Bipolar Hip Replacement: Procedure, Benefits and Recovery

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Hip replacement surgery can help reduce hip pain and improve movement when the joint is badly damaged. Bipolar hip replacement is a type of partial hip replacement. It is mainly used when the femoral head is damaged but the natural hip socket is still in reasonably good condition.

The choice of hip replacement depends on the cause of the hip problem, bone quality, age, activity level, overall health and condition of the hip socket. An orthopaedic surgeon will assess these factors before recommending the most suitable procedure.

What Is Bipolar Hip Replacement?

Bipolar hip replacement is a type of partial hip replacement, also called hemiarthroplasty. During the procedure, the damaged femoral head is replaced with a prosthetic implant, while the natural acetabulum (hip socket) is preserved.

The bipolar implant has two areas of movement. One is between the prosthetic head and its inner liner, and the other is between the outer surface of the implant and the patient's natural hip socket.

It is commonly used for certain femoral neck fractures, especially in older adults. It may also be considered in selected patients when the hip socket is not significantly damaged. Bipolar hip replacement is different from total hip replacement, in which both the femoral head and the acetabulum are replaced.

What Is the Difference Between Bipolar and Unipolar Hip Replacement?

Both bipolar and unipolar hip replacements replace the femoral head while keeping the natural hip socket. The main difference is the design of the prosthetic head.

Bipolar Hip Replacement

A bipolar implant has an inner articulation within the prosthesis as well as movement between the implant and the natural socket.

Possible advantages include:

Bipolar implants are not the same as modern dual-mobility total hip implants. These are different implant designs used for different surgical indications.

Unipolar Hip Replacement

A unipolar hemiarthroplasty uses a single prosthetic head that moves directly against the patient's natural hip socket.

The choice between a bipolar and unipolar implant depends on factors such as:

There is no single implant that is best for every patient.

What Is the Difference Between Bipolar and Total Hip Replacement?

Bipolar hip replacement and total hip replacement are different procedures. The main difference is whether the natural hip socket is replaced.

Bipolar Hip Replacement

In bipolar hip replacement, only the femoral head is replaced. The natural acetabulum is left in place. It may be suitable for selected patients, particularly older adults with certain femoral neck fractures and a relatively healthy hip socket.

Total Hip Replacement

In total hip replacement, both parts of the damaged joint are replaced:

Total hip replacement is commonly used for conditions such as severe arthritis, advanced joint damage, and some other painful hip conditions.

The recovery period varies from person to person. Bipolar surgery may involve a shorter operation or hospital stay in some patients, but recovery also depends on age, general health, mobility before surgery and rehabilitation.

What Anaesthesia Is Used for Bipolar Hip Replacement?

The anaesthesiologist decides which type of anaesthesia is safest and most suitable after reviewing the patient's health, medicines, allergies, age, and the planned surgery. Common options include general anaesthesia and regional anaesthesia.

What Is General Anaesthesia?

General anaesthesia puts the patient into a controlled state of unconsciousness during surgery.

It may involve:

Some people may experience temporary nausea, drowsiness, sore throat, or confusion after general anaesthesia.

What Is Regional Anaesthesia?

Spinal anaesthesia is commonly used for lower-body surgery, including many hip operations. It numbs the lower part of the body while the patient remains awake or receives sedation.

Possible benefits include:

The choice depends on the patient's health and the anaesthesiologist's assessment. Regional anaesthesia is not automatically better or safer for everyone.

What Are the Surgical Approaches for Bipolar Hip Replacement?

The surgeon chooses the surgical approach based on the patient's anatomy, hip condition, previous surgery, and the surgeon's experience. Common approaches include posterior, anterior and lateral approaches.

What Is the Posterior Approach?

In the posterior approach, the surgeon reaches the hip joint through an incision at the back of the hip. It provides good access to the joint and is widely used for hip replacement surgery. Patients may receive specific movement precautions after surgery depending on the surgical technique and their individual risk of dislocation.

What Is the Anterior Approach?

The anterior approach reaches the hip joint through the front of the hip. The surgeon works between muscles and tissues to access the joint. Some patients may have less disruption of certain muscles, but the approach requires specific surgical training and is not suitable for everyone. Recovery depends on several factors and cannot be guaranteed to be faster simply because the anterior approach is used.

What Is the Lateral Approach?

The lateral approach reaches the hip joint through the side of the hip. It provides good access to the joint and may be used in selected patients. Recovery focuses on gradually improving strength, balance, walking and hip function. Each approach has its own benefits and possible risks. The surgeon can explain which approach is appropriate for the individual patient.

What Are the Benefits of Bipolar Hip Replacement?

The benefits of bipolar hip replacement depend on the patient's condition and the reason for surgery. Potential benefits include:

Bipolar hip replacement is not automatically the best option for every patient. If the hip socket is also badly damaged, total hip replacement may provide a better long-term solution.

What Are the Risks of Bipolar Hip Replacement?

Like any major surgery, bipolar hip replacement has possible risks. These may include:

The risk varies based on age, health, the reason for surgery, implant type, and other individual factors.

What Is Recovery Like After Bipolar Hip Replacement?

Recovery is different for each person. Older adults may need additional support after surgery, especially if they had limited mobility before the operation.

Recovery may include:

The healthcare team will explain when it is safe to return to specific activities. Following the rehabilitation plan can help improve mobility and reduce the risk of complications.

Conclusion

Bipolar hip replacement is a type of partial hip replacement in which the damaged femoral head is replaced while the natural hip socket is preserved. It is commonly considered for selected patients, particularly older adults with certain femoral neck fractures.

The choice between bipolar, unipolar and total hip replacement depends on the condition of the hip, the patient's health, activity level, and other factors. Anaesthesia and surgical approach are also selected according to individual needs. A detailed assessment by an orthopaedic surgeon can help determine whether bipolar hip replacement is appropriate and what recovery may look like.