Similar 2 year migration patterns for a shortened and a distally reduced stem design in uncemented total hip arthroplasty: a randomized controlled trial using radiostereometric analysis.
Lennard Koster, Bart L Kaptein, Esmeralda Goorden et al.
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In 30 seconds
This randomized controlled trial evaluated the migration patterns of two uncemented hip stem designs—Microplasty and Reduced Distal—over two years in 50 patients undergoing minimally invasive anterior-supine total hip arthroplasty. Results indicated comparable subsidence and retroversion, with mean values at 2 years of 1.47 mm and 2.57° for Microplasty, and 2.35 mm and 1.59° for Reduced Distal, suggesting no clinically significant differences between the designs.
Key findings
- Mean subsidence at 2 years was 1.47 mm for Microplasty and 2.35 mm for Reduced Distal.
- Mean retroversion at 2 years was 2.57° for Microplasty and 1.59° for Reduced Distal.
- Initial migration was comparable between both stem designs, stabilizing after 6 weeks.
- No clinically significant differences in secondary outcomes were observed between the designs.
Why it matters
Understanding the migration patterns of different hip stem designs can inform surgical decisions and patient management in total hip arthroplasty, potentially impacting long-term outcomes and implant stability.