No patients recruited into study.

Prospective data collection on clinical and radiographic outcomes of Cementless oxford Partial Knee.

Prospective radiographic and clinical data collection on outcomes of Cementless oxford Partial Knee. Screened radiographs are taken postoperatively and after 12 months. Oxford Knee Scores, SF12 Health Questionnaires and American Knee Society Radiographic Assessment are taken at 12 month follow-up.

Inclusion Criteria:

1. Patients undergoing primary knee arthroplasty

2. Patients with one of the following primary diagnoses in the medial compartment of the knee:

   • Osteoarthritis,
   • Avascular necrosis

Exclusion criteria:

1. Inability to co-operate with and complete the study.
2. Inadequate fixation of cementless components. If either before or after randomization the surgeon feels that cementless fixation is inadequate, cemented components should be inserted.

Patients Who Received Cementless Oxford Partial Knee for Its Indications for Use/Intended Uses - primary diagnoses in the medial compartment of the knee:

• Osteoarthritis,
• Avascular necrosis

There is no plan to share Individual Patient Data.