Relationships among bone mineral densities, static alignment and dynamic load in patients with medial compartment knee osteoarthritis

Objective. To investigate the relationships among bone mineral density (BMD ), static alignment and the adduction moment of the knee in patients with t ibiofemoral osteoarthritis (OA). Methods. Sixty-nine patients with medial compartment knee OA underwent radi ographic evaluation, gait analysis and BMD measurements at the proximal tib ia and lumbar spine. Results. The bone mineral distribution of the medial to lateral part of the proximal tibia correlated significantly with the peak knee adduction momen t and the mechanical axis. Furthermore, the adduction moment correlated sig nificantly with the mechanical axis. However, the BMD of the lumbar spine a nd the bone mineral distribution of the posterior to anterior part of the p roximal tibia did not correlate with any other measurement. Conclusions. Our results suggest that the bone mineral distribution of the proximal tibia is directly affected but lumbar BMD is not influenced by the local mechanical stress around the knee with medial compartment OA.