A proximally coated beaded stem minimum 5-year follow-up

Area of Science:

• Orthopedic surgery
• Biomaterials engineering
• Medical device evaluation

Background:

• Total hip arthroplasty (THA) is a common procedure for hip joint disease.
• Uncemented femoral stems aim for biological fixation through bone ingrowth.
• Proximal surface modifications are designed to enhance initial stability and long-term osseointegration.

Purpose of the Study:

• To report the minimum 5-year clinical and radiographic outcomes of a specific proximally beaded femoral stem.
• To assess the rate of bone ingrowth, stability, and clinical performance of this uncemented hip implant.
• To evaluate proximal bone preservation and identify any failure modes.

Main Methods:

• Prospective evaluation of 159 primary uncemented total hip arthroplasties in 153 patients.
• Clinical assessment using prospectively determined criteria.
• Radiographic analysis to evaluate femoral stem fixation (bone ingrowth and stability per Engh criteria).

Main Results:

• 97% of femoral stems achieved bone ingrowth and stability according to Engh criteria at minimum 5-year follow-up.
• Five femoral revisions were performed: 2 for subsidence, 2 for loosening, and 1 for a broken trunion.
• The proximally beaded stem demonstrated reliable clinical function and proximal bone preservation.

Conclusions:

• The proximally beaded femoral stem shows a high rate of successful bone ingrowth and stability in primary total hip arthroplasty.
• This implant design offers reliable clinical outcomes and promotes proximal bone preservation at a minimum 5-year follow-up.
• Further long-term studies are warranted to confirm durability and address specific revision causes.