1. Fourteen patients whose Kienböck's disease was treated by prosthetic replacement, and who have had an acrylic lunate prosthesis in place for periods of eight to twenty years, have been reviewed.

2. In most patients pain, weakness and limitation of movement are less than they were before operation. Four wrists are completely painless and the other ten have only occasional slight pain. The average range of antero-posterior movement is 100 degrees.

3. Radiological signs of osteoarthritis are either absent or slight in ten wrists: this is considered to be due to the success of the prosthesis in maintaining the carpal architecture, even after prolonged heavy use.

1. Two patients with multicentric extra-abdominal desmoid tumours are reported. Multicentric foci have not been described previously.

2. Both cases conform to the usual clinical, macroscopic and microscopic criteria of desmoid tumours in all other regards.

3. Their occurrence in a single limb bud suggests a congenital propensity and leads to the advocacy of radical surgery in such cases.