Struck by car 2 weeks ago, right hand x-rays last week, finger splint today installed in hand clinic to be worn for 6 weeks, 24 hours per day. Fourth distal interphalangeal joint noted to be in hyperflexion on all views consistent with a mallet deformity, implying extensor tendon insertion avulsion. No associated fracture detected. discomfort is on left side rather than right, just problems typing the letter O. (St. Michael's Hospital, Queen Street East, Toronto, Ontario) 20220222