A loose hip replacement is almost always fixed with revision surgery, a procedure where the surgeon removes the failed components and replaces them with new ones. There is no reliable non-surgical way to reattach an implant that has come loose from the bone. The good news: revision hip surgery has a strong track record, with about 85% of revised implants still functioning well at the 10-year mark.
Why Hip Replacements Come Loose
Every time you take a step, the surfaces of your artificial hip joint rub together and shed microscopic particles. Over years, these tiny fragments of plastic or metal accumulate in the tissue surrounding the implant. Your immune system treats them as foreign invaders and sends inflammatory cells to clean them up. The problem is that this immune response also dissolves the bone anchoring your implant, a process called osteolysis. As bone erodes, the implant loses its grip and begins to shift.
Loosening can also happen if the implant never bonded solidly to the bone in the first place, or if years of physical stress gradually break down the fixation. Poor initial fixation leads to micromotion between the implant and bone, which accelerates the release of even more wear debris, creating a cycle that speeds things up. The amount of debris around an implant generally correlates with the degree of loosening, though some people have a more aggressive immune response to these particles than others.
Signs Your Implant May Be Loosening
The hallmark symptom is “start-up pain,” a sharp discomfort that hits when you stand up from a chair and take your first few steps. Some people instinctively stomp or bang their foot into the ground a few times to make it subside. This pattern is distinctive enough that orthopedic surgeons consider it a classic indicator of a loosening stem.
Where you feel the pain matters. Groin pain typically points to the socket (acetabular) side of the replacement, while thigh pain suggests the stem component is loosening. A pain-free period after your original surgery followed by gradually worsening pain is a red flag. If the leg on your replaced side seems to be getting shorter over time, that can mean the stem is sinking deeper into the thighbone. Night pain or constant pain that doesn’t change with activity is more concerning for infection than loosening, but both warrant evaluation.
One tricky detail: loosening on the socket side can sometimes produce no symptoms at all. It may only show up on routine X-rays, which is one reason follow-up imaging matters even when you feel fine.
How Doctors Confirm Loosening
Standard X-rays are the first step. Your doctor looks for a gap between the implant and the surrounding bone. A gap less than 2 millimeters wide can be normal, representing stable tissue around the implant. But when that gap exceeds 2 millimeters and wraps around the entire circumference of the component, it indicates loosening. If serial X-rays taken months apart show the gap progressively widening, or if the implant has visibly shifted position, loosening is essentially confirmed.
When X-rays are inconclusive, a specialized CT scan (called SPECT-CT) can detect loosening, infection, fractures, and abnormal bone formation around the implant with greater precision. Blood tests and joint fluid analysis help rule out infection as the cause of symptoms, since infected and loose implants can look similar on imaging but require very different treatment.
What Happens During Revision Surgery
Revision surgery is a bigger operation than the original hip replacement. The surgeon opens the hip, removes the worn or loosened components, evaluates how much bone has been lost, and implants new parts. Components that have already detached from the bone can be taken out with minimal additional bone loss. But when a metal stem or socket that’s still partially bonded to bone needs to come out, some surrounding bone is inevitably lost in the process.
Rebuilding that lost bone is often the most challenging part. Surgeons use bone grafts, frequently from a deceased donor whose tissue has been screened for compatibility, to fill in deficits and create a solid foundation for the new implant. The graft materials range from small bone chips packed around the new component to large structural pieces that essentially reconstruct a section of the hip. Newer options include ceramic materials, specialized bone-growth proteins, and metal augments that fill gaps where bone once was.
Not every component needs replacing. If only the socket is loose and the stem is solidly fixed, the surgeon may revise just the socket and leave the stem alone, which shortens the operation and preserves more bone.
Recovery Takes Longer Than the First Time
Most people are up and walking with a walker or crutches within a day of revision surgery. But the recovery timeline is significantly slower than after a primary hip replacement because the surgery is more extensive and the bone needs time to incorporate any grafts.
At six to eight weeks, you can expect to be roughly 20% recovered and should feel comfortable putting more weight on the hip. Physical therapy typically begins about four weeks after surgery, though your surgeon may delay this depending on the complexity of the revision and how much bone grafting was involved. Full recovery stretches over several months, and some people notice gradual improvement continuing past the one-year mark.
Risks Are Higher Than the Original Surgery
Revision surgery carries higher complication rates than a first-time hip replacement. In large studies, infection occurs in about 17% of revision cases, compared to roughly 1-2% after primary surgery. About 16% of patients eventually need another revision. Other complications include blood clots (11%), dislocation of the new implant (5.4%), and pulmonary embolism (3.2%). The overall mortality rate is about 2.1%.
These numbers are higher partly because revision patients tend to be older, have less bone to work with, and face a more complex surgical environment. The risk profile varies considerably depending on why the revision is needed, how much bone loss has occurred, and your overall health. A straightforward liner swap in a relatively young, healthy person carries far less risk than a complete reconstruction with extensive bone grafting.
How Long a Revised Hip Lasts
A revised hip replacement performs well for most people but generally doesn’t last quite as long as the original. A study of 758 patients found an implant survival rate of 85% at 10 years after revision. Patient-reported outcomes for pain and function remained favorable at both the 5- and 10-year follow-up points.
Modern materials are helping extend that lifespan. Newer plastic liners made from highly cross-linked polyethylene shed fewer wear particles than the conventional plastic used in older implants. Since particle-driven bone loss is the primary driver of loosening, reducing wear at the source addresses the root problem. In large registry studies comparing the two materials, the newer plastic showed a lower revision risk out to 20 years of follow-up.
Are There Non-Surgical Options?
For true implant loosening, no. Once the bond between the implant and bone has failed, no medication, injection, or therapy can restore it. Pain management, activity modification, and assistive devices like canes can help you cope while waiting for surgery or if you’re not healthy enough to undergo a revision. But these are strategies for managing symptoms, not fixing the underlying problem. The loose implant will continue to shift and erode bone over time, which makes an eventual revision more difficult. For patients who are medically able to tolerate surgery, earlier revision generally leads to better outcomes because there is more bone left to work with.