Total vs. Partial Hip Replacement: Key Differences and Which Is Right for You?

If a surgeon recommends hip replacement, the words “total” and “partial” can make the choice sound straightforward: replace the whole joint when damage is severe and only part of it when damage is less severe.

That is not how the decision usually works.

A total hip replacement (THR or THA) replaces both sides of the ball-and-socket joint: the damaged femoral head and the acetabular surface in the pelvis.

A partial hip replacement, medically called a hemiarthroplasty, replaces the femoral head but leaves the patient's natural acetabulum in place.

More importantly, these procedures are generally used for different clinical problems.

For a patient with advanced hip osteoarthritis affecting the joint surfaces, total hip replacement is usually the relevant replacement procedure. Partial hip replacement is used much more commonly for selected femoral-neck fractures, particularly in older adults, rather than as a routine alternative for someone with “less severe” arthritis. NHS guidance describes this same anatomical distinction, while NICE recommends either total hip replacement or hemiarthroplasty for appropriate displaced intracapsular hip fractures depending on the patient's health, mobility and expected functional needs.

So the right question is not simply:

“Which operation is smaller?”

It is:

“What is wrong with the hip, which parts of the joint are affected, and which reconstruction gives this patient the most appropriate balance of mobility, durability and surgical risk?”

This guide explains the difference between total vs. partial hip replacement, when each operation may be considered, how recovery differs and what patients should understand before making a treatment decision.

What Is a Total Hip Replacement?

A total hip replacement, also called total hip arthroplasty, replaces both major articulating surfaces of the hip.

The normal hip is a ball-and-socket joint:

• the femoral head forms the ball
• the acetabulum in the pelvis forms the socket

During total hip replacement, the damaged femoral head is removed and replaced with a prosthetic ball attached to a stem placed in the femur.

The damaged acetabular surface is also prepared and replaced with an artificial socket component.

The result is an artificial articulation between the new ball and new socket.

What Parts Are Replaced in Total Hip Replacement?

A typical total hip replacement includes:

• a femoral stem
• an artificial femoral head
• an acetabular shell
• an acetabular liner

Components may incorporate metal, ceramic or highly specialized plastic materials depending on the implant system and patient requirements.

NHS guidance describes total hip replacement as replacement of both the femoral head and the acetabular socket.

What Is a Partial Hip Replacement?

A partial hip replacement is usually referred to as hip hemiarthroplasty.

In this operation:

the femoral head is replaced, but the natural acetabulum is retained.

The artificial femoral head therefore moves against the patient's existing acetabular cartilage.

That is the fundamental anatomical difference.

Partial hip replacement should not be confused with:

• hip resurfacing
• hip-preservation surgery
• internal fixation of a hip fracture
• a “half-sized” total hip implant

These are different procedures with different indications.

Total vs. Partial Hip Replacement: Quick Comparison

The most important point is that these procedures are not simply interchangeable versions of the same operation.

Why Is Partial Hip Replacement Usually Used for Hip Fractures?

This is where many online explanations become misleading.

A partial hip replacement is particularly useful when the femoral head or femoral neck is no longer reliably salvageable, but the acetabular surface itself does not need routine replacement.

One of the most important examples is a displaced intracapsular femoral-neck fracture.

In an older adult, certain fractures through the femoral neck can disrupt the blood supply to the femoral head and make fixation less reliable.

In that situation, replacing the femoral head may provide a more predictable reconstruction than attempting to repair a badly displaced fracture.

NICE recommends replacement arthroplasty—either total hip replacement or hemiarthroplasty—for displaced intracapsular hip fractures. Which replacement is more suitable then depends on patient-specific factors.

If a fracture is the reason hip replacement is being discussed, patients can also review Dr. Ulhas Sonar's fracture and trauma surgery service for information about specialist fracture assessment and treatment planning.

Why Isn't Partial Hip Replacement Usually Used for Hip Arthritis?

Because arthritis is a disease of the joint, not simply the femoral head.

