What are the components of the posteromedial corner.
There are five components of the posteromedial corner. These include: 1. The posterior oblique ligament (POL). 2. The oblique popliteal ligament. 3. The meniscocapsular junction. 4. The semimembranosus tendon. 5. Medical collateral ligament.
What is the anatomy of the posterior oblique ligament?
The posterior oblique ligament attaches to the adductor tubercle superiorly and posterior to the MCL. Distally it has three components: 1. The central or tibial component is the thickest and attaches to the posterior horn of the medial meniscus. 2. The superior or capsular component is continuous with the capsule and oblique popliteal ligament. It lies deep to the medial head of the gastrocnemius. 3. The distal or superficial component is seen deep to the semimembranosus. It is a primary stabiliser of the knee in hyperextension.
Full thickness tear of the superior attachment of the posterior oblique ligament as it inserts on to the adductor tubercle. Partial thickness tear of the adductor tendon as it inserts on to the adductor tubercle. MCL deep fibers are ruptured. MCL attachment to the medial knee capsule is also torn (grade 2 MCL injury). Partial thickness tear of the medial gastrocnemius muscle attachment to the medial femoral condyle. Semimembranosus tendon, posterior capsule, menisco-capsular junction and oblique popliteal ligament components of the posteromedial corner are intact. There is a ruptured popliteal cyst (Baker's cyst). Medial meniscus is intact. No evidence of a reverse Segond fracture.
There is an ACL sprain.
Hyperextension pivot shift type bone marrow contusion pattern in the lateral compartment. Incidental parameniscal cyst arising from the anterior horn of the lateral meniscus. Chronic changes at the tibial tuberosity consistent with previous Osgood-Schlatter syndrome. The lateral meniscus anterior horn shows a chronic multiloculated parameniscal cyst.