This support provides mild compression and support for injured knee. It is used in? ACL(anterior cruciate ligament)/ PCL(posterior cruciate ligament) instability.? An ACL or PCL injury occurs when the ligament has been torn. The tear may be partial or complete. The brace is also used for immobilization in post-operative care. Size specification Size?????????????? Knee circumference Small????????????? 30-34cm Medium?????????? 34-38cm Large????????????? 38-42cm Xlarge???????????? 42-46cm XXlarge?????????? 46-50cm