Abstract：
Snapping of fingers can be caused by pathologies such as stenosing flexor tenosynovitis. However, snapping symptoms in the metacarpophalangeal (MP) joint caused by hypertension and hyperplasia of the lateral band are rare. We present a 26-year-old female with symptoms of painful snapping of the middle finger. When the finger was actively flexed from the hyperextension of the MP joint, the ulnar lateral band was prominent, and a snapping phenomenon occurred. The cause of the snapping finger was considered to be tightness of the ulnar lateral band, and surgery was planned. Intraoperatively, the ulnar lateral band was tense and hyperplastic. The snapping phenomenon disappeared immediately after the resection of the lateral band. It is important to consider this condition as one of the differential diagnoses of snapping finger when the patient complains of an atypical snapping phenomenon.
摘要：
手指折断可由诸如狭窄屈肌腱鞘炎的病理引起。然而,由高血压和外侧带增生引起的掌指关节（MP）咬合症状很少见。我们介绍了一名26岁的女性，其症状是中指疼痛。当手指从MP关节过度伸展时，尺骨外侧带突出,出现了一种折断现象。手指折断的原因被认为是尺骨外侧带紧绷，手术是有计划的.术中,尺骨外侧带紧张，增生。切除侧带后，折断现象立即消失。当患者抱怨非典型的折断现象时，重要的是将这种情况视为折断手指的鉴别诊断之一。
