Anderson Medial-Lateral Grind is an orthopaedic knee examination to assess the integrity of the meniscus and collateral ligaments. It can also indicate degenerative joint disease or internal derangement of the knee joint. The test provides a dynamic range in which to test knee joint stability and meniscal integrity


  1. Patient supine with hip flexed 90° and knee flexed 90°.
  2. Examiner palpates the anterolateral and medial joint lines at the knee and then passively flexes the knee while applying a values stress.
  3. Examiner then proceeds to passively extend the knee while applying a varus stress (movement should be circular in nature with a gradual increase in varus and valgus stress after each complete rotation).


Depending on the location and where the pressure is applied, this test can indicate medical and lateral meniscus lesions, medical and lateral collateral ligament strains and/or degenerative joint disease, osteoarthritis.

Positive Anderson Medial-Lateral Grind Test

There are three signs to show a positive Anderson Medial-Lateral Grind test.

  1. Pain with valgus force: Lateral meniscus lesion, medial collateral ligament strain
  2. Pain with varus force: Medial meniscus lesion, lateral collateral ligament strain
  3. Pain or crepitus with all motions: Degenerative joint disease, osteoarthritis, severe knee internal derangement, severe knee sprain/strain