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掌骨骨折(包括拳击手骨折)

A broken hand bone in the palm — including the common boxer's fracture — how it is treated, the rotation check that matters most, and recovery.

拳击手用紧握的拳头击打速度球。
掌骨骨折——包括小指指关节常见的“拳击手骨折”——通常继发于拳击或手部直接撞击。 Kieran Hirpara 4.0

本页面由机器翻译,尚未经临床医生审核。英文版本为权威版本。

您正在感受到的症状

掌骨骨折是指手部掌骨(连接手腕与手指的长骨,即您能触摸到的指关节处骨骼)中的一根发生断裂。最常见的类型发生在拳击之后,累及小指指关节后方的骨骼。这种情况极为常见,以至于有一个俗称:拳击手骨折。

通常会有一个明显的受伤时刻:向坚硬物体出拳、跌倒时手掌着地,或遭受挤压或扭伤。受伤后,手背立即出现疼痛、肿胀和瘀伤,与对侧相比,指关节可能显得扁平或“凹陷”。握拳时疼痛,且抓握力感觉减弱。有些人会注意到,当尝试将手握成拳头时,某根手指似乎交叉或指向相邻的手指;这种扭转至关重要,是我们检查的主要事项之一。

实际发生了什么

您有五根掌骨,每根分别延伸至一根手指和拇指。骨折可能发生在颈部(紧邻指关节后方,即典型的拳击手骨折部位)、骨干(骨的中段)或基底(靠近手腕处)。骨折后,断端可能形成角度、缩短或扭转。

一定程度的角度通常是可以接受的,因为手部具有较强的代偿能力,尤其是环指和小指的掌骨,能够耐受相当程度的弯曲而不引起实际问题,因为这些指关节天生活动度更大。手部难以耐受的是扭转(我们称之为旋转)。即使骨折处存在少量旋转,也会导致握拳时该手指向相邻手指偏斜,使得手指无法整齐并拢。因此,您握拳时手的外观比单独的X线角度更能反映情况。

我们能做什么

Kieran Hirpara 医生是 Mater Private Hospital Rockhampton 的上肢外科医生,负责指导您的护理,从初次评估一直持续到康复阶段。患者通常由其全科医生(GP)转诊至我们的诊所;如果物理治疗师建议您就诊,您仍需获得全科医生的转诊才能符合 Medicare 报销资格,随后我们将确认诊断并选择适合您需求的方案。

好消息是,大多数掌骨骨折无需手术即可良好愈合。

对于大多数病例(包括大多数拳击手骨折),答案很简单: 支撑和早期活动。根据骨折情况,我们可能会使用轻质夹板、石膏,或仅将受伤的手指与相邻手指进行邻指固定(buddy-strapping),然后鼓励您尽早开始轻柔地活动手部。早期活动是有意为之的:它可以防止手部僵硬,且研究表明,对于典型的拳击手骨折,简单的固定配合早期活动与较重的石膏固定效果相当 [4, 5]。

手术仅保留给那些若不干预则预后不佳的骨折。手术的主要指征包括:旋转(扭转)的手指、角度严重异常或短缩的骨骼、多根掌骨同时骨折、累及关节的骨折,或骨折处有开放性伤口。当我们进行固定时,选项包括经皮置入的小钢丝(K-wires),或通过切口置入的小钢板和螺钉。许多此类手术可在患者完全清醒的状态下进行,通过局部麻醉使手部麻木,同时您保持清醒且舒适,这使我们能够在手术台上请您活动手指,并在结束手术前确认旋转已得到纠正。

预期情况

大多数掌骨骨折在四至六周左右愈合,手部很快即可恢复大部分正常活动。即使骨骼愈合时伴有轻微弯曲,指关节可能看起来不如以前突出,但手部通常能完全正常运作。

无论是否接受手术,保护治疗效果的关键在于术后的手部活动:轻柔、早期进行,并在必要时由手部治疗师指导。我们重点关注的并发症包括僵硬(最常见)、残余扭转或弯曲(畸形愈合),以及偶尔出现的指骨完全伸直功能轻微受限。通过早期活动预防僵硬远比后期治疗更容易,因此我们建议您尽早开始活动,而非拖延。

何时就医

  • 任何畸形,或握拳时手指越过相邻手指:这种扭转需要尽快评估,因为它是矫正或固定骨骼的关键原因。
  • 指关节处皮肤上的伤口或破损,尤其是在出拳击中他人嘴部之后:牙齿可能引入严重感染,这需要紧急医疗处理。
  • 剧烈疼痛、明显肿胀、麻木,或手指看起来苍白或暗红:请毫不拖延地接受复查。
  • 受伤后数周内手部变得僵硬而非更灵活:早期手部治疗能带来实质性差异。

