm sàng và chức năng tốt.

Chúng tôi bắt đầu với việc tự quản lý và vật lý trị liệu. Chuyên viên vật lý trị liệu của bạn sẽ thiết kế một chương trình nhằm tăng cường các cơ xung quanh khuỷu tay. Điều này giúp hỗ trợ khớp và giảm cảm giác khớp bị trượt. Chúng tôi thường khuyến nghị thử phương pháp này trong một khoảng thời gian nhất định để xem liệu nó có ổn định các triệu chứng của bạn hay không. Đối với các trường hợp trật đơn giản, việc chăm sóc không phẫu thuật này thường là đủ. Nếu bạn có tình trạng mất ổn định nhẹ ở mặt ngoài của khuỷu tay, các bài tập cụ thể có thể giúp bạn lấy lại sự tự tin vào cánh tay của mình.

Quản lý y khoa tập trung vào việc kiểm soát đau và viêm. Chúng tôi có thể khuyến nghị dùng thuốc giảm đau hoặc thuốc chống viêm để giúp bạn cảm thấy thoải mái trong quá trình điều trị. Nếu tình trạng đau vẫn tiếp diễn, chúng tôi có thể thảo luận về việc tiêm thuốc. Tiêm cortisone có thể giảm sưng và đau trong một khoảng thời gian hạn chế. Tiêm axit hyaluronic hoặc huyết tương giàu tiểu cầu (PRP) cũng là các lựa chọn để hỗ trợ sức khỏe khớp. Những phương pháp điều trị này nhằm mục đích kiểm soát các triệu chứng trong khi cơ thể bạn đang lành lại hoặc tăng cường sức mạnh. Chúng không sửa chữa các vết rách cấu trúc nhưng có thể giúp việc vận động ít đau đớn hơn.

Phẫu thuật được xem xét khi việc chăm sóc bảo tồn không mang lại sự cải thiện đủ mức, hoặc nếu bạn có một vấn đề cấu trúc phức tạp. Nếu khuỷu tay của bạn đã bị trật theo nhiều hướng, chúng tôi cần xử lý cả hai bên để khôi phục sự ổn định. Chúng tôi có thể sửa chữa các dây chằng bị rách bằng cách sử dụng chỉ khâu chắc chắn hoặc băng dính y tế. Trong một số trường hợp, chúng tôi sử dụng ghép gân để tái tạo dây chằng từ xương cánh tay trên đến xương cẳng tay. Đối với tình trạng mất ổn định muộn, việc tái tạo thường mang lại kết quả khá tốt. Nếu bạn có tình trạng cứng khớp nặng hoặc dính khớp, chúng tôi có thể sử dụng cố định ngoài có khớp bản lề để giúp vận động khớp một cách an toàn.

Trong các trường hợp phức tạp, việc điều trị vẫn còn đầy thách thức. Tỷ lệ cao xảy ra tình trạng mất ổn định dai dẳng, cứng khớp hoặc đau có thể xảy ra. Chúng tôi thảo luận cởi mở về những rủi ro này. Nếu cần thay khớp, chúng tôi chọn lựa chọn thay khớp liên kết (linked arthroplasty) cho những bệnh nhân có tổn thương dây chằng đáng kể hoặc mất xương. Loại implant này được ưu tiên khi sự ổn định bị suy giảm. Chúng tôi đưa ra khuyến nghị này dựa trên quyết định chung, dựa trên phim X-quy và kết quả khám của bạn. Bác sĩ phẫu thuật của bạn sẽ giải thích chính xác phẫu thuật liên quan như thế nào trên trang riêng của nó.

Những điều cần mong đợi

Tiên lượng của bạn phụ thuộc phần lớn vào việc tình trạng mất ổn định của bạn là đơn giản hay phức tạp. Các trường hợp trật khuỷu tay đơn giản thường đáp ứng tốt với việc theo dõi cẩn thận và điều trị không phẫu thuật. Hầu hết bệnh nhân thấy các triệu chứng thuyên giảm và khôi phục được gần như toàn bộ tầm vận động gập khuỷu tay và xoay cẳng tay. Nếu trường hợp của bạn phức tạp hơn, liên quan đến tổn thương dây chằng hoặc xương đáng kể, quá trình điều trị sẽ khó khăn hơn. Các phương pháp điều trị cho những trường hợp này vẫn còn nhiều thách thức, với tỷ lệ cao hơn đối với tình trạng mất ổn định dai dẳng, cứng khớp, đau đớn và viêm xương khớp sau chấn thương (viêm xương khớp do hao mòn).

Đối với các chấn thương phức tạp, phẫu thuật thường là cần thiết để khôi phục sự ổn định. Các kỹ thuật sửa chữa và tái tạo dây chằng thường mang lại kết quả chức năng chấp nhận được. Bạn có thể mong đợi sẽ khôi phục được sự ổn định, mặc dù kết quả lâu dài của việc quản lý phẫu thuật phức tạp vẫn chưa được biết đến đầy đủ. Trong các trường hợp nặng, một số bệnh nhân có thể gặp phải các vấn đề kéo dài. Nếu bạn đã được thay khớp khuỷu tay toàn phần, mất ổn định là một nguy cơ lớn có thể đòi hỏi phải phẫu thuật thêm. Các khớp thay thế có chốt nối thường được ưu tiên khi dây chằng bị tổn thương để giảm thiểu nguy cơ này.

Quá trình hồi phục là một tiến trình diễn ra dần dần. Bạn sẽ cần được đánh giá lâm sàng chi tiết và chụp X-quang định kỳ để theo dõi quá trình lành thương. Ngay cả khi điều trị thành công, khuỷu tay bao gồm các bộ phận ổn định tĩnh và động phải hoạt động đồng bộ. Các cấu trúc này có thể cần thời gian để lành thương một cách thích hợp. Một số bệnh nhân báo cáo sự hài lòng chủ quan và kết quả tích cực sau hai năm, nhưng những người khác có thể phải đối mặt với các thách thức lâu dài. Bác sĩ phẫu thuật của bạn sẽ đồng hành cùng bạn trong hành trình này, đảm bảo các nhu cầu cụ thể của bạn được đáp ứng. Chúng tôi nhằm mục đích cung cấp thông tin rõ ràng, trung thực về những gì bạn có thể mong đợi một cách thực tế trong quá trình hồi phục.

