Baumer

26/03/26

Acetabular Components in Hip Arthroplasty: Clinical Indication, Engineering, and Consistent Performance

Total hip arthroplasty is one of the most successful surgeries in modern orthopedics, supported by continuous advances in materials engineering, osseointegration surfaces, and implant modularity. In this context, innovation is not restricted to a single concept, but rather to the ability to offer suitable solutions for different patient profiles, respecting biomechanical, anatomical, and functional criteria.

Uncemented acetabular components remain widely used in global clinical practice, both in primary arthroplasties and in selected revision scenarios. Their application is especially relevant in patients with good bone quality, where biological fixation, associated with adequate primary stability, provides predictable and lasting results. Furthermore, these systems are highly competitive in the international market, being widely adopted due to their clinical efficiency, technical reproducibility, and excellent cost-benefit ratio.

Within this context, the A-Lock and Century II acetabular components, along with their respective acetabular inserts, position themselves as modern, technically sound solutions aligned with the current demands of hip arthroplasty. Throughout this article, their indications, clinical applications, and engineering advantages will be discussed, always from the perspective of the surgeon's decision-making process.

Delve deeper into the technical principles of Baumer acetabular components and gain access to exclusive materials to support your clinical decision.

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Clinical experience, applied engineering and a consolidated history

With over 70 years of experience in orthopedics and decades dedicated to developing hip solutions, Baumer has built its expertise from real clinical practice and continuous field validation. This experience has allowed for the progressive improvement of its systems, always focusing on mechanical stability, biological fixation and bone preservation.

The A-Lock and Century II acetabular components are the result of this technical trajectory. Both were designed to meet the biomechanical demands of the hip joint, respecting fundamental parameters such as restoration of the center of rotation, homogeneous load distribution and reduction of micromovements at the implant-bone interface.

Before detailing each system, it is important to highlight its main indications and clinical applications, which guide the rational and personalized choice of implant.

Indications and clinical applications – overview

In summary, the A-Lock and Century II acetabular components, together with their acetabular inserts, are primarily indicated for:

Primary total hip arthroplasty;

Patients with good bone quality for biological fixation;

Primary and secondary osteoarthritis;

Post-traumatic osteoarthritis;

Avascular necrosis of the femoral head;

Sequelae of hip dysplasia;

Selected revision situations, according to bone bed assessment.

These applications will be detailed below, focusing on the specific characteristics of each system.

A-Lock System: primary stability and fixation versatility

The A-Lock acetabular component was developed to provide high primary stability, a determining factor for successful osseointegration. Its hemispherical design, combined with the over ring and radial fins, promotes efficient circumferential interference, reducing micromovements immediately after impaction.

The external coating in Plasma Porous favors long-term biological fixation, while the conventional, multi-hole, and multi-hole locked versions expand the possibilities for additional mechanical anchorage with screws, especially in patients with borderline bone quality.

Acetabular inserts compatible with the A-Lock system are available in conventional UHMWPE polyethylene, crosslinked, and crosslinked with Vitamin E, with neutral (0°) and dysplastic (10°) angulation options. This combination contributes to greater durability of the assembly, reduced wear, and adaptation to the patient's biomechanical needs.

Century II: predictability, modularity, and ease of positioning

The Century II is a non-cemented acetabular component indicated primarily for primary total hip arthroplasties. Its hemispherical profile and the possibility of component rotation facilitate intraoperative positioning, favoring fine adjustment of acetabular orientation.

The external surface coated with Plasma Porous optimizes osseointegration, while the conical key system ensures secure locking between The metallic component and the acetabular insert minimize micromovements and the formation of polymeric debris. The Century II is available with one or three holes for additional fixation with bone screws, as clinically needed.

The acetabular inserts follow the same standard of advanced materials, with options in crosslinked polyethylene and crosslinked with Vitamin E, reinforcing the system's durability and long-term reliability.

Dual Mobility: Specific Indication for More Complex Scenarios

The A-Lock and Century II systems are not dual-mobility implants, their applicability being indicated for the clinical scenarios described above. Dual mobility has well-established indications and is particularly recommended in highly complex cases, such as:

Patients with a high risk of instability or dislocation;

Neuromuscular diseases;

Complex revisions with significant soft tissue involvement;

History of multiple dislocations;

Situations where joint stability control is a central challenge.

In contrast, in most primary arthroplasties and in several revision scenarios, traditional uncemented acetabular components, when correctly indicated and well-positioned, offer excellent clinical performance, with predictable and lasting results.

Would you like to discuss the most appropriate indication among A-Lock, Century II, or other solutions for your patient profile? Talk to a Baumer specialist.

Clinical performance supported by experience

The choice of acetabular component should balance engineering, clinical indication, and history of results. The A-Lock and Century II systems reflect decades of technical development, clinical validation, and continuous improvement, offering the surgeon reliable, competitive solutions aligned with international practices.

More than implants, they represent a philosophy based on correct indication, predictability, and trust built over time.

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