Partial Tear of the Common Flexor Tendon and Medial Ulnar Collateral Ligament in a Six-Year-Old After a Minor Traumatic Injury: A Case Report.

Acute traumatic medial ulnar collateral ligament (MUCL) injury, associated with a high-grade sprain of the common flexor tendon and a low-grade sprain of the annular ligament, is an uncommon occurrence in the non-athletic pediatric demographic. At present, there is a lack of high-quality, evidence-based research that details comparable injuries. Furthermore, to our knowledge, there are no established guidelines that provide direction for the optimal treatment of this specific injury. We report a case involving a six-year-old boy who suffered an acute traumatic MUCL injury to his right elbow. This injury was associated with a high-grade injury to the common flexor tendon, alongside a low-grade sprain of the annular ligament and a minor tear of the ulnar nerve. The patient exhibited persistent pain and a limited range of motion. He received treatment that included a brief period of immobilization, after which he gradually resumed his daily activities without any restrictions. Follow-up visits after one month and three months indicated a complete resolution of pain and a full recovery of the elbow's range of motion.