Hemiarthroplasty may sound like a word invented during a spelling bee for orthopedic surgeons, but the idea is easier to understand than the name suggests. It is a partial joint replacement surgery, most often performed on the hip, where the damaged ball of the hip joint is replaced with an artificial implant while the natural socket is left in place.
This procedure is commonly used to treat certain hip fractures, especially displaced femoral neck fractures in older adults. When the ball of the thigh bone breaks and blood supply is disrupted, repairing the bone with screws may not be the best option. Instead, surgeons may replace the damaged part so the patient can move sooner, reduce pain, and avoid spending too long in bedbecause bed rest may sound peaceful until it starts causing its own medical drama.
In this guide, we will explain what hemiarthroplasty is, why it is done, how the procedure works, what recovery looks like, possible complications, and practical experiences that can help patients and caregivers feel more prepared.
What Is Hemiarthroplasty?
Hemiarthroplasty is a type of partial hip replacement. “Hemi” means half, and “arthroplasty” means joint replacement. In hip hemiarthroplasty, the surgeon replaces the femoral headthe rounded ball at the top of the thigh bonewith a metal prosthesis. The acetabulum, or hip socket, is usually left untouched.
This makes hemiarthroplasty different from total hip replacement, where both the ball and the socket are replaced. Think of the hip as a ball-and-socket door hinge. Hemiarthroplasty changes the ball; total hip replacement changes the ball and the socket. Less hardware, but still a serious operation.
Common reasons for hemiarthroplasty
Doctors may recommend hemiarthroplasty for:
- Displaced femoral neck fractures
- Hip fractures in older adults with lower activity levels
- Fractures where blood supply to the femoral head is damaged
- Cases where internal fixation may have a high risk of failure
- Some severe joint injuries where preserving the femoral head is not realistic
Although the hip is the most common site, hemiarthroplasty can also refer to partial replacement in other joints, such as the shoulder. However, most patients searching this term are looking for information about hip hemiarthroplasty.
Hemiarthroplasty vs. Total Hip Replacement
Hemiarthroplasty and total hip replacement are related, but they are not identical twins. They are more like cousins who show up at the same family reunion wearing orthopedic shoes.
Hemiarthroplasty
In hemiarthroplasty, only the femoral head is replaced. It is often used after hip fractures, especially in older adults who may not need the full socket replacement. The surgery may be shorter and may carry a lower risk of dislocation compared with total hip replacement in some fracture patients.
Total hip replacement
Total hip replacement replaces both the femoral head and the acetabulum. It is commonly used for advanced arthritis, severe joint degeneration, or hip disease where the socket is also damaged. It may offer better long-term function for more active patients but can involve a more complex procedure.
How surgeons decide
The choice depends on age, bone quality, activity level, type of fracture, preexisting arthritis, overall health, and the patient’s ability to participate in rehabilitation. A very active older adult with arthritis may be considered for total hip replacement, while a less active patient with an isolated femoral neck fracture may be a better candidate for hemiarthroplasty.
Types of Hip Hemiarthroplasty
Not every hemiarthroplasty implant is the same. Surgeons choose the implant based on the patient’s anatomy, bone strength, fracture pattern, and medical condition.
Unipolar hemiarthroplasty
A unipolar implant has one large prosthetic head that moves directly within the natural hip socket. It is a simpler design and has been used for many years.
Bipolar hemiarthroplasty
A bipolar implant has an additional inner bearing, allowing motion both inside the prosthetic head and between the implant and the socket. The goal is to reduce wear on the natural socket, although results can vary depending on the patient.
Cemented vs. uncemented implants
A cemented implant uses bone cement to secure the stem inside the thigh bone. An uncemented implant relies on bone growing into the implant surface over time. Cemented stems may provide immediate fixation, especially in patients with weaker bone, while uncemented stems may be considered in selected patients with good bone quality.
Who Might Need Hemiarthroplasty?
Hemiarthroplasty is most often considered after a hip fracture, particularly a displaced femoral neck fracture. This type of fracture occurs just below the ball of the hip joint. In older adults, it can happen after a fall from standing height. In younger people, it usually requires higher-energy trauma, such as a car accident.
