Extrinsic Cell Infiltration and Revascularization Accelerate Mechanical Deterioration of the Patellar Tendon After Fibroblast Necrosis

[+] Author and Article Information
Harukazu Tohyama, Kazunori Yasuda

Division of Medical Bioengineering and Sports Medicine, Department of Advanced Surgery, Hokkaido University School of Medicine, Kita-15 Nishi-7, Sapporo 060-8638, Japan

J Biomech Eng 122(6), 594-599 (Jul 24, 2000) (6 pages) doi:10.1115/1.1319659 History: Received October 28, 1999; Revised July 24, 2000
Copyright © 2000 by ASME
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Grahic Jump Location
Illustration showing the wrapping technique for the patellar tendon. Two nylon membrane filters were inserted between the patellar tendon and fat pad. The patellar tendon was then doubly wrapped in these filters. The inner filter was tightly sutured beside the medial edge of the patellar tendon using 3-0 monofilament nylon threads (A). The outer filter was sutured at the lateral edge of the patellar tendon. These filters covered not only the patellar tendon but also the distal third of the patella and a part of the tibial tuberosity (B).
Grahic Jump Location
Histological representation of longitudinal sections of the patellar tendon with the top of each photograph corresponding to the anterior side of the tendon. Stained with hematoxylin and eosin. (A) There was uniform cellularity. Nuclei of most cells were spindle-shaped in the normal control tendon (bar=200 μm). (B) No cells are seen in the midsubstance of the tendon in Group I at 6 weeks (bar=200 μm). (C) Some vessels were observed at the peripheral portions of the tendon of Group II at 3 weeks (bar=400 μm). (D) Many cells with an ovoid nucleus were dispersed in the patellar tendon matrix of Group II at 6 weeks (bar=200 μm). (E) Several vascular sections were observed at the midsubstance in Group II at 6 weeks (bar=400 μm). (F) There is uniform cellularity in the tendon in Group III at 6 weeks and the nuclei of most cells are spindle-shaped (bar=200 μm).




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