Khi nào cần gặp bác sĩ

Hãy gặp bác sĩ đa khoa nếu bạn có đau khuỷu tay dai dẳng không cải thiện khi nghỉ ngơi. Hãy yêu cầu đánh giá bởi bác sĩ chuyên khoa nếu bạn cảm thấy yếu, mất ổn định, hoặc nếu khớp bị khóa hoặc đột ngột mất lực. Những triệu chứng này có thể ảnh hưởng đến giấc ngủ hoặc công việc của bạn. Tình trạng xấu đi đột ngột sau chấn thương cũng cần được chú ý. Mất ổn định phức tạp khuỷu tay liên quan đến các chất ổn định quan trọng về xương và dây chằng. Trật khớp đơn giản cần đánh giá lâm sàng chi tiết và theo dõi bằng tia X tuần tự. Siêu âm không thể phân biệt một cách khách quan giữa các khớp khuỷu tay khỏe mạnh và khớp khuỷu tay quá linh hoạt. Tiền sử lâm sàng và khám bệnh đầy đủ là rất quan trọng để chẩn đoán chính xác. Đánh giá sớm giúp ngăn ngừa các biến chứng lâu dài như cứng khớp hoặc viêm khớp sau chấn thương.


Evidence & references

This is the clinical evidence summary written for health professionals. It is technical, and it lists the research this page was built from. You do not need to read it to understand your treatment or to make a decision about it.

Overview

  • Complex elbow instability requires balancing stability, mobility, and concentric reduction [1].
  • Further research, particularly multicenter prospective trials, is needed for complex elbow instability due to the rare nature of these injuries [1].
  • Elbow instability in children involves nontraumatic causes as well as traumatic injuries [2].
  • Elbow arthroscopy is a valid and safe option for diagnosing and treating acute elbow instability [3].
  • Elbow arthroscopy is a valid and safe option for diagnosing and treating chronic elbow instability [3].
  • Elbow arthroscopy allows management of soft tissue lesions in elbow instability with minimal disruption [3].
  • Elbow arthroscopy allows management of associated intra-articular bone or cartilage lesions in elbow instability with minimal disruption [3].
  • Elbow arthroscopy is a valuable tool for diagnosing chronic elbow instability [6].
  • Elbow arthroscopy is a valuable tool for managing chronic elbow instability [6].
  • Elbow instability injuries are an infrequent source of disability for select NCAA athletes [4].
  • Elbow instability injuries are a serious source of disability for select NCAA athletes [4].
  • There are associated risk factors for elbow instability injuries in NCAA athletes [4].
  • Good long-term outcomes are reported after non-operative management of simple elbow dislocations [8].
  • Approximately 2% of patients require surgical intervention if simple elbow dislocations are treated nonoperatively [8].
  • Approximately 8% of patients develop persistent instability symptoms if simple elbow dislocations are treated nonoperatively [8].
  • A standard surgical protocol for treating elbow dislocations with radial head and coronoid fractures restores sufficient stability to allow early motion postoperatively [17].
  • Early motion postoperatively enhances functional outcome in elbow dislocations with radial head and coronoid fractures treated with a standard surgical protocol [17].
  • Operative repair is indicated for most fracture-dislocations of the elbow to restore sufficient osseoligamentous support [20].
  • Restoring sufficient osseoligamentous support allows safe, early motion in elbow fracture-dislocations [20].
  • Restoring sufficient osseoligamentous support provides a stable functional elbow in the long term for elbow fracture-dislocations [20].
  • Current evidence regarding the optimal elbow flexion angle for graft fixation in ulnar collateral ligament reconstruction possesses a high degree of fragility [25].
  • Further studies with objective measurements are needed to determine the optimal elbow flexion angle for graft fixation in ulnar collateral ligament reconstruction [25].
  • Surgery is indicated for unstable elbows requiring flexion beyond 50 to 60 degrees to remain reduced [27].
  • Surgery is indicated for unstable periarticular fractures [27].
  • Instability is the major complication of unlinked total elbow arthroplasty [30].
  • Instability after unlinked total elbow arthroplasty often requires revision [30].
  • Linked arthroplasty is preferred for patients with posttraumatic articular damage [30].
  • Linked arthroplasty is preferred for patients with ligamentous instability [30].
  • Linked arthroplasty is preferred for patients with deformity [30].
  • Linked arthroplasty is preferred for patients with bone loss [30].

Anatomy & Pathophysiology

  • The elbow consists of static and dynamic stabilizers that function in synchrony to prevent elbow instability [18].
  • Simple dislocations of the elbow are highly congruent joints with inherent stability provided by bony structures and dynamic stabilizers [28].
  • Understanding elbow biomechanics and the injury mechanism provides valuable insight into the variations of pathology that may be observed [21].
  • Recognising the precise pattern of injury is critical in restoring elbow function and preventing chronic instability, pain and weakness [9].
  • An understanding of the relevant anatomy and the factors associated with elbow stability allows for the application of a systematic algorithm for treatment [12].
  • Optimal outcomes are founded upon concentric reduction of the elbow [19].
  • The primary goal of treatment is stable reduction of the ulnohumeral joint and functional elbow motion [15].
  • A stiff, congruent elbow is preferable to an unstable elbow [36].
  • PLRI of the elbow remains to be fully understood [34].