Older adults are at higher risk because bones may be weaker from osteoporosis, balance may be reduced, and reflexes may no longer move at superhero speed. A small trip over a rug, a pet, or a rogue slipper can lead to a major injury.
Patient factors doctors consider
- Age and activity level
- Bone density and osteoporosis risk
- Medical conditions such as heart disease, diabetes, or kidney disease
- Ability to walk before the fracture
- Cognitive status and ability to follow precautions
- Presence of arthritis in the hip socket
- Risk of complications from longer surgery
The goal is not simply to “fix the X-ray.” The real goal is to help the patient stand, walk, transfer safely, reduce pain, and return to the best possible level of independence.
How to Prepare for Hemiarthroplasty
When hemiarthroplasty is done after a hip fracture, preparation may happen quickly. Hip fractures are often treated urgently because prolonged immobility can increase the risk of pneumonia, blood clots, pressure injuries, muscle loss, and loss of independence.
Before surgery, the care team may:
- Order X-rays, CT scans, or other imaging
- Review medications, especially blood thinners
- Check heart, lung, kidney, and blood health
- Discuss anesthesia options
- Evaluate infection risk
- Plan pain control and blood clot prevention
- Start fall-risk and discharge planning early
Patients should tell the medical team about all medications, supplements, allergies, previous reactions to anesthesia, and any history of blood clots. This is not the time to be mysterious. Surgeons like surprises about as much as cats like bubble baths.
What Happens During the Hemiarthroplasty Procedure?
Hip hemiarthroplasty is performed in an operating room under general anesthesia, spinal anesthesia, or regional anesthesia with sedation. The exact surgical approach may vary. Some surgeons use a posterior approach, while others use lateral or anterior approaches depending on training, patient anatomy, and fracture characteristics.
Basic steps of the procedure
- The patient receives anesthesia and is positioned for surgery.
- The surgeon makes an incision near the hip.
- Muscles and soft tissues are carefully moved aside.
- The damaged femoral head is removed.
- The femur is prepared for the implant stem.
- The artificial femoral head and stem are inserted.
- The surgeon checks hip stability, leg length, and movement.
- The incision is closed with sutures, staples, or surgical adhesive.
The surgery commonly takes one to two hours, although timing can vary. Complex anatomy, previous surgery, severe fracture patterns, or medical issues may make the operation longer.
Hospital Recovery After Hemiarthroplasty
Recovery begins almost immediately after surgery. Nurses monitor blood pressure, oxygen levels, pain, wound drainage, and alertness. Patients may receive antibiotics, blood clot prevention medication, compression devices, and physical therapy evaluation.
One of the biggest goals is early mobilization. That may mean sitting at the edge of the bed, standing with help, or taking a few steps with a walker. It may feel like climbing a mountain in hospital socks, but those first steps matter.
Typical hospital goals
- Control pain safely
- Prevent blood clots
- Protect the surgical incision
- Begin walking with support
- Teach hip precautions if needed
- Plan discharge to home, rehab, or skilled nursing care
The hospital stay may last a few days, but this depends on overall health, mobility, pain control, home support, and whether complications occur.
Hemiarthroplasty Recovery Timeline
Recovery varies widely. Some patients walk with a walker within a day or two. Others need more time, especially if they were frail, ill, or less mobile before the fracture.
First few days
Patients focus on pain control, getting out of bed safely, breathing exercises, preventing clots, and learning how to move without stressing the new joint. A physical therapist may teach transfers from bed to chair, walking with a walker, and basic exercises.
First two to six weeks
This period is about building confidence and avoiding setbacks. Swelling, bruising, fatigue, and soreness are common. The patient may use a walker or cane, continue prescribed exercises, and attend physical therapy. Caregivers may need to help with meals, bathing, dressing, and transportation.
Six to twelve weeks
Many patients improve significantly during this stage. Walking distance may increase, pain may decrease, and daily activities become easier. Some people transition from a walker to a cane, while others need longer support. Recovery is not a race; there is no trophy for ditching the walker too early.
Three months and beyond
Patients may continue improving strength, balance, and endurance for several months. Older adults recovering from hip fracture may need ongoing fall prevention, bone health treatment, and home safety changes to reduce the risk of another fracture.
Physical Therapy After Hemiarthroplasty
Physical therapy is a major part of hemiarthroplasty recovery. The goal is to restore safe movement, improve strength, prevent stiffness, and reduce fall risk.
