Otto Bock Genu Arexa - Rigid FrameOTT50K13 Genu Arexa Rigid Frame Knee Brace The Genu Arexa rigid frame orthosis stabilises the knee during the healing process and prevents undesirable movements. It also permits a controlled transition to full weight bearing. Early mobilisation is the best way to ensure that full weight can quickly be placed on the knee. The Genu Arexa has been prescribed by doctors for many years. Its functional design has already received many international awards.