In advanced osteoarthritis, cartilage damage can involve:

• the femoral head
• the acetabular surface
• joint space
• surrounding bone

If only the femoral side were replaced while a painful arthritic acetabulum remained, the underlying socket disease would still be present.

That is why a patient with advanced osteoarthritis requiring joint replacement will generally be considered for total hip replacement, not hemiarthroplasty.

Dr. Ulhas Sonar's hip replacement surgery service in Pune specifically covers assessment and treatment for hip arthritis, avascular necrosis, hip fractures and other mobility-limiting hip conditions. The treatment pathway is determined according to the diagnosis, degree of joint damage, symptoms, bone quality and functional requirements.

When Is Total Hip Replacement Considered?

Total hip replacement may be considered when significant joint damage produces persistent symptoms and suitable non-operative treatment is no longer providing enough benefit.

Common situations include:

Advanced Hip Osteoarthritis

Osteoarthritis can progressively damage the cartilage covering both sides of the hip joint.

Symptoms may include:

• groin pain
• hip stiffness
• reduced walking distance
• difficulty climbing stairs
• pain getting into or out of a vehicle
• pain putting on shoes or socks
• disturbed sleep
• difficulty standing from a chair

When these symptoms substantially affect daily function and imaging confirms advanced joint damage, hip replacement may become appropriate.

Advanced Avascular Necrosis

Avascular necrosis, or AVN, occurs when the blood supply to the femoral head becomes compromised.

Early disease may sometimes be treated with joint-preserving strategies.

If the femoral head collapses and significant secondary joint damage develops, total hip replacement may be considered.

The clinic's hip replacement surgery service includes dedicated assessment for avascular necrosis and hip-preservation options before replacement is selected.

Inflammatory or Other Destructive Joint Disease

Other conditions can damage the hip severely enough to require joint replacement, depending on the individual diagnosis and symptoms.

Selected Femoral-Neck Fractures

Total hip replacement can also be used for certain displaced intracapsular hip fractures.

This is where the comparison with hemiarthroplasty becomes particularly important.

When Is Partial Hip Replacement Considered?

Partial replacement is especially associated with femoral-neck fractures.

It may be considered when:

• the fracture is displaced
• the femoral head is unlikely to be reliably preserved
• replacing the femoral side provides an appropriate reconstruction
• the patient's mobility and overall health favour hemiarthroplasty over total hip replacement

The decision is not based solely on chronological age.

A surgeon considers:

• mobility before the fracture
• independence
• medical fitness
• cognitive and functional status
• bone quality
• fracture pattern
• expected activity
• expected longevity and functional benefit
• surgical risk

NICE specifically advises considering total hip replacement rather than hemiarthroplasty for selected people with displaced intracapsular fractures who were independently mobile before the fracture, are medically suitable for the procedure and are expected to remain independently active beyond two years.

That recommendation illustrates why two patients with apparently similar hip fractures may appropriately receive different operations.

Total vs. Partial Hip Replacement for a Broken Hip

This is the clinical scenario in which the choice genuinely becomes THA versus hemiarthroplasty.

Suppose two patients both sustain displaced femoral-neck fractures.

Patient A

An independently mobile, active patient who regularly walks outdoors, lives independently and is medically fit for surgery may potentially benefit from total hip replacement.

Patient B

A frailer patient with lower pre-fracture mobility or significant medical comorbidity may be better served by hemiarthroplasty.

Neither operation is automatically “better.”

The choice is about matching the reconstruction to the patient's likely functional needs and surgical risk.

AAOS guidance similarly concludes that properly selected patients with displaced femoral-neck fractures may obtain a functional benefit from total hip arthroplasty compared with hemiarthroplasty, although this may come with increased complications.

Does Total Hip Replacement Give Better Function Than Partial Replacement?

The answer depends heavily on why the operation is being performed and who the patient is.

For advanced arthritis, hemiarthroplasty is generally not the competing procedure.

The meaningful comparison primarily arises in selected patients with displaced femoral-neck fractures.

For these fractures, total hip replacement may provide functional advantages in appropriately selected active patients.