Classification

  • Complex elbow instability is a distinct clinical entity requiring a balance between stability, mobility, and concentric reduction [1].
  • Complex elbow instability is rare, necessitating multicenter prospective trials for further research [1].
  • Elbow instability in children includes nontraumatic causes in addition to traumatic injuries [2].
  • The Wrightington classification of traumatic elbow instability is a comprehensive, reliable, and valid classification system [32].
  • The Wrightington classification is associated with treatment algorithms that lead to good functional outcomes [32].
  • Understanding the precise pattern of injury is critical for restoring elbow function and preventing chronic instability, pain, and weakness [9].
  • Elbow instability injuries are an infrequent but serious source of disability for select NCAA athletes [4].
  • Elbow instability injuries in NCAA athletes have associated risk factors [4].
  • The elbow consists of static and dynamic stabilizers that function in synchrony to prevent instability [18].
  • Understanding elbow biomechanics and injury mechanisms provides insight into variations of pathology in traumatic elbow instability [21].
  • Understanding patterns of traumatic elbow instability helps surgeons counsel and manage patients [7].
  • An algorithmic approach to diagnosis and treatment of complex elbow fracture-dislocations can improve diagnostic assessment and reconstruction of bony and ligamentous restraints [29].
  • A systematic algorithm for treatment of terrible triad injuries, based on anatomy and stability factors, ensures sufficient stability for early motion and improved outcomes [12].
  • A treatment algorithm for elbow dislocations, ranging from soft tissue injuries to complex fracture-dislocations, is based on clinical evidence and addresses basic scientific aspects of treating elbow stiffness [22].

Clinical Presentation

  • Complex elbow instability is a challenging clinical entity requiring a balance between stability, mobility, and concentric reduction [1].
  • Elbow instability in children includes nontraumatic causes [2].
  • Elbow arthroscopy is a valid and safe option for the diagnosis of acute elbow instability [3].
  • Elbow arthroscopy is a valid and safe option for the diagnosis of chronic elbow instability [3].
  • Elbow arthroscopy is a valid and safe option for the treatment of acute elbow instability [3].
  • Elbow arthroscopy is a valid and safe option for the treatment of chronic elbow instability [3].
  • A simple elbow dislocation that is rotationally unstable can be stabilized by simply repositioning the forearm [5].
  • Understanding the patterns of traumatic elbow instability helps the surgeon counsel and manage patients with these injuries [7].
  • Good long-term outcomes have been reported after non-operative management of simple elbow dislocations [8].
  • A small proportion (2%) of patients require surgical intervention if simple elbow dislocations are treated nonoperatively [8].
  • All patients in the series of lateral collateral ligament instability had resolution of their symptoms of instability [10].
  • Patients with lateral collateral ligament instability regained a near full arc of elbow flexion and forearm rotation [10].
  • Fixation or replacement of injured bony elements, ligamentous repair, and hinged fixation may be used to successfully manage complex elbow instability [11].
  • An understanding of the relevant anatomy and factors associated with elbow stability allows the application of a systematic algorithm for treatment of terrible triad injuries [12].
  • The systematic algorithm for terrible triad injury treatment helps ensure sufficient elbow stability to allow early motion [12].
  • Early motion in terrible triad injury leads to improved outcomes in most patients [12].
  • The next challenge for elbow surgeons is to diagnose and fix persistent subclinical instability after surgery to prevent the onset of post-traumatic osteoarthritis [13].
  • Simple elbow dislocations are usually managed by closed reduction and early motion [16].
  • Recurrent instability is uncommon in simple elbow dislocations due to intrinsic bony stability [16].
  • Posterolateral rotatory instability of the elbow is a clinical syndrome caused by insufficiency of the lateral ulnar collateral ligament [23].
  • Posterolateral rotatory instability of the elbow presents with clicking, locking, or recurrent dislocation [23].
  • Most simple elbow dislocations are readily managed nonoperatively [24].
  • Most simple elbow dislocations are amenable to early mobilization [24].
  • The variability in patients' pathoanatomic conditions in chronic complex persistent elbow instability requires customized surgical treatment [31].
  • Surgical treatment for chronic complex persistent elbow instability is aimed at elbow stabilizer reconstruction when the ulnohumeral joint is preserved [31].
  • Surgical treatment for chronic complex persistent elbow instability is aimed at joint replacement in case of severe articular degeneration [31].

Investigations

  • Complex elbow instability requires recognition of the precise injury pattern to restore function and prevent chronic instability, pain, and weakness [9].
  • Elbow instability injuries are an infrequent but serious source of disability for select National Collegiate Athletic Association (NCAA) athletes [4].
  • Proximal radioulnar translocation with radial neck fracture and elbow dislocation is an extremely rare injury in children that requires careful radiographic evaluation to avoid delayed diagnosis [46].
  • Concomitant vascular lesions, such as brachial artery transection, must be considered when confronted with elbow dislocations [44].
  • Elbow arthroscopy is a valid and safe option for the diagnosis of both acute and chronic elbow instability [3].
  • Elbow arthroscopy is a valuable tool in the diagnosis of chronic elbow instability [6].
  • Nontraumatic causes of elbow instability in children are addressed in current concepts of pediatric elbow injuries [2].

Treatment

Non-Operative Management

  • Most simple elbow dislocations are readily managed nonoperatively and are amenable to early mobilization [24].
  • Conservative treatment with early functional training of the elbow remains the first-line therapy for simple elbow dislocation [43].
  • Simple elbow dislocations should be managed with early range of motion, as most do not require surgery [42].
  • Rehabilitation programs for simple elbow dislocations should stress early active range of motion through the stable arc of motion [5].

Operative Management

  • Operative repair is indicated for most fracture-dislocations of the elbow to restore sufficient osseoligamentous support to allow safe, early motion and provide a stable functional elbow in the long term [20].
  • Surgery is indicated for unstable elbows requiring flexion beyond 50 to 60 degrees to remain reduced or for unstable periarticular fractures [27].
  • Elbow valgus instability in the throwing athlete may be managed either nonsurgically or surgically [39].
  • Use of a standard surgical protocol for elbow dislocations with radial head and coronoid fractures restored sufficient elbow stability to allow early motion postoperatively, enhancing the functional outcome [17].
  • Both Jobe and Docking techniques are safe and effective in the treatment of posterolateral elbow instability [26].

