Shree Balaji Enterprises

Bipolar hemiarthroplasty (BHA) is a surgical treatment for femoral neck fractures of the hip. An artificial joint with two bearings replaces the damaged joint. The bearings allow the head to swivel during movement, preventing wear and tear on the hip joint.

A bipolar hip prosthesis is a specialized orthopedic implant designed for partial hip replacement in patients with femoral head fractures, osteonecrosis, or degenerative hip conditions. This implant is widely used in hemiarthroplasty procedures, particularly in elderly patients with displaced femoral neck fractures, where total hip replacement is not necessary.
The bipolar design consists of two articulating components—a mobile inner head that rotates within a larger outer shell—which provides enhanced stability, reduced acetabular wear, and greater range of motion compared to traditional unipolar implants. This structure allows controlled movement between the femoral head and acetabulum, minimizing friction and preserving native bone.
Design and Components1. Outer Shell (Acetabular Component)Made from high-grade stainless steel or titanium, this smooth, polished shell articulates with the patient’s natural acetabulum.Reduces direct pressure on the acetabular cartilage, thereby prolonging joint integrity.
2. Inner Head (Mobile Component)Typically crafted from cobalt-chromium alloy or ceramic, it sits inside the outer shell, providing dual mobility to reduce impact and wear.
Available in various sizes to ensure optimal fit and biomechanical alignment.
3. Femoral StemDesigned from biocompatible stainless steel or titanium, the femoral stem is cemented or press-fitted into the femoral canal for long-term fixation.
Engineered to match the patient’s anatomy, ensuring a stable and secure fixation.
Key Features of Bipolar Hip ProsthesisDual Articulation MechanismThe inner head moves independently within the outer shell, allowing for smooth, controlled movement while reducing stress on the native acetabulum.

Reduced Acetabular ErosionUnlike unipolar implants, bipolar prostheses distribute forces more efficiently, preventing excessive wear of the acetabulum.

Improved Range of MotionThe prosthesis allows for a greater arc of movement, promoting natural hip function and early mobilization.

Enhanced StabilityThe design reduces dislocation risk by improving congruency between the femoral head and acetabulum.

Modular Sizing OptionsAvailable in multiple sizes, ensuring patient-specific customization and optimal biomechanical reconstruction.
Clinical ApplicationsA bipolar hip prosthesis is used primarily in:
1. Femoral Neck FracturesIdeal for elderly patients with displaced fractures, providing a durable and functional replacement.
2. Avascular Necrosis (Osteonecrosis)Helps restore joint function when the femoral head is severely compromised.
3. Hip Arthritis (Degenerative Joint Disease)Used in limited cases where only the femoral head is affected, avoiding total hip replacement.
4. Oncology & Tumor CasesSuitable for proximal femoral reconstructions after tumor resections.
Advantages of Bipolar Hip Prosthesis
✔ Preserves the Natural Acetabulum – The mobile inner head reduces wear on the hip socket, extending implant longevity.✔ Minimizes Dislocation Risks – The dual articulation provides better stability, reducing implant failure risks.✔ Better Load Distribution – The implant design reduces pressure points, minimizing bone resorption and loosening.✔ Faster Rehabilitation – Patients experience less pain, quicker mobilization, and improved functionality post-surgery.✔ Long-Term Durability – Made from high-strength biocompatible materials, ensuring longevity and structural integrity.

A bipolar hip prosthesis is used to treat femoral neck fractures and osteoarthritis. It's a surgical procedure that replaces half of the hip joint with a prosthetic.