However, hemiarthroplasty can have advantages of its own.

NICE's evidence review notes that hemiarthroplasty is generally a less complex operation and may be associated with factors such as lower dislocation risk and less blood loss in the hip-fracture population.

A large American Joint Replacement Registry analysis published in 2026 examined more than 65,000 Medicare patients treated for femoral-neck fractures and found no statistically significant difference in revision risk between several hemiarthroplasty and total-hip constructs over the study period. The authors emphasized that procedure selection should still be based on functional demand, comorbidities and other patient factors.

This reinforces an important point:

there is no single implant choice that is best for every fracture patient.

Is Partial Hip Replacement a Smaller or Easier Operation?

Anatomically, hemiarthroplasty replaces fewer joint surfaces.

But calling it simply an “easy version” of hip replacement is misleading.

Patients receiving hemiarthroplasty are often older adults who have sustained an acute hip fracture.

Their overall recovery may be influenced by:

• frailty
• osteoporosis
• medical conditions
• pre-fracture mobility
• balance
• muscle weakness
• cognitive function
• the effects of the fall itself

So although the surgical reconstruction may involve fewer joint surfaces, the patient's overall recovery is not necessarily easier.

The patient's physiological condition frequently matters more than the number of implant components.

What Are Unipolar and Bipolar Partial Hip Replacements?

Hemiarthroplasty implants can broadly be described as:

Unipolar Hemiarthroplasty

The prosthetic head moves primarily against the patient's natural acetabulum.

Bipolar Hemiarthroplasty

The prosthetic head incorporates an additional articulation within the implant.

Patients sometimes assume bipolar implants must automatically produce superior outcomes.

That is not necessarily supported by current guideline evidence.

AAOS guidance states that unipolar and bipolar hemiarthroplasty can be similarly beneficial for displaced femoral-neck fractures.

Implant choice should therefore be individualized by the treating surgeon.

Can a Partial Hip Replacement Later Be Converted to a Total Hip Replacement?

Yes, in selected cases.

Because hemiarthroplasty leaves the natural acetabulum intact, some patients may later develop problems such as:

• acetabular cartilage wear
• persistent groin pain
• implant-related problems
• infection
• loosening
• instability
• other mechanical complications

If the natural socket becomes problematic, conversion to total hip replacement may sometimes be considered.

However, conversion surgery is not simply the same as a routine first-time total hip replacement.

Previous surgery, bone quality and existing implants can make the procedure more complex.

The decision therefore requires careful assessment.

Is Total Hip Replacement More Durable?

It is tempting to compare the two procedures using a single lifespan figure, but this can be misleading.

A total hip replacement is designed to reconstruct both sides of the joint and is commonly used for long-term treatment of advanced arthritis.

A hemiarthroplasty is often performed in an entirely different population—frequently older adults after hip fracture.

Therefore, comparing “how many years each lasts” without considering the reason for surgery and patient group does not provide a clinically meaningful answer.

Durability is affected by:

• implant type
• fixation
• bone quality
• activity level
• age
• body weight
• surgical positioning
• infection
• dislocation
• wear
• fracture around the implant

The better question is whether the selected implant is appropriate for the expected demands of that patient.

Risks of Total Hip Replacement

Total hip replacement is a well-established procedure, but like any major operation it carries risks.

Potential complications include:

• infection
• blood clots
• bleeding
• dislocation
• fracture around the implant
• leg-length difference
• nerve or blood-vessel injury
• implant loosening or wear
• persistent pain
• need for revision surgery

An individual's risk depends on health, age, bone quality and other clinical factors.

Patients who have been advised to undergo a major orthopaedic operation but remain uncertain about the diagnosis or procedure can also seek a second opinion for orthopaedic surgery before making a final decision.

Risks of Partial Hip Replacement

Hemiarthroplasty shares many of the general risks associated with hip replacement, including:

• infection
• blood clots
• dislocation
• periprosthetic fracture
• anaesthetic complications
• persistent pain
• implant-related problems

It also has an important longer-term consideration:

Acetabular Wear

Because the prosthetic femoral head continues to articulate with the patient's natural socket, the acetabular cartilage can sometimes deteriorate.