Common therapy goals include:
- Getting in and out of bed safely
- Standing and walking with a walker or cane
- Improving hip and leg strength
- Practicing stairs if needed
- Learning safe bathroom and chair transfers
- Improving balance and confidence
Therapy may happen in the hospital, at a rehabilitation facility, through home health services, or at an outpatient clinic. The right setting depends on the patient’s medical condition, home environment, and support system.
Hip Precautions After Hemiarthroplasty
Some patients are given hip precautions to lower the risk of dislocation. Precautions vary depending on the surgical approach and surgeon preference.
Common precautions may include:
- Avoid bending the hip too far forward
- Avoid crossing the legs
- Avoid twisting the operated leg inward or outward
- Use a raised toilet seat if recommended
- Sleep with a pillow between the legs if instructed
- Avoid low chairs that make standing difficult
Patients should follow the specific instructions from their surgeon and therapist. Internet advice can be helpful, but it does not know which incision you have.
Possible Complications of Hemiarthroplasty
Hemiarthroplasty is a common and useful procedure, but all surgery carries risk. Complications may be related to anesthesia, the implant, the wound, or the patient’s overall health.
Infection
Infection can occur near the incision or deep around the implant. Signs may include fever, increasing redness, warmth, drainage, worsening pain, or swelling. Deep infection may require antibiotics, surgery, or implant-related treatment.
Blood clots
Hip surgery increases the risk of deep vein thrombosis and pulmonary embolism. Doctors may prescribe blood thinners, compression stockings, or leg pumps. Patients are also encouraged to move as soon as it is safe.
Dislocation
Dislocation occurs when the artificial ball comes out of the socket. This risk is usually highest early in recovery while soft tissues are healing. It may require urgent treatment to put the joint back in place.
Implant loosening or failure
Over time, the implant may loosen, sink, or become painful. This is less common early after surgery but may occur later, especially in more active patients or those with poor bone quality.
Acetabular erosion
Because the natural socket remains in place, the artificial femoral head may gradually wear against it. This can cause groin pain and may eventually require conversion to total hip replacement.
Leg length difference
Some patients notice that one leg feels longer or shorter after surgery. Mild differences may improve as swelling decreases and walking mechanics normalize. Larger differences may require shoe lifts or additional evaluation.
Nerve or blood vessel injury
Rarely, nearby nerves or blood vessels may be injured. Symptoms can include numbness, weakness, unusual pain, or changes in foot color or temperature.
When to Call the Doctor
Patients should contact their surgeon or seek urgent care if they notice warning signs after hemiarthroplasty.
Red flags include:
- Chest pain or shortness of breath
- Sudden severe hip pain
- Inability to move the leg or bear weight
- Calf pain, swelling, warmth, or tenderness
- Fever or chills
- Worsening redness or drainage from the incision
- Foot numbness, weakness, or coolness
- A fall onto the operated hip
It is better to call early than to wait and hope the problem becomes shy and leaves. Complications are easier to treat when caught quickly.
Life After Hemiarthroplasty
Life after hemiarthroplasty depends on the patient’s health before the fracture, the success of surgery, rehabilitation progress, and home support. Some people return to independent living. Others need long-term assistance, especially if they had balance problems, dementia, frailty, or multiple medical conditions before surgery.
Many patients can walk, climb stairs carefully, sit in chairs, use the bathroom, and perform basic daily activities after rehabilitation. Higher-impact activities are usually discouraged. Walking, gentle strengthening, and supervised balance training are often safer choices than jogging, jumping, or testing whether the new hip enjoys trampoline parks. Spoiler: it does not.
How to Support a Loved One After Hemiarthroplasty
Caregivers play a huge role in recovery. Support does not mean doing everything for the patient. It means helping them do what is safe, encouraging movement, preventing falls, and making the home easier to navigate.
Helpful home changes include:
- Removing loose rugs and clutter
- Adding night lights
- Installing grab bars in the bathroom
- Using a shower chair
- Keeping frequently used items at waist height
- Arranging a firm chair with arms
- Making sure walkways are wide enough for a walker
Medication schedules, hydration, nutrition, and follow-up appointments also matter. Protein, vitamin D, calcium, and osteoporosis treatment may be discussed with the healthcare team to support bone health and reduce future fracture risk.
