The Orthobullets Podcast Recon | Knee Biomechanics
Aug 24, 2025
Dive into the intricate world of knee biomechanics! Discover how the patellofemoral and tibiofemoral joints interact, and the importance of the Q angle. Learn about knee flexion dynamics and essential rehabilitation strategies to prevent injuries. The discussion also highlights intriguing gender differences in knee mechanics, pointing out the unique loading patterns in female athletes and their elevated risk of ACL injuries. This journey through biomechanics is both enlightening and crucial for anyone interested in knee health!
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Patellofemoral Mechanics And Load
- The patellofemoral joint transmits quadriceps tensile forces and increases the extensor lever arm.
- Patellectomy reduces extension force by about 30% and contact force peaks around 45° of flexion.
Protect Medial Restraints To Prevent Lateral Subluxation
- Preserve medial soft tissues to resist lateral patellar subluxation because the MPFL provides ~60% restraint at 20° flexion.
- Also consider dynamic quadriceps balance since muscles provide key dynamic restraint.
Posterior Rollback Enables Deep Flexion
- Tibiofemoral joint transmits body weight with reaction forces up to 4x body weight during climbing.
- Posterior rollback shifts the femoral instant center posteriorly with flexion to allow increased flexion without impingement.