This is one reason total hip replacement may be preferred in appropriately selected, more active fracture patients expected to place greater long-term demands on the hip.

However, total replacement can itself involve a more extensive reconstruction and potentially different complication profile.

The choice remains a trade-off rather than a simple ranking.

Which Surgery Has a Higher Dislocation Risk?

In the specific setting of femoral-neck fracture, total hip replacement may carry a greater dislocation risk than hemiarthroplasty in some patient groups.

This is one factor considered when choosing between the procedures.

However, dislocation risk is influenced by more than whether the operation is “total” or “partial.”

It can also depend on:

• surgical approach
• implant design
• component positioning
• muscle function
• neurological conditions
• patient compliance with precautions
• previous surgery

Therefore, individual risk assessment is more meaningful than quoting one universal percentage.

Which Procedure Has a Faster Recovery?

There is no responsible answer that says:

“partial always recovers faster.”

The comparison is distorted because the two procedures are often performed on very different patients.

A planned elective total hip replacement for osteoarthritis may be performed on someone who is otherwise medically fit and prepared for surgery.

A hemiarthroplasty may occur unexpectedly after an elderly patient falls, sustains a fracture and is admitted to hospital.

Recovery after either operation depends on:

• health before surgery
• reason for surgery
• muscle strength
• pre-operative mobility
• pain
• fracture-related trauma
• weight-bearing instructions
• medical complications
• confidence and balance
• rehabilitation

Structured hip replacement rehabilitation can include walking support, hip strengthening, balance training, mobility work and gradual return to normal activity.

How Soon Can You Walk After Hip Replacement?

Mobilisation usually begins early when medically and surgically appropriate.

For hip-fracture patients, NICE recommends physiotherapy assessment and mobilisation on the day after surgery unless there is a contraindication.

The precise amount of weight that can be placed through the leg depends on:

• operation performed
• implant fixation
• bone quality
• associated injury
• surgeon's instructions

Patients should follow their own postoperative plan rather than copying another patient's recovery timeline.

Do You Need Physiotherapy After Both Procedures?

Yes, rehabilitation is important after both.

The objectives may include:

• safe transfers
• standing
• walking
• restoring hip strength
• improving balance
• reducing fall risk
• rebuilding confidence
• returning to daily activities

However, rehabilitation must reflect why surgery was performed.

A patient recovering from elective total hip replacement for arthritis may have different priorities from an older adult recovering from a fracture and hemiarthroplasty.

Dr. Ulhas Sonar's physiotherapy, rehabilitation and recovery planning service specifically includes hip-replacement and fracture rehabilitation in Pune.

Does Every Patient With Hip Arthritis Need Total Hip Replacement?

No.

An X-ray showing arthritis does not automatically mean surgery is required.

Treatment decisions should consider:

• severity of pain
• walking limitation
• stiffness
• daily function
• response to previous treatment
• radiographic joint damage
• age and health
• individual goals

Earlier or less severe symptoms may sometimes be managed with:

• activity modification
• appropriate exercise
• physiotherapy
• pain-management strategies
• weight management where appropriate
• selected injections
• hip-preservation assessment in suitable conditions

The live hip replacement surgery service similarly emphasizes that not every patient with hip pain requires surgery and includes non-operative and hip-preservation assessment before replacement when appropriate.

Hip replacement becomes relevant when the underlying joint disease and its impact on function justify replacing the joint.

Can Hip Replacement Be Avoided in Avascular Necrosis?

Sometimes, particularly when AVN is identified before substantial collapse of the femoral head.

Treatment depends on:

• stage of AVN
• size and location of the affected area
• whether collapse has occurred
• condition of the acetabulum
• symptoms
• age
• activity requirements

Once there is advanced collapse and secondary joint destruction, joint replacement may become the more appropriate treatment.

This is why early hip-preservation assessment can be valuable in selected younger or active patients rather than assuming replacement is inevitable.

