Does balanced resection provide a better post-operative functional and radiological result than measured resection in primary total knee arthroplasty.

INTERVENTION: Balanced resection: This is a method whereby the surgeon uses a tensor balancer device to distract the joint to be able to produce an equal and rectangular flexion/extension gap through ligament balancing before the femoral cuts are made. The duration is usually no longer than 15 minutes. CONDITION: Osteoarthritis Rheumatoid Arthritis PRIMARY OUTCOME: Functional ‐ improvement in knee score using the International Knee Society Score (IKS), SF‐12 survey and the Knee injury and Osteoarthritis Outcome Score (KOOS) short‐form survey. Radiological: ; Alignment measured using long‐leg standing films using lines of the anatomical axis and the knee joint line. ; Rotation through Perth Protocol CT‐Scan SECONDARY OUTCOME: Infection rate: assessed by clinical presentation deemed to be an infected joint by the treating surgeon, requiring washout. Will be classified as deep if involving joint capsule and superficial if not involving joint capsule, as deemed by operative notes during washout. Range of motion using a goniometer. INCLUSION CRITERIA: Those undergoing a primary total knee arthroplasty