Experience-Based Tips for Hemiarthroplasty Recovery
Recovering from hemiarthroplasty is not just a medical event; it is a full household project. The surgery may happen in the operating room, but the recovery unfolds in bedrooms, bathrooms, hallways, kitchens, and sometimes in dramatic negotiations with a walker that seems determined to bump every doorway.
One of the most useful experiences patients and caregivers often share is this: prepare the home before discharge if possible. A patient recovering from hip surgery should not come home to a maze of extension cords, low chairs, slippery bath mats, and decorative rugs that behave like banana peels. Clear walking paths, place a sturdy chair in the main living area, and keep essentials nearby. A small table next to the chair or bed can hold water, medications, glasses, a phone, tissues, and the TV remotethe true scepter of recovery.
Another practical lesson is that fatigue can be surprisingly intense. Patients may expect pain, but many are caught off guard by how tiring simple activities feel. Walking to the bathroom, getting dressed, or sitting up for meals may require effort. This does not mean recovery is failing. Surgery, anesthesia, blood loss, disrupted sleep, pain medication, and the original injury all drain energy. Short, frequent movement sessions are often more realistic than one heroic march across the house.
Pain control also requires balance. Some patients avoid pain medicine because they fear side effects; others rely on it too heavily and become sleepy, constipated, or unsteady. The best approach is usually to follow the surgeon’s plan, report uncontrolled pain, and ask about safe ways to reduce opioids when appropriate. Ice, positioning, scheduled non-opioid medications, and gentle movement may help, but every patient’s plan should be individualized.
Bathroom safety deserves special attention. Many falls happen when people are tired, rushed, or trying to be “independent” a little too soon. A raised toilet seat, grab bars, non-slip footwear, and good lighting can make a major difference. Patients should avoid twisting quickly, reaching too far, or abandoning the walker because “it’s only three steps.” Famous last words often begin with “I’ll just…”
Physical therapy can feel repetitive, but repetition is the point. Small exercises build the strength needed for standing, walking, and balance. Caregivers can help by encouraging therapy without turning into a drill sergeant. A calm “Let’s do one more short walk” usually works better than “Move it, soldier.” Recovery is emotional, too. Frustration, fear of falling, embarrassment about needing help, and impatience are common. Kindness is not a bonus; it is part of the treatment environment.
Follow-up appointments are another key experience point. Patients may feel better and think they can skip visits, but the surgeon needs to check the incision, implant position, walking progress, and possible complications. Questions should be written down before appointments because the moment the doctor enters the room, many brains suddenly become freshly erased whiteboards.
Finally, recovery is easier when expectations are realistic. Hemiarthroplasty can reduce pain and allow earlier mobility after a serious hip fracture, but it does not instantly restore pre-injury strength. Older adults may need weeks or months of rehabilitation, and some may not return fully to their previous level of independence. That can be difficult to accept, but progress still counts. Standing safely, walking farther, sleeping better, using fewer pain pills, and returning to favorite routines are all victories worth noticing.
The best recovery mindset is patient, practical, and steady. Hemiarthroplasty is not a magic hip wand. It is a tool that works best when paired with rehabilitation, fall prevention, medical follow-up, nutrition, and support. In other words, the implant is importantbut so is the person learning to trust it one careful step at a time.
Conclusion
Hemiarthroplasty is a partial joint replacement procedure most commonly used to treat certain hip fractures, especially displaced femoral neck fractures in older adults. By replacing the damaged femoral head while preserving the natural socket, the surgery can reduce pain, support earlier movement, and help patients regain function after a serious injury.
Recovery requires teamwork. Surgeons, nurses, physical therapists, patients, and caregivers all play important roles. The procedure may be finished in the operating room, but the real comeback happens during rehabilitation, safe movement, home adjustments, and follow-up care.
Like any surgery, hemiarthroplasty carries risks, including infection, blood clots, dislocation, implant problems, and socket wear. However, careful planning, early mobilization, blood clot prevention, and attention to warning signs can improve outcomes.
For patients and families, the most important takeaway is simple: hemiarthroplasty is not just about replacing part of a hip. It is about restoring movement, reducing pain, and helping someone return to daily life with confidence, one steady step at a time.