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Unstable osteochondral or internal high T2 signal about or within osteochondral lesion.
T umors that ynovial sarcomas (16%). Desmoid tumors. Giant cell tumors of tendon sheath.
S have a predilection for the foot and ankle
Unicameral bone cyst. Epiphyseal equivalent: Giant cell tumor. Chondroblastoma. Infection.
Differential diagnosis for calcaneal tumors
Most common accessory muscles encountered around foot and ankle.
Accessory soleus. Accessory peroneus quartus muscles.
Fibular ankle ligaments
Superior group: Anterior and Posterior tibiofibular ligaments. Inferior group: Anterior and Posterior talofibular ligaments. Calcaneofibular ligament.
Chronic lateral ankle instability. Sinus tarsi syndrome. Anterolateral impingement syndrome.
Conditions with high association with chronic tears of the lateral ankle ligaments
Sinus tarsi T orn ligaments of sinus tarsi. Results in subtalar instability. Granulation tissue (high T2, low T1) or scar (low T2, low T1) replaces normal fat (high T1) of sinus tarsi.
Synovial hypertrophy or scarring in lateral ankle gutter. Space between tibia and fibula bound by lateral ankle ligaments. Lateral ankle pain and inability to dorsiflex normally.
Anterolateral impingement syndrome
2 most common tarsal coalitions Middle facet of talocalcaneal joint.
Discoid meniscusmeniscus: Lens-shaped, wedged, flat and others. Lateral meniscus (3% population) more commonly involved than medial. More prone to tear. Can be symptomatic even without a tear.
Ligament running through Hoffa's fat-pad connecting both meniscal anterior horns. May mimic an anterior horn lateral mensicus tear.
Transverse knee ligament
Extends obliquely from medial femoral condyle to posterior horn lateral meniscus. Ligament of Humphry (passes in front of PCL). Ligament of Wrisberg (passes behind PCL).
Lateral collateral ligament (LCL) of the knee consists of threeFibular posterior to anterior:
Biceps femoris tendon inserts onto head of fibula. parts, collateral ligament (true lateral collateral ligament) extends from lateral femoral condyle and joint biceps femoris tendon to insert on head of fibula. Iliotibial band extends from fascia to blend into lateral retinaculum on the patella and inserts at Gerdy's tubercle of lateral tibia.
Rarely medial patella plica may thicken and cause symptoms similar to a torn meniscus. Can be removed arthroscopically quite easily.
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This document was uploaded on 01/14/2014.
- Winter '14