A hip revision is a second surgery to repair or replace an artificial hip joint that is no longer working properly. Unlike the original hip replacement, which swaps out a damaged natural joint, a revision addresses problems that develop with the implant itself over time. Most artificial hips last 10 to 20 years, so as more people receive hip replacements at younger ages, revision surgery is becoming increasingly common.
Why Hip Implants Eventually Fail
The single biggest reason for revision is aseptic loosening, which accounts for about 44% of all reoperations. This happens when the bond between the implant and the surrounding bone gradually weakens without any infection involved. Daily movements create microscopic wear particles that trigger inflammation around the implant, slowly eroding the bone that holds it in place. The process is painless at first, but over years it progresses until the implant shifts enough to cause pain or instability.
Infection is the second most common cause, responsible for roughly 20% of revisions. It can strike early, within the first year or two, or develop years later when bacteria reach the implant through the bloodstream. Dislocation (the ball popping out of the socket) and fractures in the bone surrounding the implant round out the list, causing about 13% and 14% of revisions respectively. Alignment issues and reactions to metal debris from the implant surfaces are less frequent but still significant triggers.
The timeline matters. Infections and dislocations tend to cause problems within the first one to three years. Loosening, by contrast, builds gradually and becomes the dominant reason for revision after the ten-year mark.
How Doctors Determine You Need One
The workup typically starts with X-rays, which can reveal whether the implant has shifted position or if there are gaps between the implant and bone that suggest loosening. When X-rays aren’t conclusive, a nuclear medicine bone scan can detect increased activity around the implant that signals loosening. CT scans and MRIs may be ordered to assess the condition of the surrounding bone and soft tissue in more detail.
If infection is suspected, blood tests check for elevated inflammatory markers, and your doctor may aspirate the hip, inserting a needle to draw fluid from the joint for laboratory analysis. For patients with metal-on-metal implants, blood tests can also measure levels of metal ions to detect a reaction to the implant material.
What the Surgery Involves
Hip revision is a significantly more complex operation than the original replacement. The surgeon must remove the old implant (or the failed components), address any damage to the surrounding bone, and secure a new prosthesis in bone that has often lost some of its structural integrity. Operating times are longer, incisions are typically larger, and the technical demands are higher because the surgeon is working around scar tissue from the first procedure.
Bone loss is one of the central challenges. When an implant loosens, it often takes bone with it, leaving gaps or cavities that can’t support a new prosthesis on their own. Surgeons fill these defects with bone grafts sourced from tissue banks. Small, contained defects are packed with crushed (morselized) bone graft that integrates over time. Larger defects that lack structural support require shaped pieces of donor bone to rebuild the architecture before the new implant can be placed. The mechanical stability of this reconstruction is one of the strongest predictors of long-term success.
Two-Stage Revision for Infected Hips
When infection is the reason for failure, the process is more involved and happens in two separate surgeries. In the first stage, the surgeon removes the entire implant and all cement, aggressively cleans the joint, and places a temporary spacer made of antibiotic-loaded cement. This spacer serves double duty: it maintains the joint space so muscles don’t contract, and it delivers high concentrations of antibiotics directly to the infected area.
After the first surgery, you receive intravenous antibiotics for four to six weeks, followed by an antibiotic-free window of two to eight weeks. During this gap, doctors monitor blood work to confirm the infection is clearing. If everything looks good, the second surgery removes the spacer, cleans the joint again, and implants the new permanent prosthesis. The entire process from first surgery to completed revision typically spans several months, and prolonged delays between stages can actually make outcomes worse rather than better.
Risks Compared to Primary Replacement
Revision surgery carries higher complication rates than the original hip replacement across virtually every category. In a large study of Medicare patients, 17.3% experienced infection after revision, 15.8% needed yet another revision, and 11.1% developed blood clots. Dislocation occurred in about 5.4% of cases. The risk of a new infection developing even after a revision done for non-infectious reasons was 8.1%.
Age plays a specific role. Older patients face higher rates of blood clots and mortality, though age alone doesn’t increase the risk of dislocation, infection, or re-revision. Overall health matters more for most complications. Patients with multiple chronic conditions have elevated risk for nearly every complication except dislocation.
How Long Revised Hips Last
A revised hip generally doesn’t last as long as the original replacement. In one of the largest studies tracking over 1,100 revision patients for at least ten years, 82% of revised implants survived to the ten-year mark without needing another operation. That’s a solid result, but it’s lower than the survival rates for first-time replacements over the same period.
Outcomes also depend on why the revision was done. Revisions for aseptic loosening had the best ten-year survival at 84%, while those done for unexplained pain fared worst at 58%. Despite these numbers, 92% of patients with surviving implants reported being satisfied with the outcome of their revision surgery.
Recovery After Revision
Recovery from a hip revision takes longer than recovery from the original replacement. Weight-bearing restrictions are common, particularly when bone grafts were used or the new implant relies on uncemented fixation that needs time to bond with bone. Most protocols limit weight on the operated leg for 6 to 12 weeks, often starting with as little as 10% of body weight using a walker or crutches, then gradually increasing over the following weeks. Some patients use walking aids for up to three months.
Physical therapy is a critical part of recovery, focusing first on gentle range-of-motion exercises and progressing to strengthening as the bone heals. Because revision patients often have weaker bone and more soft tissue disruption than first-time replacement patients, the progression tends to be more cautious and individualized. Full recovery to the point where you can move comfortably through daily activities without aids typically takes longer than the three to six months expected after a primary replacement, though the exact timeline varies based on the complexity of the surgery and your overall health going in.