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矢状束断裂(拳击手指)

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A knuckle injury where the tendon slips off the top of the joint — the "boxer's knuckle" — and how early splinting or surgery treats it.

握紧拳头的背部示意图,疼痛突出显示在伸肌腱滑脱的指关节处。
矢状束断裂(“拳击手指”):位于指关节中央、固定伸肌腱的矢状束发生撕裂,导致伸肌腱向一侧滑脱。 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。

您的感受

您手指基部(最常见于中指)的掌指关节感到酸痛、轻微肿胀,且活动异常。典型症状是屈伸手指时,掌指关节背侧的肌腱出现弹响或向侧方跳跃。您可能注意到手指轻微向小指侧偏移,且从弯曲位置自行伸直困难,但若他人轻柔地将其伸直后,手指可维持在该位置。

许多人首次出现此症状是在出拳后(击打沙袋、墙壁或与人搏斗),因此该损伤被称为“拳击手指”。但也可能由较小的动作引发,如用力快速伸直手指,或在患有炎症性关节炎的人群中逐渐发生。每次使用手部时,可能会出现疼痛性弹响或卡顿。

实际发生了什么

在每个指关节的背面,伸直肌腱像缆绳一样沿着手指中心下行,处于一个沟槽中。称为矢状束的薄层组织位于肌腱两侧,将该肌腱固定在指关节顶部的中央位置。其中靠近拇指侧的束带更为重要。

当该束带撕裂或松弛(由拳击、突然的强力运动或长期存在的关节炎症引起)时,肌腱不再被固定,会从指关节顶部滑脱,进入骨骼之间的凹陷处,朝向小指侧。由于肌腱现在位于侧面而非顶部,它无法从完全弯曲的位置有效地将手指拉直,并且在手指活动时来回弹跳。这种滑动、弹跳以及伸直无力的现象,就是该问题的核心所在。

我们能采取的措施

好消息是,如果早期发现,这通常无需手术即可愈合。 关键在于在夹板(自身)修复期间阻止肌腱滑脱。

夹板固定(非手术治疗)。 最常见的治疗方式是使用一个小型定制夹板,限制受伤指关节过度弯曲,同时允许其他手指以及更远端的指关节正常活动。一种简便的变体,有时称为相对运动夹板或“Y形”夹板,仅将受伤手指保持在略高于相邻手指的位置,从而在使用手部时使肌腱保持居中。夹板通常需佩戴约六至八周。若在受伤后最初几周内开始使用,该方法对大多数患者效果良好。

手术治疗。 如果就诊时损伤已为陈旧性,或夹板固定未能使其复位,或肌腱完全脱位,则可通过手术进行矫正。外科医生可直接修复撕裂的夹板,或利用邻近的一条肌腱条重建夹板,使肌腱在指关节上方重新居中。术后,手指需在夹板保护下一段时间直至愈合。

预期情况

对于早期损伤并通过夹板治疗的患者,预后良好:弹响症状会消退,手指可再次正常伸直,大多数人能够恢复手部的全部功能。这需要耐心:夹板需佩戴数周,若过早对手部施加过大压力,可能导致肌腱在夹板尚未愈合前再次滑脱。

对于需要手术治疗的损伤(通常是较陈旧或较严重的病例),修复或重建手术通常能有效防止脱位并恢复平滑的活动,随后需进行夹板固定和手部康复治疗,以重建活动度和力量。拳击手、武术家及其他运动员通常可以重返赛场,但手部需先充分愈合,以避免问题立即复发。

何时就医

  • 弯曲和伸直手指时,指关节出现弹响、咔哒声或卡顿,尤其是在出拳或剧烈运动后:应尽早检查,因为早期夹板固定是关键。
  • 无法自行从弯曲位置伸直手指,或手指向小指侧偏移。
  • 指关节持续疼痛和肿胀,且未缓解,或有肌腱“错位”的感觉。
  • 拳击手或武术运动员的指关节损伤:这类损伤容易被忽视,且早期治疗预后更好。

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