Arthroscopic Management

  • Elbow arthroscopy has become a valid and safe option for the diagnosis and treatment of both acute and chronic elbow instability, allowing for the management of soft tissue lesions and associated intra-articular bone or cartilage lesions with minimal disruption [3].
  • Elbow arthroscopy is a valuable tool in the diagnosis and management of chronic elbow instability [6].
  • Elbow arthroscopy is not necessarily contraindicated in patients with a subluxating or transposed ulnar nerve [35].

Surgical Goals and Outcomes

  • The primary goal of treatment for nonacute elbow fracture with persistent ulnohumeral dislocation or subluxation is stable reduction of the ulnohumeral joint and functional elbow motion [15].
  • Optimal outcomes for traumatic elbow instability are founded upon concentric reduction of the elbow [19].
  • Complex elbow instability requires a balance between stability, mobility, and concentric reduction [1].
  • Despite progress in surgical techniques and rehabilitation, treatments for elbow instability remain challenging with high rates of persistent instability, post-traumatic arthritis, stiffness, and pain in demanding cases [33].
  • Few patients with simple elbow dislocations develop complications requiring surgery [14].
  • Patients with simple elbow dislocations who require surgery most commonly undergo soft-tissue stabilisation or contracture release within 4 years of the injury [14].
  • A small proportion (2%) of patients require surgical intervention for simple elbow dislocations [8].

Complications

  • Approximately 8% of patients treated nonoperatively for simple elbow dislocation develop persistent instability symptoms [8].
  • A small proportion (2%) of patients with simple elbow dislocation require surgical intervention [8].
  • Persistent subclinical instability after surgery can lead to the onset of post-traumatic osteoarthritis [13].
  • Patients with simple elbow dislocations who develop complications most commonly undergo soft-tissue stabilisation or contracture release within 4 years of the injury [14].
  • Instability is the major complication of unlinked total elbow arthroplasty, often requiring revision [30].
  • Linked arthroplasty is preferred for patients with posttraumatic articular damage, ligamentous instability, deformity, or bone loss [30].
  • Ulnar collateral ligament reconstruction (UCLR) demonstrates low complication and revision rates at minimum 48-month mean follow-up [38].
  • There is a distinct difference in complication profile between external fixation and the IJS when used as treatment for traumatic elbow instability [40].

Recovery

  • Rehabilitation programs for rotationally unstable simple elbow dislocations should stress early active range of motion through the stable arc of motion [5].
  • Non-operative management of simple elbow dislocations yields good long-term outcomes [8].
  • Approximately 2% of patients treated nonoperatively for simple elbow dislocation require surgical intervention [8].
  • Recognizing the precise pattern of injury is critical in restoring elbow function and preventing chronic instability, pain, and weakness [9].
  • Diagnosing and fixing persistent subclinical instability after surgery is necessary to prevent the onset of post-traumatic osteoarthritis [13].
  • Patients with simple elbow dislocations who require subsequent surgery most commonly undergo soft-tissue stabilization or contracture release within 4 years of the injury [14].
  • Recurrent instability is uncommon after simple elbow dislocation due to intrinsic bony stability [16].
  • Use of a standard surgical protocol for elbow dislocations with radial head and coronoid fractures restores sufficient elbow stability to allow early motion postoperatively [17].
  • Early motion postoperatively enhances functional outcome in the treatment of elbow dislocations with radial head and coronoid fractures [17].
  • Athletes with elbow dislocation demonstrate excellent functional outcomes and high return to sport rates [41].
  • Most athletes with elbow dislocation return to sport within 10 weeks [41].
  • The prognosis for simple elbow dislocations is better than for complex dislocations [47].
  • Prolonged immobilization is associated with unsatisfactory results in elbow dislocations [47].

