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The effect of harvesting the central one-third of the patellar tendon on patellofemoral contact pressure

The Department of Orthopaedic Surgery, Mount Carmel Medical Center, Columbus, Ohio

Joseph Thomas, MD

The Department of Orthopaedic Surgery, Mount Carmel Medical Center, Columbus, Ohio

David Marsalka, MD

The Department of Orthopaedic Surgery, Mount Carmel Medical Center, Columbus, Ohio

This study assessed whether removing the central one- third of the patellar tendon, with or without side-to-side repair of the patellar tendon defect, would alter patel lofemoral pressure. Patellofemoral pressure was as sessed by testing five stable knees from five different cadaveric donors on a specially designed hydraulic knee machine. Patellofemoral joint pressures were measured by placing pressure-sensitive film into the patellofemoral articulation. The joint was loaded in a static fashion, with quadriceps forces consistent with walking (647 N) and stair climbing (1923 N), at 30°, 60°, and 90° of knee flexion. Using the same knees, the central one-third of the patellar tendon was then sectioned, and patellofemoral joint pressure measure ments were repeated at identical knee flexion angles and quadriceps forces. Side-to-side repair of the patel lar tendon defect was performed and patellofemoral joint pressure measurements were repeated.

There were no statistically significant differences be tween the control and sectioned values or between the control and repaired defect values. These results sug gest that harvesting the central one-third of the patellar tendon—with or without side-to-side repair of the pa tellar tendon defect—does not alter patellofemoral pressures.

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