- Patient seated with knees flexed 90° hanging over the edge of the examination table
- Examiner instructs patient to internally rotate the tibia and extend leg
- Examiner then asks the patient to repeat the motion with the tibia externally rotated
- During both motions the examiner is palpating the popliteal fossa looking for signs of crepitus or nonuniform motion
Positive Wilson’s Test
Pain, apprehension or joint “locking”: Meniscal lesion, osteochondritis dissecans
Common locations for osteochondritis dissecans at the knee (in order of frequency); 75% lateral side of the medial femoral condyles, 10% tip of the medial femoral condyles, 10% lateral femoral condyles, 5% patella.
Osteochondritis dissecans may also occur at other joints (trochlea of the talus, capitulum of the humerus)