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Related Experiment Video

Updated: Jun 20, 2026

Surgical Retrieval, Isolation and In vitro Expansion of Human Anterior Cruciate Ligament-derived Cells for Tissue Engineering Applications

Surgical Retrieval, Isolation and In vitro Expansion of Human Anterior Cruciate Ligament-derived Cells for Tissue Engineering Applications

Published on: April 30, 2014

Lateral Patellofemoral Ligament Reconstruction With a Hamstring Allograft.

Hailey P Huddleston¹, Navya Dandu¹, Blake M Bodendorfer¹

¹Rush University Medical Center, Chicago, Illinois, USA.

Video Journal of Sports Medicine

|May 1, 2025

Summary

Lateral patellofemoral ligament reconstruction (LPFLR) can effectively treat medial patellar instability after lateral retinacular release. This soft tissue reconstruction improves patient outcomes and knee function when nonoperative measures fail.

Keywords:

LPFL lateral patellofemoral complex lateral patellofemoral ligament reconstruction patellar instability surgical technique

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Published on: March 1, 2024

Area of Science:

Orthopedic surgery
Sports medicine
Knee biomechanics

Background:

Medial patellar instability is a rare complication following lateral retinacular release surgery.
The lateral patellofemoral ligament (LPFL) is crucial for stabilizing the patella against medial and lateral displacement.
Soft tissue reconstruction of the LPFL can potentially restore patellar stability.

Purpose of the Study:

To describe the surgical technique for lateral patellofemoral ligament reconstruction (LPFLR) using a hamstring allograft.
To evaluate the efficacy of LPFLR in patients with patellar instability refractory to nonoperative management.

Main Methods:

Diagnostic arthroscopy to assess the medial patellofemoral ligament, patellar tracking, and chondral status.
A V-shaped hamstring allograft is harvested and tunneled through the quadriceps and patellar tendons and iliotibial band.
Graft fixation with nonabsorbable sutures to achieve optimal resting length and tension, replicating natural patellar eversion.

Main Results:

Case series demonstrated significant improvements in patient-reported outcomes, including pain, Lysholm score, and Knee Injury and Osteoarthritis Outcome Score (KOOS).
Patients reported reduced kinesiophobia (fear of movement) post-surgery.
No recurrent instability events or loss of range of motion were observed at short-term follow-up.

Conclusions:

Lateral patellofemoral ligament reconstruction (LPFLR) is a viable soft tissue option for medial patellar instability post-lateral retinacular release.
Patients with persistent instability despite nonoperative treatment may benefit significantly from LPFLR.
The described technique offers a reliable method for restoring lateral patellofemoral stability.