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The Journal of Bone and Joint Surgery, Vol 65, Issue 1 70-80, Copyright © 1983 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

Flexor tendon healing and restoration of the gliding surface. An ultrastructural study in dogs

RH Gelberman, JS Vande Berg, GN Lundborg and WH Akeson

Healing canine flexor tendons were treated with either total immobilization and were studied by light, scanning, and transmission electron microscopy at ten, twenty-one , and forty-two days. The immobilized tendons healed by ingrowth of connective tissue from the digital sheath and cellular proliferation of the endotenon. The ingrowth of reparative tissue from the digital sheath overwhelmed the epitenon response. At the ultrastructural level, collagen resorption was prominent whereas protein synthesis was limited. This was observed at all study-intervals. In contrast, the mobilized tendons healed by proliferation and migration of cells from the epitenon. Ingrowth of reparative tissue from the tendon sheath was notably lacking in this group. The epitenon cells exhibited greater cellular activity and collagen production at each interval compared with cells of the immobilized repairs.
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