This is a prospective Randomised Control Trial to compare the Early Clinical and Functional Outcome of the ROCC and LCS total knee arthroplasty implant designs.

This study compares two similar designs of cementless rotating bearing total condylar knee replacements. The study will be conducted at a single clinical unit with a senior orthopaedic surgeon implanting all devices.Their performances will be assessed by clinical scores and comprehensive function outcome documentation undertaken by qualified physiotherapists. The persons undertaking the assessments will be blinded to which implants the patients have.

Inclusion Criteria:

• Patients suitable for cementless knee replacement
• Patients skeletally mature and under 80 years of age at pre-operative clinic
• Patients presenting with osteoarthritis of the knee
• Patients must be ambulatory at time of pre-operative clinic
• Patients must be able to understand instructions and be will to return for follow-up

Exclusion Criteria:

• Previous knee surgery (except arthroscopic/open menisectomy)
• Patients with inflammatory arthritis
• Patients with significant medical co-morbidity - ASA IV
• Disorders causing abnormal gait or significant pain
• Patients unable to consent
• Severe visual impairment