Key Evidence

  • [L5] Complex elbow instability remains a challenging clinical entity requiring a balance between stability, mobility, and concentric reduction; further research, particularly multicenter prospective trials, is needed due to the rare nature of these injuries. [1] (10.1016/j.hcl.2007.11.010)
  • [L5] The article reviews current concepts of injuries leading to elbow instability in children, discusses recognition and treatment of instability, and addresses nontraumatic causes. [2] (10.1016/j.hcl.2007.11.007)
  • [L5] Elbow arthroscopy has become a valid and safe option for the diagnosis and treatment of both acute and chronic elbow instability, allowing for the management of soft tissue lesions and associated intra-articular bone or cartilage lesions with minimal disruption. [3] (10.1016/j.jseint.2022.12.001)
  • [L4] Elbow instability injuries are an infrequent but serious source of disability for select NCAA athletes, with a number of associated risk factors. [4] (10.1177/2325967117750105)
  • [L5] A simple elbow dislocation that is rotationally unstable can be stabilized by simply repositioning the forearm, and rehabilitation programs should stress early active range of motion through the stable arc of motion. [5] (10.1016/j.hcl.2015.06.002)
  • [L4] Elbow arthroscopy is a valuable tool in the diagnosis and management of chronic elbow instability. [6] (10.1016/j.arthro.2013.08.016)
  • [L5] Understanding the patterns of traumatic elbow instability helps the surgeon counsel and manage patients with these injuries. [7] (10.1016/j.jhsa.2010.05.002)
  • [L5] Good long-term outcomes have been reported after non-operative management of simple elbow dislocations; however, a small proportion (2%) of patients require surgical intervention and approximately 8% develop persistent instability symptoms if treated nonoperatively. [8] (10.1177/1758573217694163)
  • [Paper] Recognising the precise pattern of injury is critical in restoring elbow function and preventing chronic instability, pain and weakness. [9] (10.1016/j.injury.2013.09.032)
  • [L4] All patients in the series had resolution of their symptoms of instability and regained a near full arc of elbow flexion and forearm rotation. [10] (10.1016/j.hcl.2007.11.001)
  • [L5] Fixation or replacement of injured bony elements, ligamentous repair, and hinged fixation may be used to successfully manage complex elbow instability. [11] (10.5435/00124635-200605000-00003)
  • [L5] Despite the complexities of this injury, an understanding of the relevant anatomy and the factors associated with elbow stability allows the application of a systematic algorithm for treatment that can help ensure sufficient elbow stability to allow early motion, thereby leading to improved outcomes in most patients. [12] (10.5435/00124635-200903000-00003)
  • [L5] The next challenge for elbow surgeons is to diagnose and fix persistent subclinical instability after surgery to prevent the onset of post-traumatic osteoarthritis. [13] (10.1016/j.jseint.2023.03.018)
  • [Paper] Few patients with simple elbow dislocations develop complications requiring surgery, but those that do most commonly undergo soft-tissue stabilisation or contracture release within 4 years of the injury. [14] (10.1016/j.injury.2015.02.009)
  • [L5] The primary goal of treatment is stable reduction of the ulnohumeral joint and functional elbow motion. [15] (10.2106/jbjs.m.00817)
  • [L5] Simple elbow dislocations are usually managed by closed reduction and early motion, with recurrent instability being uncommon due to intrinsic bony stability. [16] (10.1016/j.hcl.2007.11.012)
  • [L4] Use of the surgical protocol restored sufficient elbow stability to allow early motion postoperatively, enhancing the functional outcome. [17] (10.2106/jbjs.d.02933)
  • [L5] The elbow consists of static and dynamic stabilizers that function in synchrony to prevent elbow instability. [18] (10.1016/j.jhsa.2016.11.025)
  • [L5] Optimal outcomes are founded upon concentric reduction of the elbow. [19] (10.1016/j.jseint.2023.03.020)
  • [L5] Operative repair is indicated for most of these injuries to restore sufficient osseoligamentous support to allow safe, early motion and provide a stable functional elbow in the long term. [20] (10.1016/j.hcl.2004.06.005)
  • [L4] Understanding elbow biomechanics and the injury mechanism provides valuable insight into the variations of pathology that may be observed. [21] (10.5435/jaaos-d-14-00023)
  • [L5] The authors present a treatment algorithm based on their clinical evidence and discuss new basic scientific aspects of treating elbow stiffness. [22] (10.1155/2013/951397)
  • [L5] Posterolateral rotatory instability of the elbow is a clinical syndrome caused by insufficiency of the lateral ulnar collateral ligament, presenting with clicking, locking, or recurrent dislocation. [23] (10.5435/00124635-200411000-00005)
  • [L5] Most simple elbow dislocations are readily managed nonoperatively and are amenable to early mobilization. [24] (10.1016/j.hcl.2020.07.013)
  • [L4] However, the available current evidence possesses a high degree of fragility, and further studies are needed with objective measurements to determine the optimal elbow flexion angle for graft fixation. [25] (10.1016/j.jse.2018.07.029)
  • [L1] This systematic review showed that both Jobe and Docking techniques are safe and effective in the treatment of posterolateral elbow instability. [26] (10.1016/j.injury.2020.11.010)
  • [L5] Surgery is indicated for unstable elbows requiring flexion beyond 50 to 60 degrees to remain reduced or for unstable periarticular fractures. [27] (10.5435/00124635-199801000-00002)
  • [L5] Simple dislocations of the elbow are highly congruent joints with inherent stability provided by bony structures and dynamic stabilizers, allowing for early active range of motion during rehabilitation. [28] (10.1016/j.hcl.2004.07.002)
  • [L5] An algorithmic approach to the diagnosis and treatment of complex elbow fracture-dislocation injuries can improve the diagnostic assessment and reconstruction of the bony and ligamentous restraints to restore a stable and functional elbow. [29] (10.5435/jaaos-d-23-00460)
  • [L4] Instability is the major complication of unlinked total elbow arthroplasty, often requiring revision, whereas linked arthroplasty is preferred for patients with posttraumatic articular damage, ligamentous instability, deformity, or bone loss. [30] (10.1016/j.hcl.2007.11.002)
  • [L4] The variability in patients' pathoanatomic conditions requires customized surgical treatment aimed at elbow stabilizer reconstruction when the ulnohumeral joint is preserved or aimed at joint replacement in case of severe articular degeneration. [31] (10.1016/j.jse.2019.11.021)
  • [L5] The Wrightington classification of elbow fracture dislocation is a comprehensive, reliable, and valid classification with treatment algorithms that are associated with good functional outcomes. [32] (10.1016/j.jseint.2022.12.002)
  • [L5] Despite progress in surgical techniques and rehabilitation, treatments for elbow instability remain challenging with high rates of persistent instability, post-traumatic arthritis, stiffness, and pain in demanding cases. [33] (10.1136/jisakos-2019-000316)
  • [L4] PLRI of the elbow remains to be fully understood. [34] (10.1016/j.arthro.2014.02.029)
  • [L4] Elbow arthroscopy is not necessarily contraindicated in patients with a subluxating or transposed ulnar nerve. [35] (10.1016/j.arthro.2009.04.024)
  • [L5] A stiff, congruent elbow is preferable to an unstable elbow. [36] (10.1016/j.hcl.2017.09.008)
  • [L4] UCLR provides excellent patient-reported and clinical outcomes to patients at medium-term follow-up with low complication and revision rates. [38] (10.1136/jisakos-2021-000614)
  • [L5] Elbow valgus instability in the throwing athlete may be managed either nonsurgically or surgically. [39] (10.5435/00124635-200611000-00014)
  • [L4] The literature demonstrates a distinct difference in complication profile between external fixation and the IJS when used as treatment for traumatic elbow instability. [40] (10.1016/j.xrrt.2023.12.004)
  • [L4] Athletes with elbow dislocation demonstrated excellent functional outcomes and high return to sport rates, with most returning within 10 weeks. [41] (10.1177/23259671261419505)
  • [L5] Simple elbow dislocations should be managed with early range of motion, as most do not require surgery. [42] (10.1016/j.hcl.2016.08.003)
  • [L1] Conservative treatment with early functional training of the elbow remains the first-line therapy for simple elbow dislocation. [43] (10.1186/s12891-024-07260-0)
  • [Case_report] This case should sensitize the readers for concomitant vascular lesions when confronted with elbow dislocations. [44] (10.1007/s00167-010-1202-5)
  • [Case_report] Proximal radioulnar translocation with radial neck fracture and elbow dislocation is an extremely rare injury in children that requires careful radiographic evaluation to avoid delayed diagnosis. [46] (10.1007/s00402-013-1820-8)
  • [L5] The prognosis for simple dislocations is better than for complex dislocations, and prolonged immobilization is associated with unsatisfactory results. [47] (10.1016/j.csm.2004.04.014)

