Musculocutaneous Nerve Entrapment after Biceps Long Head Tendon Rupture

Biceps long head tendon rupture is relatively common and requires approximately four weeks of splintage as a general treatment. Musculocutaneous nerve entrapment is commonly caused by excessive exercise or direct external force. Musculocutaneous nerve syndrome has barely been reported; however, association of biceps long head tendon rupture and musculocutaneous nerve entrapment syndrome has never been reported. The authors experienced a 70-year-old male patient, who suffered a traffic accident and was hospitalized due to shoulder joint pain caused by direct external force, delayed forearm lateral aspect hypoesthesia and elbow flexion weakness. For identification of the cause, magnetic resonance imaging, electromyography, and surgical opinion were synthesized, resulting in diagnosis of delayed musculocutaneous nerve entrapment syndrome occurring after biceps long head tendon rupture. With surgical treatment, pain, sense, and elbow flexion weakness were recovered, a showing successful treatment result.