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 lossof integrity 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