Procedure

  1. Patient seated with knees flexed 90° hanging over the edge of the examination table
  2. Examiner instructs patient to internally rotate the tibia and extend leg
  3. Examiner then asks the patient to repeat the motion with the tibia externally rotated
  4. During both motions the examiner is palpating the popliteal fossa looking for signs of crepitus or nonuniform motion

Interpretation

Positive Wilson’s Test

Pain, apprehension or joint “locking”: Meniscal lesion, osteochondritis dissecans

Clinical Notes

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)