A Clinical Investigation of the Oxford® Meniscal Unicompartmental Knee System

Study Objective

To provide a prospective 2-year post-operative evaluation of complications and 9-year long-term survivorship analysis of patients implanted with the Oxford™ Meniscal Unicompartmental Knee System at multiple sites in the United States.

Study Design

The study is designed as a prospective, multi-center, non-randomized post approval study. There are two phases to this study:

• A complications study where patients will be followed for at least 2 years to record all complications that may occur, and
• A survival study that will record at yearly intervals out to 9 years whether or not the device is still in place or if it has been removed for any reason.

Phase 1 requires clinical follow-up (0-2 year) and patients will be evaluated at pre-defined intervals up to 2 years post-operative. Information gathered in phase 1 includes all adverse events and survival data.

Phase 2 (3-9 year) only gathers survival data through patient directed mailing and/or phone call.

Inclusion criteria

• Patients with one of the following diagnoses in the medial compartment of the knee: Osteoarthritis, Avascular Necrosis

Exclusion criteria

• Patients with Rheumatoid arthritis or other forms of inflammatory joint disease
• Patients with infection, sepsis, and osteomyelitis
• Patients with Osteoporosis, Paget's Disease, Charcot's disease, Osteomalacia, and Severe Osteoporosis