Institute for Hand and Arm Surgery, Madison, NJ, USA.
Hand (N Y). 2023 Jan;18(1):NP1-NP4. doi: 10.1177/15589447221081876. Epub 2022 Mar 30.
The most common cause for catching or snapping in the finger is stenosing tenosynovitis, that is, trigger finger. Although less common, snapping can also occur as a result of extensor mechanism injury. Among these injuries, sagittal band rupture is most common and leads to snapping at the metacarpophalangeal joint. Snapping at the proximal interphalangeal (PIP) joint is rare with only 4 reported cases; reported mechanisms of PIP joint snapping include retinacular ligament injury or tendon impingement. We present a unique case of painful finger snapping at the PIP joint as a result of longitudinal tear of the central slip, leading to sudden subluxation of one-half of the central slip and conjoint lateral band with flexion of the PIP joint.
手指被卡或弹响最常见的原因是狭窄性腱鞘炎，也就是扳机指。虽然不太常见，但弹响也可能是由于伸肌机制损伤引起的。在这些损伤中，掌侧副韧带最常见，导致掌指关节弹响。近节指间关节（PIP）弹响很少见，只有 4 例报道；报道的 PIP 关节弹响机制包括支持带韧带损伤或肌腱嵌压。我们报告了一例独特的 PIP 关节疼痛性弹响病例，其病因是中央束的纵向撕裂，导致中央束的一半和联合侧副韧带突然半脱位，并伴 PIP 关节屈曲。
