Lazaro L
South Med J. 1977 Jan;70(1):36-40.
The term "ulnar nerve instability" describes the chronic conditions of subluxation and relocation of the ulnar nerve at the elbow with flexion and extension of the elbow, respectively. This condition is more common than generally thought. Recurrent subluxation of the nerve at the elbow results in a tractional and frictional neuritis. The nerve is vulnerable to trauma in its subluxed position, lying superficially on the medial humeral epicondyle. In certain cases of ulnar nerve instability associated with a tight overlying band bridging the heads of origin of the flexor carpi ulnaris, nerve injury can occur with flexion of the elbow. Thus, internal as well as external compressive factors as a cause of ulnar nerve neuropathy must be considered. Described is an elbow flexion test helpful in the diagnosis and prognosis of cases of ulnar nerve instability associated with the tight overlying band.
术语“尺神经不稳定”描述了尺神经在肘部随着肘关节屈伸分别出现半脱位和复位的慢性情况。这种情况比一般认为的更为常见。神经在肘部反复半脱位会导致牵张性和摩擦性神经炎。该神经在半脱位位置时容易受到创伤，因为它浅表地位于肱骨内上髁上。在某些与横跨尺侧腕屈肌起点头的紧绷覆盖带相关的尺神经不稳定病例中，肘关节屈曲时可发生神经损伤。因此，必须考虑内部和外部压迫因素作为尺神经神经病变的原因。本文描述了一种有助于诊断和判断与紧绷覆盖带相关的尺神经不稳定病例预后的肘关节屈曲试验。
