Sudden pain after hip replacement usually signals one of a few specific problems
Pain that appears weeks or months after your hip replacement healed is not normal, and you should contact your surgeon. The most common causes are infection, implant loosening, muscle strain from overuse, or scar tissue buildup. Some of these need urgent attention; others respond to rest and physical therapy. The key is telling your surgeon exactly when the pain started, what you were doing when it began, and how it feels different from your recovery pain.
Your surgeon cannot diagnose you through a phone call, but they can tell you whether to come in right away or schedule a regular appointment. If you have fever, severe swelling, or cannot put weight on your leg, call when ready or go to an emergency room.
Key Takeaways
- Sudden pain months after recovery may mean infection, loosening, overuse, or scar tissue — each requires different treatment.
- Fever, severe swelling, inability to bear weight, or warmth around the incision are signs to seek when ready medical attention.
- Your surgeon needs to know the exact timing, what triggered the pain, and how it differs from your original recovery pain.
- X-rays or blood tests may be needed to find the cause, but you cannot know which without seeing your doctor first.
Infection as a source of sudden pain
Infection can occur months or even years after surgery, though it is less common the longer you are out from the operation. It usually starts at the incision site or spreads through the bloodstream from another part of your body — a dental procedure, urinary tract infection, or skin wound can all seed bacteria to your hip.
Signs of infection include fever (over 101°F), warmth or redness around the scar, swelling that is worse than before, drainage from the incision, or pain that is sharp and constant rather than activity-related. You may also feel generally unwell or fatigued. If you have any of these, call your surgeon the same day or go to an urgent care or emergency room. Infection is one of the few hip replacement problems that can worsen quickly and needs antibiotics or surgery to treat.
Your surgeon will likely order blood tests and possibly imaging to confirm infection. Do not wait to see if it improves on its own.
Implant loosening and wear
Over time, the artificial hip can loosen where it attaches to your bone, or the plastic or metal surfaces can wear. This usually happens gradually — you might notice increasing pain over weeks or months rather than a sudden onset. However, if you had a fall or heavy impact, loosening can become symptomatic suddenly.
Loosening pain is often worse with weight-bearing activities like walking or climbing stairs, and it may feel like a deep ache or instability in the hip. You might also notice a clicking or popping sensation. X-rays can show loosening clearly, so your surgeon will order imaging to confirm. Treatment depends on how loose the implant is and may range from activity modification to revision surgery, where the surgeon replaces the loose component.
Overuse and muscle strain
If you recently increased your activity — started a new exercise routine, walked farther than usual, or did heavy lifting — you may have strained the muscles around your hip. This is not a problem with the implant itself but rather inflammation in the soft tissue. The pain usually appears within a day or two of the activity and feels like a muscle ache or soreness rather than deep joint pain.
Rest, ice for the first 48 hours, and over-the-counter anti-inflammatory medication like ibuprofen often help. Your physical therapist can also guide you on how much activity is safe at your current stage of recovery. If the pain does not improve in a week or worsens, contact your surgeon to rule out other causes.
Scar tissue and stiffness
Scar tissue can build up around the hip joint, limiting motion and causing pain when you try to move in certain directions. This is called arthrofibrosis. It is more common in people who had complications during recovery or who did not do physical therapy consistently, but it can happen to anyone.
The pain is usually worse with specific movements — bending, rotating, or straightening the hip — and improves with gentle stretching. Your physical therapist can work on breaking up scar tissue through targeted exercises and manual therapy. If scar tissue is severe and limits your function significantly, your surgeon may recommend a procedure called manipulation under anesthesia, where the surgeon gently moves the joint through its full range while you are asleep to break adhesions.
Bursitis and inflammation around the hip
Bursae are small fluid-filled sacs that cushion the muscles and tendons around your hip. They can become inflamed from overuse, muscle imbalance, or pressure from the implant itself. Bursitis causes pain on the outside of the hip or deep in the groin, and it often feels worse when you lie on that side or climb stairs.
Bursitis usually responds to rest, ice, and anti-inflammatory medication. Your physical therapist can identify muscle imbalances — such as weakness in your hip abductors — that may be contributing and help you correct them. If bursitis persists beyond two weeks, your surgeon may recommend an ultrasound-guided injection of corticosteroid to reduce inflammation.
What to tell your surgeon when you call
Have the following information ready when you contact your surgeon's office: the date your surgery was performed, when the pain started, what you were doing when it began, whether it came on suddenly or gradually, and how it feels (sharp, dull, aching, stabbing). Also mention any fever, swelling, redness, drainage, or inability to bear weight.
Describe which movements make it worse — walking, climbing stairs, lying on that side, rotating the leg — and whether rest or ice helps. If you have had any recent infections, dental work, or other surgeries, mention those too. The more specific you are, the better your surgeon can assess whether you need to be seen urgently or can wait for a scheduled appointment.
When to go to the emergency room
Seek when ready care if you have fever above 101°F, severe swelling or warmth around the incision, inability to bear any weight on the leg, severe pain that does not improve with rest and medication, or signs of a blood clot such as calf swelling, warmth, or redness. You should also go to the emergency room if you fell and hit your hip hard, as this can cause fracture or dislocation of the implant.
Do not try to drive yourself if you cannot bear weight. Call an ambulance or have someone take you. The emergency room can order imaging and blood work quickly and contact your surgeon if needed.
Frequently Asked Questions
Is some pain normal years after hip replacement?
Mild, occasional discomfort with heavy activity is common, but sudden new pain or pain that worsens over time is not. If pain is affecting your daily life or has changed from your baseline, contact your surgeon. They can determine whether it is a minor issue or something that needs treatment.
Can I wait a few days to see if the pain goes away on its own?
If you have no fever, swelling, or inability to bear weight, waiting a few days while resting the hip is reasonable. Use ice, take anti-inflammatory medication, and avoid activities that make it worse. If pain persists beyond a week or worsens, call your surgeon. Do not wait if you have fever or severe swelling.
What if my surgeon says I need revision surgery?
Revision surgery means replacing one or both components of the implant. It is more complex than the original surgery and has a longer recovery, but it is often necessary if the implant is loose, infected, or severely worn. Your surgeon will explain why revision is needed and what to expect during recovery.
Can physical therapy cause sudden pain?
Aggressive physical therapy can cause muscle soreness, which usually feels like an ache and improves with rest. However, sharp pain during therapy is a sign to stop and tell your therapist. They should adjust the intensity or technique. If pain worsens after therapy sessions, mention it to your surgeon.
How long does it take to know what is causing the pain?
Your surgeon can often identify the cause during an office visit and with X-rays, which takes a few days to a week. Blood tests for infection take a few days to come back. If imaging is unclear, an MRI or CT scan may be ordered, which can take another week or two. Urgent problems like infection are usually identified quickly.