Complete Intrasubstance Long Head Biceps Brachii Rupture with Successful Repair: A Case Report

Intrasubstance biceps rupture is a rare injury. Closed traumatic biceps rupture is a relatively rare injury, and although an intramuscular tear, appropriate surgical timing and technique can be well treated. We report a case of traumatic abdominal Intrasubstance biceps rupture, mainly repaired by using a modified Mason-Allen (allograft tendon augmentation) technique. After 6-month follow-up, physical strength and good repair, clinical and MRI examination. The DASH score showed 0 out of 100 (no disability). Application of this technique can successfully repair acute traumatic closed biceps cross section, with good postoperative function.