Revision Knee Replacement
Revision Total Knee Replacement (RTKR)
Revision Total Knee Replacement (RTKR) is a complex surgical procedure to replace a previously implanted artificial knee joint that has failed, worn out, or become infected. It is technically more demanding than a primary replacement because there is often less healthy bone remaining, requiring specialized components and techniques.
When You Should Consider Revision Total Knee Replacement
Increased pain or a "giving way" sensation in a previously replaced knee.
New onset of swelling, redness, or warmth, which may indicate a late-stage infection.
Noticeable instability or a feeling that the knee joint is loose during movement.
Aseptic loosening, where the bond between the metal and bone has broken down.
Mechanical wear of the original plastic spacer, leading to bone-on-metal contact.
Methods of Revision Total Knee Replacement
Single-Stage Revision: The removal of old components and placement of new ones during a single operation, typically for non-infected failures.
Two-Stage Revision: The gold standard for infection, involving the temporary placement of an antibiotic spacer followed by a second surgery weeks later.
Augmentation: Using metal pieces (augments) or "cones" to fill holes or voids where bone has been lost.
Bone Grafting: Utilizing donor bone (allograft) to rebuild the platform for the new implant.
Stemmed Fixation: Using revision implants with long stems that reach deep into the femur and tibia for added stability.
How Revision Total Knee Replacement Is Performed
Component Removal: The surgeon delicately removes the original metal and plastic parts while preserving as much healthy bone as possible.
Debridement: Removal of scar tissue and any infected tissue or "biofilm" found within the joint space.
Structural Rebuilding: Reconstructing the bone platform using grafts or metal augments to ensure a level surface for the new joint.
Constrained Implant Placement: Installing a new joint mechanism that is more rigid to compensate for weakened or damaged ligaments.
Fixation: Securing the new, longer-stemmed components using specialized bone cement or press-fit technology.
Pre-Procedure Preparation
Extensive diagnostic testing, including specialized X-rays, CT scans, or MRIs to assess bone loss.
Mandatory blood tests (CRP and ESR) and joint fluid aspiration to rule out hidden infections.
Surgical planning that may involve 3D-printed models of the patient's specific bone structure.
Medical optimization, including heavy sedation or general anesthesia, to prepare for a longer surgery (2 to 4 hours).
Tests Before Revision Total Knee Replacement
Joint Fluid Aspiration: Drawing fluid from the knee to check for bacteria or high white blood cell counts.
CT and MRI Scans: To provide a detailed map of bone voids and the integrity of the surrounding soft tissue.
ESR and CRP Blood Tests: Markers used to detect systemic inflammation or localized infection.
Specialized Revision X-rays: To evaluate the alignment and stability of the existing implants before removal.
Life After Revision Total Knee Replacement
Hospital stays are typically longer than primary replacements, ranging from 3 to 5 days.
Weight-bearing may be restricted to "partial" status with crutches or a walker for 6 to 12 weeks.
Physical therapy is more intensive and slower-paced due to the presence of significant scar tissue.
Revision implants typically have a lifespan of 10 to 15 years, slightly shorter than primary implants.
While 80–90% of patients achieve good results, the range of motion may be slightly less than after the first surgery.
Benefits of Revision Total Knee Replacement
Successfully restores mobility and relieves chronic pain caused by a failed primary implant.
Addresses life-threatening or joint-threatening infections through the two-stage process.
Provides a stable joint for patients who have suffered significant bone loss or ligament damage.
Utilizes advanced stemmed technology to ensure the new joint remains secure within the bone.