Overuse tendinitis of the intrinsic muscles.

Repetitive strain injuries are currently the leading cause of occupational illnesses. This report describes seven patients who presented with the sole symptom of hand pain and subsequently were diagnosed with intrinsic tendinitis. Six of the 7 patients were given injections of a local anesthetic and steroid solution into the region of the lumbrical tunnels for both diagnostic and therapeutic purposes. All 6 patients had immediate short-term resolution of their symptoms in the office, thereby confirming the diagnosis. Complete resolution of symptoms after both the injection and other treatment interventions occurred in 4 patients, and partial resolution of symptoms occurred in the remaining two patients. Follow-up ranged from 3 to 20 months for 6 patients, and the seventh patient was lost to follow-up. The clinical presentation, diagnostic work-up, and treatment of intrinsic tendinitis are described.