Deep flexor tendons from the forepaws of rabbits were removed and cut into two segments, sutured and freeze-dried. About one week later each tendon was placed in a knee joint of the same rabbit from which the tendon had been removed. At one, two, three and six weeks the tendons were retrieved and examined grossly, histologically and by electron microscopy. For comparison a control group using non freeze-dried tendons was also studied. Although there was evidence of central necrosis, superficial healing of the freeze-dried tendons occurred and was presumably due to cells from the synovial fluid.
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