References

[1] Complex Elbow Instability. Hand Clinics. 2008. DOI: 10.1016/j.hcl.2007.11.010

[2] Elbow Instability in Children. Hand Clinics. 2008. DOI: 10.1016/j.hcl.2007.11.007

[3] The role of arthroscopy in instability of the elbow. JSES International. 2023. DOI: 10.1016/j.jseint.2022.12.001

[4] Elbow Dislocation and Subluxation Injuries in the National Collegiate Athletic Association, 2009-2010 Through 2013-2014. Orthopaedic Journal of Sports Medicine. 2018. DOI: 10.1177/2325967117750105

[5] Simple Elbow Dislocation. Hand Clinics. 2015. DOI: 10.1016/j.hcl.2015.06.002

[6] The Role of Arthroscopy in Chronic Elbow Instability. Arthroscopy. 2013. DOI: 10.1016/j.arthro.2013.08.016

[7] Traumatic Elbow Instability. The Journal of Hand Surgery. 2010. DOI: 10.1016/j.jhsa.2010.05.002

[8] Simple elbow dislocation. Shoulder & Elbow. 2017. DOI: 10.1177/1758573217694163

[9] Complex instability of the elbow. Injury. 2017. DOI: 10.1016/j.injury.2013.09.032

[10] Lateral Collateral Ligament Instability of the Elbow. Hand Clinics. 2008. DOI: 10.1016/j.hcl.2007.11.001

[11] Complex Elbow Instability. Journal of the American Academy of Orthopaedic Surgeons. 2006. DOI: 10.5435/00124635-200605000-00003

[12] Terrible Triad Injury of the Elbow: Current Concepts. Journal of the American Academy of Orthopaedic Surgeons. 2009. DOI: 10.5435/00124635-200903000-00003

[13] Terrible triad injury of the elbow: a spectrum of theories. JSES International. 2023. DOI: 10.1016/j.jseint.2023.03.018

[14] The frequency and risk factors for subsequent surgery after a simple elbow dislocation. Injury. 2015. DOI: 10.1016/j.injury.2015.02.009

[15] Nonacute Treatment of Elbow Fracture with Persistent Ulnohumeral Dislocation or Subluxation. Journal of Bone and Joint Surgery. 2014. DOI: 10.2106/jbjs.m.00817

[16] Acute Dislocations of the Adult Elbow. Hand Clinics. 2008. DOI: 10.1016/j.hcl.2007.11.012

[17] Standard Surgical Protocol to Treat Elbow Dislocations with Radial Head and Coronoid Fractures. Journal of Bone and Joint Surgery. 2005. DOI: 10.2106/jbjs.d.02933

[18] Elbow Instability: Anatomy, Biomechanics, Diagnostic Maneuvers, and Testing. The Journal of Hand Surgery. 2017. DOI: 10.1016/j.jhsa.2016.11.025

[19] Coronoid fractures and traumatic elbow instability. JSES International. 2023. DOI: 10.1016/j.jseint.2023.03.020

[20] Fracture-dislocation of the elbow: diagnosis, treatment, and prognosis. Hand Clinics. 2004. DOI: 10.1016/j.hcl.2004.06.005

[21] Management of Complex Elbow Dislocations. Journal of the American Academy of Orthopaedic Surgeons. 2015. DOI: 10.5435/jaaos-d-14-00023

[22] Elbow Dislocations: A Review Ranging from Soft Tissue Injuries to Complex Elbow Fracture Dislocations. Advances in Orthopedics. 2013. DOI: 10.1155/2013/951397

[23] Posterolateral Rotatory Instability of the Elbow. Journal of the American Academy of Orthopaedic Surgeons. 2004. DOI: 10.5435/00124635-200411000-00005

[24] Elbow Instability. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.07.013

[25] Elbow flexion angle during graft fixation for ulnar collateral ligament reconstruction: a systematic review of outcomes and complications. Journal of Shoulder and Elbow Surgery. 2018. DOI: 10.1016/j.jse.2018.07.029

[26] Lateral collateral ulnar ligament reconstruction techniques in posterolateral rotatory instability of the elbow: A systematic review. Injury. 2022. DOI: 10.1016/j.injury.2020.11.010

[27] Acute Elbow Dislocation: Evaluation and Management. Journal of the American Academy of Orthopaedic Surgeons. 1998. DOI: 10.5435/00124635-199801000-00002

[28] Simple dislocations of the elbow: evaluation and treatment. Hand Clinics. 2004. DOI: 10.1016/j.hcl.2004.07.002

[29] Complex Elbow Fracture-Dislocations: An Algorithmic Approach to Treatment. Journal of the American Academy of Orthopaedic Surgeons. 2024. DOI: 10.5435/jaaos-d-23-00460

[30] Instability After Total Elbow Arthroplasty. Hand Clinics. 2008. DOI: 10.1016/j.hcl.2007.11.002

[31] Chronic complex persistent elbow instability: a consecutive and prospective case series and review of recent literature. Journal of Shoulder and Elbow Surgery. 2020. DOI: 10.1016/j.jse.2019.11.021

