This cadaveric biomechanical study used optoelectronic motion capture on 9 knees to quantify how each medial patellar ligament contributes to 3D patellar tracking. Structures were sequentially sectioned — VMO junction, then MPFL, then MPML/MPTL — to isolate each structure's contribution across the full flexion arc.
MPFL reconstruction has become the dominant surgical treatment for recurrent lateral patellar instability, replacing older distal realignment procedures that produced good results in only 60–70% of patients at 10 years.
This study quantifies exactly why the MPFL matters: it provides the majority of soft tissue restraint precisely when the patella is most vulnerable, before trochlear bony capture occurs in the first 30° of flexion.
When tensioning your MPFL graft intraoperatively, set the balance at 20–30° of flexion — that is the mechanically relevant arc this paper identifies, and overtightening at higher flexion angles will not replicate native anatomy.
For patients with recurrent instability despite MPFL repair, consider that the MPML and MPTL contribute up to 46% of anti-shift resistance and 72% of tilt control at deeper flexion angles. Combined ligament reconstruction techniques address this.
This cadaveric biomechanical study used optoelectronic motion capture on 9 knees to quantify how each medial patellar ligament contributes to 3D patellar tracking. Structures were sequentially sectioned — VMO junction, then MPFL, then MPML/MPTL — to isolate each structure's contribution across the full flexion arc.
MPFL reconstruction has become the dominant surgical treatment for recurrent lateral patellar instability, replacing older distal realignment procedures that produced good results in only 60–70% of patients at 10 years.
This study quantifies exactly why the MPFL matters: it provides the majority of soft tissue restraint precisely when the patella is most vulnerable, before trochlear bony capture occurs in the first 30° of flexion.
When tensioning your MPFL graft intraoperatively, set the balance at 20–30° of flexion — that is the mechanically relevant arc this paper identifies, and overtightening at higher flexion angles will not replicate native anatomy.
For patients with recurrent instability despite MPFL repair, consider that the MPML and MPTL contribute up to 46% of anti-shift resistance and 72% of tilt control at deeper flexion angles. Combined ligament reconstruction techniques address this.