The Medacta International GMK Sphere Cementless Post-Marketing Surveillance Study

Inclusion Criteria:

• A disabled or severely disabled joint as a result of arthritis, traumatic arthritis,rheumatoid arthritis, poly-arthritis or avascular necrosis
• Patients between the age of 18 and 80 at the time of consent
• Listed for total knee replacement surgery.
• Patients who are willing and able to give informed written consent

Exclusion Criteria:

• Progressive local or systemic infection
• Muscular loss, neuromuscular disease or vascular deficiency of the affected limb,making the operation unjustifiable
• Severe instability secondary to advance destruction of condralar structures or loss ofintegrity of the medial or lateral ligament
• Those whose prospects for a recovery to independent mobility would be compromised byknown coexistent, medical problems
• Patient whose BMI exceeds 40
• Any case not described in the inclusion criteria