1. This case is presented to illustrate two etiological factors in tendon rupture occurring in one patient.

2. The rupture of the long head of the biceps brachii muscle appears to have been of acute traumatic origin.

3. Bilateral simultaneous rupture of the calcaneal tendons is rare, but it seems probable that the cortico-steroid therapy was the etiological factor in this case.

4. It has been suggested that degeneration in the tendon is caused by ischaemia, secondary to hypertrophy of the tunica media and narrowing of the medium calibre blood vessels. Betamethazone could possibly have aggravated, or may even have caused these changes, and the periarteriolar changes found in the biopsy specimen would tend to support this theory.