2021 Annual Meeting Knee Access Pass-MPFL length change patterns in asymptomatic knees of patients with contralateral patellar instability

MPFL length change patterns in asymptomatic knees of patients with contralateral patellar instability

Video Transcription

Video Summary

This study investigated medial patellofemoral ligament (MPFL) length changes during knee flexion in asymptomatic knees of patients with contralateral patellar instability and morphologic risk factors such as trochlear dysplasia, patella alta, and tibial tuberosity lateralization. Dynamic CT scans showed that MPFL length was greatest at full extension (0°) and decreased by up to 15.5% by 50° flexion. Knees with multiple morphologic risk factors exhibited significantly greater anisometry, with length changes up to 22.6 mm, challenging previous assumptions of MPFL isometry. Findings suggest these anatomical variations affect MPFL biomechanics, impacting graft placement and reconstruction techniques in surgery.

Asset Caption

Dr. Miho Tanaka

Keywords

medial patellofemoral ligament

MPFL length changes

knee flexion

patellar instability

morphologic risk factors