深入探讨

Advanced reading: the deeper science (optional)

本节内容超出了您做出自身治疗决策所需的深度。掌骨骨折值得额外阅读,因为其中大多数根本无需手术,且最令患者担忧的畸形——即变平的指关节——恰恰是手部耐受性最好的畸形。

为何成角畸形可被耐受,且在不同手指间存在差异

掌骨颈骨折通常会导致掌骨头向掌侧倾斜,从而使指关节失去其原有的隆起。这种外观显得异常,容易被误判为需要矫正。

决定其临床意义的关键在于腕端相应关节的储备活动度。食指和中指的掌骨基底实际上处于固定状态,因此该处的成角畸形难以得到代偿。无名指和小指的掌骨则位于活动度较大的关节上,允许相当大的旋转,从而能够吸收相当程度的成角畸形而不造成功能丧失。

正因如此,小指掌骨的拳击手骨折(最常见的一种)比相隔两根手指的相同损伤能耐受更多的成角畸形,且该处外观显著的畸形通常无需手术即可处理。

旋转畸形才是真正重要的畸形

旋转畸形是例外情况,值得深入理解,因为它在X线片上容易被漏诊。掌骨若以扭转状态愈合,会导致手指在握拳时越过相邻手指——即出现剪刀样畸形,这会真正损害抓握功能,且不会随时间推移而代偿。

评估旋转畸形的方法是让患者握拳,观察指甲是否对齐以及手指是否呈汇聚状指向,而非通过测量X线片来评估。若骨折在X线片上角度可接受,但查体可见剪刀样畸形,则需予以矫正;反之则通常无需处理。

在采用固定术的情况下,证据较为有限

对于确实需要手术的骨折,髓内螺钉固定术(即从指关节沿骨干置入螺钉)因其避免了在伸肌腱下方放置钢板而日益普及。一项回顾性研究纳入了1,014例患者,结果显示掌骨骨折髓内螺钉固定术后的并发症相对少见 [1]。

与该技术的高普及度相比,其对比性证据较弱。一项早期针对502例患者的综述得出结论:髓内固定术可能在某些掌骨骨折的治疗中发挥作用,但基于现有研究无法得出明确的推荐意见 [2]。

上述两种说法可以同时成立:该技术是安全的,且尚未被证明具有优越性。鉴于此类骨折中的大多数在不进行手术的情况下预后良好,更具决定意义的决策仍然是是否进行手术,而非选择何种内固定物。

畸形愈合可纠正,这改变了决策考量

若骨折愈合位置不佳并导致真正的功能障碍,可采用矫形截骨术。矫形截骨术几乎总能顺利愈合,大多数患者表现为畸形改善或矫正以及手指活动度提升——尽管综述指出,许多患者尽管有所改善,仍保留一定程度的活动受限 [3]。

对于临界病例,这是支持非手术治疗的合理论据。现在进行手术的替代方案并非“接受任何结果”,而是“在最终被证明需要手术的那部分人数较少的群体中,择期进行手术”,且该手术愈合可靠。

参考文献

[1] Anene CC, Thomas TL, Matzon JL, Jones CM. 掌骨骨折髓内螺钉固定后的并发症:系统综述。J Hand Surg Am. 2024;49(10):1043.e1-1043.e16. https://doi.org/10.1016/j.jhsa.2023.01.012

[2] Corkum JP, Davison PG, Lalonde DH. 掌骨骨折髓内固定最佳证据的系统综述。Hand (N Y). 2013;8(3):253-60. https://doi.org/10.1007/s11552-013-9531-8

[3] Freeland AE, Lindley SG. 指掌骨和指骨的畸形愈合。Hand Clin. 2006;22(3):341-55. https://doi.org/10.1016/j.hcl.2006.03.001

[4] van Aaken J, Fusetti C, Luchina S, Brunetti S, Beaulieu JY, Gayet-Ageron A, et al. 采用软包裹/邻指胶带固定与复位石膏固定治疗第五掌骨颈骨折:一项前瞻性、多中心随机试验的结果。Arch Orthop Trauma Surg. 2015;136(1):135-42. https://doi.org/10.1007/s00402-015-2361-0

[5] Poolman RW, Goslings JC, Lee J, Statius Muller M, Steller EP, Struijs PA. 闭合性第五(小指)掌骨颈骨折的保守治疗。Cochrane Database Syst Rev. 2005;(3):CD003210. https://doi.org/10.1002/14651858.cd003210.pub3


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