[32] “How the Wrightington classification of traumatic elbow instability can simplify the algorithm for treatment”. JSES International. 2023. DOI: 10.1016/j.jseint.2022.12.002

[33] Treatment of elbow instability: state of the art. Journal of ISAKOS. 2021. DOI: 10.1136/jisakos-2019-000316

[34] Surgical Treatment of Posterolateral Rotatory Instability of the Elbow. Arthroscopy. 2014. DOI: 10.1016/j.arthro.2014.02.029

[35] Is Elbow Arthroscopy Safe in Patients with a Subluxating ulnar nerve or Previous Ulnar Nerve Transposition? (SS‐24). Arthroscopy. 2009. DOI: 10.1016/j.arthro.2009.04.024

[36] Elbow Fractures with Instability. Hand Clinics. 2018. DOI: 10.1016/j.hcl.2017.09.008

[38] Ulnar collateral ligament reconstruction of the elbow at minimum 48-month mean follow-up demonstrates excellent clinical outcomes with low complication and revision rates: systematic review. Journal of ISAKOS. 2021. DOI: 10.1136/jisakos-2021-000614

[39] Elbow Valgus Instability in the Throwing Athlete. Journal of the American Academy of Orthopaedic Surgeons. 2006. DOI: 10.5435/00124635-200611000-00014

[40] Comparing internal and external stabilization for traumatic elbow instability: a systematic review. JSES Reviews, Reports, and Techniques. 2024. DOI: 10.1016/j.xrrt.2023.12.004

[41] Return to Sport Following Elbow Dislocation: A Systematic Review. Orthopaedic Journal of Sports Medicine. 2026. DOI: 10.1177/23259671261419505

[42] Elbow Dislocations in Contact Sports. Hand Clinics. 2017. DOI: 10.1016/j.hcl.2016.08.003

[43] Treatment strategies for simple elbow dislocation - a systematic review. BMC Musculoskeletal Disorders. 2024. DOI: 10.1186/s12891-024-07260-0

[44] Brachial artery transection caused by closed elbow dislocation in a mature in‐line skater: a case report with review of the literature. Knee Surgery, Sports Traumatology, Arthroscopy. 2010. DOI: 10.1007/s00167-010-1202-5

[46] Proximal radioulnar translocation associated with elbow dislocation and radial neck fracture in child: a case report and review of literature. Archives of Orthopaedic and Trauma Surgery. 2013. DOI: 10.1007/s00402-013-1820-8

[47] Elbow dislocations in adults and children. Clinics in Sports Medicine. 2004. DOI: 10.1016/j.csm.2004.04.014

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By exercising the Licensed Rights (defined below), You accept and agree to be bound by the terms and conditions of this Creative Commons Attribution-NonCommercial 4.0 International Public License ("Public License"). To the extent this Public License may be interpreted as a contract, You are granted the Licensed Rights in consideration of Your acceptance of these terms and conditions, and the Licensor grants You such rights in consideration of benefits the Licensor receives from making the Licensed Material available under these terms and conditions.

Section 1 -- Definitions.

a. Adapted Material means material subject to Copyright and Similar Rights that is derived from or based upon the Licensed Material and in which the Licensed Material is translated, altered, arranged, transformed, or otherwise modified in a manner requiring permission under the Copyright and Similar Rights held by the Licensor. For purposes of this Public License, where the Licensed Material is a musical work, performance, or sound recording, Adapted Material is always produced where the Licensed Material is synched in timed relation with a moving image.

b. Adapter's License means the license You apply to Your Copyright and Similar Rights in Your contributions to Adapted Material in accordance with the terms and conditions of this Public License.

c. Copyright and Similar Rights means copyright and/or similar rights closely related to copyright including, without limitation, performance, broadcast, sound recording, and Sui Generis Database Rights, without regard to how the rights are labeled or categorized. For purposes of this Public License, the rights specified in Section 2(b)(1)-(2) are not Copyright and Similar Rights.

d. Effective Technological Measures means those measures that, in the absence of proper authority, may not be circumvented under laws fulfilling obligations under Article 11 of the WIPO Copyright Treaty adopted on December 20, 1996, and/or similar international agreements.

e. Exceptions and Limitations means fair use, fair dealing, and/or any other exception or limitation to Copyright and Similar Rights that applies to Your use of the Licensed Material.

f. Licensed Material means the artistic or literary work, database, or other material to which the Licensor applied this Public License.

g. Licensed Rights means the rights granted to You subject to the terms and conditions of this Public License, which are limited to all Copyright and Similar Rights that apply to Your use of the Licensed Material and that the Licensor has authority to license.

h. Licensor means the individual(s) or entity(ies) granting rights under this Public License.

i. NonCommercial means not primarily intended for or directed towards commercial advantage or monetary compensation. For purposes of this Public License, the exchange of the Licensed Material for other material subject to Copyright and Similar Rights by digital file-sharing or similar means is NonCommercial provided there is no payment of monetary compensation in connection with the exchange.

j. Share means to provide material to the public by any means or process that requires permission under the Licensed Rights, such as reproduction, public display, public performance, distribution, dissemination, communication, or importation, and to make material available to the public including in ways that members of the public may access the material from a place and at a time individually chosen by them.

k. Sui Generis Database Rights means rights other than copyright resulting from Directive 96/9/EC of the European Parliament and of the Council of 11 March 1996 on the legal protection of databases, as amended and/or succeeded, as well as other essentially equivalent rights anywhere in the world.

l. You means the individual or entity exercising the Licensed Rights under this Public License. Your has a corresponding meaning.

Section 2 -- Scope.

a. License grant.

1. Subject to the terms and conditions of this Public License, the Licensor hereby grants You a worldwide, royalty-free, non-sublicensable, non-exclusive, irrevocable license to exercise the Licensed Rights in the Licensed Material to:

a. reproduce and Share the Licensed Material, in whole or in part, for NonCommercial purposes only; and

b. produce, reproduce, and Share Adapted Material for NonCommercial purposes only.

