Abstract
Bone-patellar tendon grafts, consisting of the central one-third of the patellar tendon and a small flake of bone from the tibial crest, were harvested bilaterally from six adult female goats. Animals were killed 13 or 52 weeks after surgery. Mediolateral and craniocaudal radiographs of the operated stifle joints demonstrated two distinct patterns of bone response around the graft harvest site. Reactive bone formation, consistent with low-grade osteitis, was seen around the distal pole of the patella. The second lesion involved the progressive development of dystrophic calcification within the patellar and tibial attachments of the patellar tendon (enthesopathy). We hypothesize that enthesophytes develop in response to changes in strain distribution around the extensor mechanism after patellar tendon harvest. These disturbances in strain distribution may lead to secondary patellofemoral joint dysfunction and adversely affect long-term results after anterior cruciate ligament reconstruction in man.
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