A revision hip replacement is a second surgery to remove and replace some or all of the components from a previous hip replacement that has worn out, loosened, or failed. It shares the same goal as the original procedure, relieving pain and restoring mobility, but it is significantly more complex. Most revision surgeries take several hours, compared to the one to two hours typical of a first-time hip replacement, and they require specialized implants and extensive preoperative planning.
Why a Hip Replacement Might Need Revision
Modern hip replacements last a long time, but they don’t last forever. A large review published in The Lancet found that about 89% of hip replacements are still functioning at 15 years and roughly 78% at 20 years. People who receive their first hip replacement at a younger age tend to wear through their implants faster because of higher activity levels and more years of use.
When an implant does fail, the most common reason is aseptic loosening, which accounts for about 52% of all revision cases. This happens when the bond between the implant and the surrounding bone gradually breaks down over time, often accelerated by tiny particles shed from the implant’s bearing surfaces. These particles trigger an immune response that slowly eats away at the bone around the implant, a process called osteolysis. Eventually the implant becomes loose enough to cause pain with every step.
Other reasons for revision include:
- Instability or dislocation (about 17% of cases), where the ball repeatedly pops out of the socket
- Infection (about 16%), which can develop weeks or even years after the original surgery
- Persistent pain (about 8%) without a clear mechanical explanation
- Fracture around the implant (about 6%), often from a fall
- Component failure (about 2%), where the implant itself cracks or breaks
How Surgeons Diagnose Implant Failure
If you’re experiencing new or worsening hip pain years after a replacement, your surgeon will start with X-rays to check whether the implant has shifted position or whether the bone around it shows signs of thinning. Comparing current X-rays with older ones taken shortly after the original surgery makes loosening much easier to spot.
Blood tests for inflammatory markers help determine whether infection is involved. If infection is suspected, your surgeon may draw fluid directly from the hip joint with a needle and send it to a lab to identify the specific bacteria. This step is critical because it changes the entire surgical approach.
What Happens During the Surgery
The basic steps involve removing the old implant, preparing the bone, and fitting new components. In practice, this is far more involved than it sounds. Removing a well-fixed implant, or one cemented into place, often requires cutting away surrounding bone. Years of wear may have left significant bone loss that the surgeon must reconstruct before a new implant can be anchored securely.
To manage bone loss, surgeons use several techniques depending on how much bone is missing. When the damage is relatively contained, packed bone graft (donor bone chips) can fill the gaps before a new stem is cemented in. For more extensive defects, surgeons may use longer stems that bypass the damaged area and grip intact bone further down the thigh. In cases of severe bone loss, large structural grafts from a donor femur or even custom-built metal replacement pieces for the upper femur may be needed.
The implants themselves differ from standard hip replacements. Revision stems are typically longer, with textured or ridged surfaces designed to grip bone over a larger area. Modular stems, which come in separate pieces that lock together during surgery, give the surgeon flexibility to adjust leg length and alignment on the spot. Non-modular one-piece stems are simpler in design and avoid the small risk of corrosion at connection points, though they offer less intraoperative adjustability.
Revision for Infection
Infected hip replacements require a different strategy. When the infection involves relatively mild bacteria and the surrounding soft tissue is healthy, some surgeons perform a one-stage revision: the old implant is removed, the joint is thoroughly cleaned, and a new implant is placed all in one operation, using antibiotic-loaded cement.
More aggressive infections, resistant bacteria, or damaged soft tissue call for a two-stage approach. In the first surgery, the old implant is removed and a temporary spacer loaded with antibiotics is placed in the hip. You then receive several weeks of antibiotic treatment, typically six to eight weeks. Once blood tests confirm the infection has cleared, a second surgery removes the spacer and implants the permanent replacement. The two-stage approach means two major operations and months of limited mobility between them, but it offers the best chance of eradicating a stubborn infection.
Recovery Takes Longer Than the First Time
Recovery from revision surgery is consistently slower and more difficult than recovery from a primary hip replacement. Most patients are encouraged to stand and take a few steps with a walker or crutches either the same day or the day after surgery. A hospital stay of one to two nights is typical, though some patients need additional time or a short stay at a rehabilitation facility.
At around six to eight weeks, you can expect to be roughly 20% recovered and more comfortable putting weight on the hip. Full recovery stretches out over many months and, for complex revisions, can take a year or longer. The extended timeline reflects the greater surgical trauma, the need for bone grafts to heal and integrate, and the longer period of muscle weakness that follows a more invasive procedure.
Long-Term Outcomes and Success Rates
Revision hip replacements do improve quality of life for most people, but the results are not quite as reliable as a first-time replacement. In a study of patients aged 60 and younger, 78% of revised hips survived without needing another surgery at five years, and 71% lasted to ten years. The reason for the original revision made a significant difference in how well the new implant held up. Revisions done for wear or bone thinning around the implant had a 92% success rate at ten years, and those for aseptic loosening reached 88%. Revisions for dislocation fared much worse, with only about 26% lasting a decade without further surgery.
Functional scores tell a similar story of meaningful but more modest improvement compared to primary replacements. On average, patients saw their hip function scores jump by about 21 points at six years after revision. By twelve years the improvement had settled to about 13 points above the pre-surgery baseline, suggesting some gradual decline over time but still a net benefit. A broader meta-analysis of revision outcomes in older patients (average age 67) found an even larger average improvement of 37 points at five years, likely reflecting the lower physical demands placed on the hip by less active individuals.
Each successive revision becomes more challenging because there is less healthy bone to work with. This is one reason surgeons are cautious about recommending revision and will exhaust non-surgical options first when possible. It is also why the longevity of the original implant matters so much: the longer a primary hip replacement lasts, the fewer revisions a person is likely to face in their lifetime.