Positioning device for stress imaging of the knee (OSSKAR)

The Oxford Stress System for Knee Arthroplasty Radiographs (OSSKAR) is a medical device for positioning the lower limb for stress imaging of the knee. The device positions the lower limb for valgus and varus stress imaging of the knee using a standardised technique without the requirement for the clinician or additional healthcare practitioner.


  • Assessment of the pattern and severity of arthritis within the medial and lateral compartments of the adult knee.
  • Assessment of the status of the ligamentous structures within the adult knee (collateral and cruciate ligaments).

Valgus and Varus positioning

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