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The Oxford medial unicompartmental knee replacement was designed to reproduce normal mobility and forces in the knee, but its detailed effect on the patellofemoral joint has not been studied previously. We have examined the effect on patellofemoral mechanics of the knee by simultaneously measuring patellofemoral kinematics and forces in 11 cadaver knee specimens in a supine leg-extension rig. Comparison was made between the intact normal knee and sequential unicompartmental and total knee replacement. Following medial mobile-bearing unicompartmental replacement in 11 knees, patellofemoral kinematics and forces did not change significantly from those in the intact knee across any measured parameter. In contrast, following posterior cruciate ligament retaining total knee replacement in eight knees, there were significant changes in patellofemoral movement and forces. The Oxford device appears to produce near-normal patellofemoral mechanics, which may partly explain the low incidence of complications with the extensor mechanism associated with clinical use.

Original publication

DOI

10.1302/0301-620x.88b12.18306

Type

Journal article

Journal

The Journal of bone and joint surgery. British volume

Publication Date

12/2006

Volume

88

Pages

1591 - 1595

Addresses

Nuffield Department of Orthopaedic Surgery, Nuffield Orthopaedic Centre NHS Trust, Windmill Road, Oxford, UK. andrew.price@ndos.ox.ac.uk

Keywords

Femur, Patella, Knee Joint, Humans, Range of Motion, Articular, Arthroplasty, Replacement, Knee, Knee Prosthesis, Recovery of Function, Biomechanics