1. Patient supine
  2. Examiner externally rotates patient’s leg and flexes the knee to 30°
  3. Examiner places thumb behind the fibular head and applies a valgus force to the knee
  4. Examiner then proceeds to extend the knee while applying forward pressure with the thumb on the fibular head (causing medial rotation of the leg)


Positive Losee’s Test

“Clunk” just before full knee extension is reached:

  • Anterolateral rotational instability
  • Anterior cruciate ligament sprain
  • Lateral collateral ligament sprain
  • Iliotibial band lesion
  • Capsule damage

Clinical notes

Patients with knee instability typically have a history of knee joint injury and/or repetitive stress.