Does Age Decide Between Total and Partial Hip Replacement?

No.

Age matters, but it does not operate as a single cut-off.

For fracture patients, surgeons consider biological fitness and functional demand as well as chronological age.

Two people aged 75 can have completely different needs.

One may:

• walk several kilometres independently
• live alone
• travel
• exercise regularly
• have few major medical conditions

Another may:

• require assistance to walk
• have multiple medical problems
• have limited pre-fracture mobility
• require substantial support with daily activities

Their most appropriate operation may therefore differ even though their ages are identical.

This is why current guidelines emphasize mobility, medical suitability and expected future independence, not age alone.

How Does a Surgeon Decide Between Total and Partial Hip Replacement?

For a femoral-neck fracture, the decision usually draws on several variables rather than one test.

1. Fracture Pattern

Is the fracture displaced?

Can the femoral head reasonably be preserved?

Would fixation be appropriate, or is replacement more reliable?

2. Condition of the Acetabulum

Does the natural socket need replacement?

3. Mobility Before the Injury

Was the patient independently mobile outdoors?

Were walking aids required?

4. General Health

Can the patient tolerate the additional demands of the proposed operation?

5. Functional Expectations

How much activity is the patient realistically expected to regain?

6. Cognitive and Neurological Factors

Can these increase dislocation risk or alter rehabilitation requirements?

7. Bone Quality

Poor bone quality can affect implant selection and fixation strategy.

8. Long-Term Benefit

Will replacing the acetabulum provide meaningful functional benefit over the expected period of use?

Good decision-making therefore combines fracture anatomy + joint condition + patient physiology + functional goals.

Hip Replacement Assessment in Pune

For patients considering hip replacement surgery in Pune, the first objective should be identifying the condition that is actually producing the pain or loss of mobility.

Dr. Ulhas Sonar is a consultant orthopaedic surgeon whose published clinical profile includes experience in partial and total joint replacement, complex trauma and joint-preservation techniques.

His hip replacement surgery service in Pune includes evaluation of:

• hip arthritis
• avascular necrosis
• hip fractures
• persistent hip and groin pain
• reduced walking ability
• previous hip replacement problems
• hip-preservation possibilities
• total hip replacement
• complex and revision hip replacement

A proper hip consultation should answer four practical questions:

What is causing the hip problem?

Does the joint actually need replacing?

If replacement is necessary, which parts need to be replaced?

Which operation best matches the patient's health, mobility and long-term goals?

Patients who have already been advised to undergo an operation but remain uncertain can also request a second opinion for orthopaedic surgery or book an orthopaedic consultation in Pune.

Total vs. Partial Hip Replacement

The most useful way to understand total vs. partial hip replacement is to stop thinking of them as large and small versions of the same surgery.

They solve different problems.

A total hip replacement reconstructs both sides of the joint and is the established replacement procedure when advanced arthritis or other destructive joint disease has damaged the ball-and-socket articulation.

A partial hip replacement preserves the natural acetabulum and replaces the femoral head. Its most important modern role is in selected femoral-neck fractures, particularly when replacing the damaged femoral head is more appropriate than trying to preserve it.

When a hip fracture could reasonably be treated with either procedure, the choice becomes more individual.

An independently mobile, medically fit patient with substantial long-term functional expectations may benefit from total hip replacement. A patient with different health, mobility and risk considerations may be better suited to hemiarthroplasty.

That means the operative decision should not be driven by:

“Which procedure sounds less invasive?”

It should be driven by:

the diagnosis, fracture pattern, condition of the acetabulum, bone quality, pre-injury mobility, medical fitness and the level of function the patient needs after recovery.

For patients in Pune who have been told they may need hip replacement—whether for arthritis, avascular necrosis or a hip fracture—the most important step is an individualized assessment that explains why replacement is being considered and why one specific reconstruction is more appropriate than the alternatives.

That is the distinction that turns “total vs. partial hip replacement” from a procedural comparison into a meaningful treatment decision.