This present study seeks to explore in more detail how the Tomofix and Ellipse high-tibial osteotomy systems function in relation to bone regeneration in the open-wedge created as part of the procedure by utilising CT imaging techniques rather than standard clinical X-ray imaging. The primary aim of osteotomy is realignment of the joint and thereby preserves the joint so that the patient can continue to enjoy the active life style, sports and recreational activities. After an osteotomy procedure, whenever a patient asks for advice to the clinician when they can start participating in unrestricted sports activities, clinicians often find it very difficult to answer this question. This is primarily because it is often very difficult to quantify the bone healing process precisely on radiographs. By quantifying the amount of bone healing on CT scan which is more clear and accurate, the clinician can confidently advise the patient regarding the participation in various sports activities without ambiguity.