What is the M4s Knee Brace? The M4s Knee Brace is designed for use following gonarthrosis, treatment following knee surgery & ligament instability. The exceptionable M4s limits extension & flexion to the joint to assist in a full recovery following a serious knee condition. Adjustable ROM hinges support the knee from lateral & medial movement which keeps the joint completely stable during use. A 4-point Avional® frame allows for a lightweight yet exceptionally robust brace which protects the knee at all stages of the recovery process. How does it work? Featuring a robust Avional® frame & ROM hinges, the M4s Knee Brace is designed to take care of your recovery from the outset. Whether your injury is acute or chronic, the M4s is capable of withstanding just about any rehabilitation need possible. The non-slip soft padding ensures complete comfort during use & allows the patients skin to breath properly, preventing moisture pooling & irritable conditions. Size guide Measure the circumference of the thigh 15cm above the centre of the patella XS: 31-37cm S: 37-45cm M: 45-51cm L: 51-57cm XL: 57-65cm XXL: 65-74cm