Patella Stabilization NYC — MPFL Reconstruction & Patellar Instability Treatment

Introduction

A structural patellar dislocation occurs when the kneecap is forced entirely out of its anatomical groove on the femur, almost always displacing to the lateral side of the knee joint. The medial patellofemoral ligament (MPFL) serves as the primary passive mechanical restraint that checkmates this lateral displacement. Consequently, the MPFL is torn or severely attenuated in virtually every first-time traumatic patellar dislocation event. Once structurally compromised, the MPFL cannot reliably heal back to its native functional length or tension. This chronic laxity explains why the re-dislocation rate among young active patients approaches 30% to 50% without surgical intervention. [2]

Modern management of patellar instability requires a precise evaluation to identify the specific anatomical factors driving the joint failure. While most patients present with MPFL insufficiency as the primary driver, others possess structural bony anomalies—such as severe trochlear dysplasia (an abnormally shallow femoral groove that fails to contain the kneecap) or an elevated tibial tubercle offset—that must be addressed concurrently to prevent graft failure.

Surgical Patella Stabilization Tracks at New York Bone & Joint

MPFL Reconstruction

Medial patellofemoral ligament (MPFL) reconstruction biologically rebuilds the primary soft tissue checkrein on the inside of the knee. This is typically performed arthroscopically or through a minimal incision using a gracilis tendon autograft harvested from the patient’s own hamstring. [4] The graft tissue is securely anchored to the medial aspect of the patella and tunneled beneath the tissue layers to the exact, isometric femoral insertion point located on the medial femoral condyle. By restoring this missing passive tension, the surgery successfully counteracts lateral patellar displacement and significantly drops the risk of progressive joint subluxation. In cases where joint surface cartilage has been damaged during a displacement, this can be addressed concurrently via a targeted cartilage repair procedure.

Tibial Tubercle Osteotomy (TTT)

When the tibial tubercle—the bony prominent area on the shinbone where the patellar tendon attaches—is positioned too far toward the outside of the leg, it creates an abnormal physical pull. This lateral offset is quantified via specialized CT imaging to calculate the Tibial Tubercle-Trochlear Groove (TT-TG) distance. [3] An elevated TT-TG distance means that the quadriceps muscle acts like a bowstring, pulling the kneecap laterally out of its track with every single muscle contraction. In these scenarios, executing an isolated MPFL soft tissue repair is insufficient because the intense underlying bony pull will simply stretch out the new graft over time. A tibial tubercle osteotomy resolves this by precision-cutting the bone plug of the tubercle and shifting it medially (inward) and/or anteriorly (forward) to normalize tracking dynamics. The bone is then rigidly locked into place with compression surgical screws.

Lateral Retinacular Release: An Honest Approach

Cutting the lateral retinaculum (the tight tissues on the outside of the kneecap) to treat generalized instability is one of the most overutilized and ineffective methods in modern knee surgery. Published clinical data has consistently proved that utilizing a lateral release as a standalone treatment for recurrent patellar dislocations yields uniformly poor long-term outcomes. [5] Cutting the lateral structures does nothing to restore the missing medial checkrein that caused the initial structural failure. At New York Bone & Joint Specialists, a lateral release is never used as a standalone or primary treatment track. It is reserved strictly as an intraoperative adjunct in highly specific anatomic configurations where exceptionally tight lateral structures are visibly tilting the patella outward despite a balanced medial reconstruction.

Comprehensive Surgical Comparison Matrix

References

1. AAOS. Unstable Kneecap. OrthoInfo. orthoinfo.aaos.org/en/diseases–conditions/unstable-kneecap
2. Smith TO et al. Surgical versus non-surgical interventions for treating patellar dislocation. Cochrane Database Syst Rev. 2023. pubmed.ncbi.nlm.nih.gov/36692346
3. Dejour H et al. Factors of patellar instability: an anatomic radiographic study. Knee Surg Sports Traumatol Arthrosc. 1994. pubmed.ncbi.nlm.nih.gov/7584171
4. Chouteau J. Surgical reconstruction of the medial patellofemoral ligament. Orthop Traumatol Surg Res. 2016. pubmed.ncbi.nlm.nih.gov/26797001
5. Nha KW et al. Arthroscopy-controlled medial reefing and lateral release for recurrent patellar dislocation. BMC Musculoskelet Disord. 2021. pubmed.ncbi.nlm.nih.gov/33971864