Hip arthroplasty today and tomorrow

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering
• Medical Device Design

Background:

• Acrylic-fixed total hip arthroplasty (THR) and surface replacement arthroplasty are established procedures for hip joint restoration.
• Improvements in surgical technique, implant materials, and device design have significantly reduced complication rates.
• While highly effective in the elderly, high failure rates in younger patients and those with bone stock deficiencies necessitate ongoing innovation.

Purpose of the Study:

• To review the effectiveness and evolving trends in acrylic-fixed and cementless hip replacement arthroplasty.
• To evaluate the performance of various femoral and acetabular component designs.
• To identify future directions in hip replacement technology for improved patient outcomes.

Main Methods:

• Review of current literature and clinical outcomes of acrylic-fixed and cementless hip arthroplasty.
• Analysis of femoral stem designs, including "macro" and "micro" porous options.
• Evaluation of acetabular component designs, focusing on cementless hemispherical and cylinder types.

Main Results:

• Acrylic-fixed stem designs remain the preferred choice for the elderly due to low failure rates.
• Newer femoral designs show potential but face challenges like thigh pain and unpredictable bone ingrowth.
• Cementless press-fit stems and porous surface replacements demonstrate promising initial results with reduced risks.
• Certain cementless acetabular designs achieve good short-term outcomes, while screw ring types are less successful.

Conclusions:

• Continued refinement of surgical techniques and tailored implant selection for specific bone stock conditions are crucial.
• Emerging bearing materials like ceramic-ceramic and ceramic-polyethylene offer potential for reduced wear and enhanced implant longevity.
• Future research should focus on optimizing implant fixation and wear characteristics for long-term durability.