When is Revision necessary?
Pain is the primary reason for revision. Usually the cause is clear but not always. Knees without an obvious cause for pain in general do not do as well after surgery.
Plastic (polyethylene) wear - This is one of the easier revisions where only the plastic insert is changed.
Instability - This means the knee is not stable and may be giving way or not feel safe when you walk.
Loosening of either the femoral, tibial or patella component - This usually presents as pain but may be asymptomatic. It is for this reason why you must have your joint followed up for life as there can be changes on X-ray that indicate that the knee should be revised despite having no symptoms.
Infection- usually presents as pain but may present as swelling or an acute fever.
Osteolysis (bone loss). This can occur due to particles being released into the knee joint that result in bone being destroyed.
Stiffness- This is difficult to improve with revision but can help in the right indications.