Revision Knee Replacement San Diego CA

When a Knee Replacement Fails

Understanding Revision Knee Replacement

Modern knee replacements are designed to last for many years — studies suggest that roughly 85–90% of primary knee replacements may still be functioning well at the 15–20 year mark. However, implants can fail for a variety of reasons, and when pain, instability, or other problems arise, revision surgery may be the appropriate next step. Revision knee replacement is a complex, highly specialized procedure that requires careful preoperative planning, advanced surgical technique, and specialized implant systems.

At Grossmont Orthopedic Medical Group in La Mesa, CA, our fellowship-trained knee specialists bring focused experience in both primary and revision arthroplasty. A thorough diagnostic evaluation guides every revision plan, ensuring that the underlying cause of failure is identified and addressed before a new implant is placed.

Common Reasons Knee Replacements May Require Revision

Aseptic loosening — components gradually separate from the bone
Polyethylene wear — the plastic bearing surface wears down over time
Periprosthetic joint infection (PJI)
Instability — the joint does not feel stable during weight-bearing
Malalignment or improper component positioning
Arthrofibrosis — excessive scar tissue causing persistent stiffness
Periprosthetic fracture — bone fracture around the implant
Extensor mechanism failure

How Revision Differs from Primary Knee Replacement

Patients and families are often surprised to learn how significantly more demanding revision knee replacement is compared with a primary procedure. Several factors contribute to this complexity:

Greater Surgical Complexity

Removing well-fixed components from the bone requires specialized extraction tools and careful technique to minimize additional bone loss. Scarring from the prior surgery may obscure normal anatomical landmarks, adding further challenge. Operating times are typically longer than for primary replacements.

Bone Loss and Reconstruction

The original implant — and the process of removing it — may leave gaps or defects in the femur and tibia. These defects may need to be filled with bone graft, metal augments, or porous metal cones and sleeves, specialized components not used in standard primary surgery.

Specialized Implant Systems

Revision implants are designed with longer stems that extend deeper into the bone to achieve stability in the setting of bone loss and compromised soft tissue. Constraint levels — the degree of inherent mechanical stability built into the implant — may need to be increased to compensate for ligament deficiency.

Importance of Surgeon Experience

Because revision procedures are more technically demanding and the consequences of error are amplified, the experience of the surgical team matters greatly. Patients considering revision are encouraged to seek surgeons with specific fellowship training in revision arthroplasty and a substantial case volume in complex knee surgery.

Diagnosing a Failed Knee Replacement

Before revision surgery can be planned, the cause of failure must be identified with certainty. The workup typically includes a combination of the following:

Clinical History & Examination

The timing and character of pain, the presence or absence of fever and swelling, wound concerns, and the functional impact on daily life all provide critical clues to the underlying mechanism of failure.

Advanced Imaging

Weight-bearing X-rays may reveal loosening, subsidence, or osteolysis around the implant. CT scanning may be used to assess component positioning and remaining bone stock. Metal artifact reduction MRI may help evaluate soft tissue structures in select cases.

Laboratory & Joint Aspiration

Blood markers (ESR, CRP, interleukin-6) and synovial fluid cell counts obtained by joint aspiration are essential for ruling infection in or out before revision surgery is undertaken. A two-stage revision protocol may be warranted when infection is confirmed.

Surgical Approach

The Revision Procedure

Each revision case is unique. The surgical plan is built around the patient's specific cause of failure, bone quality, soft tissue condition, and functional goals.

Single-Stage Revision

When failure is due to mechanical causes — loosening, wear, malalignment, or instability — and infection has been excluded, revision may be completed in a single operation. The surgeon removes the existing components, prepares the bone surfaces, manages any defects, and implants the new revision system in one surgical setting. Recovery follows a similar arc to primary knee replacement but typically takes longer given the added complexity of the procedure.

Two-Stage Revision for Infection

When a periprosthetic joint infection is confirmed, a two-stage approach is typically recommended. In the first stage, all implant components and infected tissue are removed and an antibiotic-laden cement spacer is placed while the patient completes a course of targeted antibiotic therapy. In the second stage — performed after infection has been eradicated — permanent revision implants are placed.

Recovery After Revision Surgery

Recovery from revision knee replacement is generally longer and more demanding than recovery from a primary procedure. Patients may require a short inpatient hospital stay. Physical therapy begins promptly, but progression through milestones — weight-bearing advancement, range of motion, and return to daily activities — may take longer than after a primary replacement. Realistic expectations and a committed approach to rehabilitation are important factors in achieving a good outcome.

Common Questions

Frequently Asked Questions

Why do knee replacements fail?

Knee replacements may fail for several reasons, including implant wear over time, loosening of the components from the bone, infection, instability, malalignment, stiffness, or fracture of the bone around the implant (periprosthetic fracture). The most common reason for revision within the first few years is infection or instability, while implant wear and aseptic loosening tend to become more common over longer time periods.

How do I know if my knee replacement needs to be revised?

Common warning signs that a knee replacement may need revision include new or worsening pain (especially pain at rest or at night), swelling that does not resolve, a sensation of instability or the knee giving way, stiffness, warmth or redness around the joint, or a visible change in limb alignment. These symptoms do not always mean revision is needed — a thorough evaluation including X-rays, laboratory tests, and possibly joint aspiration is required to determine the cause and appropriate next steps.

Is revision knee replacement more risky than the first surgery?

Revision knee replacement is generally more complex than a primary replacement and may carry a higher risk of complications. The procedure typically takes longer, involves addressing bone loss left by the original implant, and requires specialized implant systems. However, in the hands of an experienced revision surgeon, outcomes can be very good. The risk of complications is also influenced by the reason for revision and the patient's overall health.

How long does a revised knee replacement last?

A revised knee replacement may last for many years, though durability can vary based on factors such as the reason for revision, the degree of bone loss, implant selection, and the patient's activity level and health. Your surgeon will discuss realistic expectations for longevity based on your specific situation.

Your Surgical Team

Meet Our Revision Knee Specialists

Dr. Peter B. Hanson, MD

Hip & Knee Specialist

Board Certified by the American Board of Orthopaedic Surgery and a Fellow of the AAOS, Dr. Hanson has performed over 3,000 direct anterior hip replacements since 2005. He was fellowship-trained in Total Joint Reconstruction at Scripps Clinic.

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Dr. Andrew E. Yoo, MD