On the origin of osteochondral exostoses at the end of the bone stump

Abstract

To study the features of the formation of osteochondral exostoses on the lateral surface of the amputation stump of the bone. There were 8 series of experiments performed on 116 dogs, which had the amputation of the thigh with the subsequent plasty by myodesis, myodesis with different degrees of muscle tension, osteoplasty, fascio- and myoplasty, as well as myodesis, which in the postoperative period was accompanied by the electrical stimulation of the muscles. The observation periods included – 1, 3, 8 months. In the postoperative period the muscle tone of all animals was daily measured. The method of investigation was histological with filling of the vessels with ink-gelatin mixture. Totally 36 exostoses were studied. The vast majority of them arose after fascio- and myoplastic amputation and myodesis with the excessive muscle tension. The causes of the appearance of exostoses were the excessive tension of the muscles created during the plastic surgery, and their contracture contractions in the postoperative period. There was a resorption of the cortical diaphyseal plate along the inner and outer surfaces, intraosseous circulation and reparative osteogenesis were disrupted.