The lateral quadriceps expansion is the contribution of the vastus lateralis and the iliotibial band to the extensor mechanism lateral retinaculum. It runs from the lateral margin of the quadriceps tendon, the lateral patella, and the lateral patellar retinaculum to insert onto the lateral tibial tubercle and Gerdy's tubercle. Together with the lateral patellofemoral ligament (LPFL), it is the primary lateral patellar restraint.
| Location | Lateral side of the front of the knee, beside the patella |
|---|---|
| Boundaries |
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Balances the medial restraints of the patella; when too tight it tilts the patella laterally and causes lateral knee pain.
The lateral quadriceps expansion and retinaculum become excessively tight in patellofemoral pain syndrome and lateral patellar maltracking. Lateral release (arthroscopic or open division of the lateral retinaculum and expansion) reduces lateral patellar tilt and lateral compression syndrome. However, over-aggressive lateral release produces medial instability by removing excessive lateral restraint. Modern management favours combined lateral release with medial-sided tightening (medialisation osteotomy or MPFL reconstruction) rather than isolated lateral release. The Kaplan fibers of the IT band are part of this expansion.
Excessive tightness of the lateral quadriceps expansion and retinaculum tilts the patella laterally and compresses the lateral patellofemoral joint, producing anterior knee pain and lateral patellar tilt on axial radiograph; arthroscopic lateral release of the expansion relieves lateral compression but must be combined with medial reconstruction to prevent iatrogenic medial instability.
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