2. Exceptions and Limitations. For the avoidance of doubt, where Exceptions and Limitations apply to Your use, this Public License does not apply, and You do not need to comply with its terms and conditions.

3. Term. The term of this Public License is specified in Section 6(a).

4. Media and formats; technical modifications allowed. The Licensor authorizes You to exercise the Licensed Rights in all media and formats whether now known or hereafter created, and to make technical modifications necessary to do so. The Licensor waives and/or agrees not to assert any right or authority to forbid You from making technical modifications necessary to exercise the Licensed Rights, including technical modifications necessary to circumvent Effective Technological Measures. For purposes of this Public License, simply making modifications authorized by this Section 2(a) (4) never produces Adapted Material.

5. Downstream recipients.

a. Offer from the Licensor -- Licensed Material. Every recipient of the Licensed Material automatically receives an offer from the Licensor to exercise the Licensed Rights under the terms and conditions of this Public License.

b. No downstream restrictions. You may not offer or impose any additional or different terms or conditions on, or apply any Effective Technological Measures to, the Licensed Material if doing so restricts exercise of the Licensed Rights by any recipient of the Licensed Material.

6. No endorsement. Nothing in this Public License constitutes or may be construed as permission to assert or imply that You are, or that Your use of the Licensed Material is, connected with, or sponsored, endorsed, or granted official status by, the Licensor or others designated to receive attribution as provided in Section 3(a)(1)(A)(i).

b. Other rights.

1. Moral rights, such as the right of integrity, are not licensed under this Public License, nor are publicity, privacy, and/or other similar personality rights; however, to the extent possible, the Licensor waives and/or agrees not to assert any such rights held by the Licensor to the limited extent necessary to allow You to exercise the Licensed Rights, but not otherwise.

2. Patent and trademark rights are not licensed under this Public License.

3. To the extent possible, the Licensor waives any right to collect royalties from You for the exercise of the Licensed Rights, whether directly or through a collecting society under any voluntary or waivable statutory or compulsory licensing scheme. In all other cases the Licensor expressly reserves any right to collect such royalties, including when the Licensed Material is used other than for NonCommercial purposes.

Section 3 -- License Conditions.

Your exercise of the Licensed Rights is expressly made subject to the following conditions.

a. Attribution.

1. If You Share the Licensed Material (including in modified form), You must:

a. retain the following if it is supplied by the Licensor with the Licensed Material:

i. identification of the creator(s) of the Licensed Material and any others designated to receive attribution, in any reasonable manner requested by the Licensor (including by pseudonym if designated);

ii. a copyright notice;

iii. a notice that refers to this Public License;

iv. a notice that refers to the disclaimer of warranties;

v. a URI or hyperlink to the Licensed Material to the extent reasonably practicable;

b. indicate if You modified the Licensed Material and retain an indication of any previous modifications; and

c. indicate the Licensed Material is licensed under this Public License, and include the text of, or the URI or hyperlink to, this Public License.

2. You may satisfy the conditions in Section 3(a)(1) in any reasonable manner based on the medium, means, and context in which You Share the Licensed Material. For example, it may be reasonable to satisfy the conditions by providing a URI or hyperlink to a resource that includes the required information.

3. If requested by the Licensor, You must remove any of the information required by Section 3(a)(1)(A) to the extent reasonably practicable.

4. If You Share Adapted Material You produce, the Adapter's License You apply must not prevent recipients of the Adapted Material from complying with this Public License.

Section 4 -- Sui Generis Database Rights.

Where the Licensed Rights include Sui Generis Database Rights that apply to Your use of the Licensed Material:

a. for the avoidance of doubt, Section 2(a)(1) grants You the right to extract, reuse, reproduce, and Share all or a substantial portion of the contents of the database for NonCommercial purposes only;

b. if You include all or a substantial portion of the database contents in a database in which You have Sui Generis Database Rights, then the database in which You have Sui Generis Database Rights (but not its individual contents) is Adapted Material; and

c. You must comply with the conditions in Section 3(a) if You Share all or a substantial portion of the contents of the database.

For the avoidance of doubt, this Section 4 supplements and does not replace Your obligations under this Public License where the Licensed Rights include other Copyright and Similar Rights.

Section 5 -- Disclaimer of Warranties and Limitation of Liability.

a. UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS, ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.

b. TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES, COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR DAMAGES. WHERE A LIMITATION OF LIABILITY IS NOT ALLOWED IN FULL OR IN PART, THIS LIMITATION MAY NOT APPLY TO YOU.

c. The disclaimer of warranties and limitation of liability provided above shall be interpreted in a manner that, to the extent possible, most closely approximates an absolute disclaimer and waiver of all liability.

Section 6 -- Term and Termination.

a. This Public License applies for the term of the Copyright and Similar Rights licensed here. However, if You fail to comply with this Public License, then Your rights under this Public License terminate automatically.

b. Where Your right to use the Licensed Material has terminated under Section 6(a), it reinstates:

1. automatically as of the date the violation is cured, provided it is cured within 30 days of Your discovery of the violation; or

2. upon express reinstatement by the Licensor.

For the avoidance of doubt, this Section 6(b) does not affect any right the Licensor may have to seek remedies for Your violations of this Public License.

c. For the avoidance of doubt, the Licensor may also offer the Licensed Material under separate terms or conditions or stop distributing the Licensed Material at any time; however, doing so will not terminate this Public License.

d. Sections 1, 5, 6, 7, and 8 survive termination of this Public License.

Section 7 -- Other Terms and Conditions.

a. The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.

b. Any arrangements, understandings, or agreements regarding the Licensed Material not stated herein are separate from and independent of the terms and conditions of this Public License.

Section 8 -- Interpretation.

a. For the avoidance of doubt, this Public License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Licensed Material that could lawfully be made without permission under this Public License.

b. To the extent possible, if any provision of this Public License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this Public License without affecting the enforceability of the remaining terms and conditions.

c. No term or condition of this Public License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.

d. Nothing in this Public License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.


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