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Introduction <p>Short, collared, metaphyseal-filling femoral stems preserve proximal bone and achieve stable fixation while reducing stress shielding compared to diaphyseal-engaging stems. Early six-month data for one such stem demonstrated improved patient-reported outcomes with no implant-related complications. This study extends follow-up of the same cohort to a minimum of two years to evaluate (a) functional outcomes, (b) implant-related complications, and (c) survivorship.</p> Materials and methods <p>The prospective cohort of 120 patients underwent robotic-arm assisted total hip arthroplasty (THA) through a direct anterior approach (DAA) using a short, collared, metaphyseal-filling stem. Patients had a mean age of 69.2 years (range 37–90) and a body mass index of 28.2 (range 18.1–49.1), and they were 71% women and were followed for a mean of 2.6 years (range 2.0–3.4). The Hip Disability and Osteoarthritis Outcome Score for Joint Replacement (HOOS-JR) was compared with baseline using Student’s <i>t-</i>tests. Complications included all-cause revision, periprosthetic joint infection, periprosthetic fracture, and dislocation at final follow-up.</p> Results <p>At mean follow-up, HOOS-JR scores improved from a mean of 54.5 ± 13.9 preoperatively to 94.4 ± 10.3 (<i>P</i> &lt; 0.001). The overall survivorship was 98.1% following two septic revisions.</p> Conclusions <p>This short, collared, metaphyseal-filling stem demonstrated sustained functional improvements and low implant-related complication rates of the prior six-month follow-up through a minimum of two years. These results support the continued clinical efficacy and stability of the implant in robotic-arm assisted DAA THA.</p>

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Robotic-arm assisted total hip arthroplasty using a short metaphyseal filling collared femoral implant through a direct anterior approach: minimum two-year outcomes

  • 期刊论文

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  • 发表日期：

    2026年5月7日

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  • Robert Marchand,
  • Emily Kaczynski,
  • Kelly Taylor,
  • Chase Smitterberg,
  • Michael A. Mont

摘要

Introduction

Short, collared, metaphyseal-filling femoral stems preserve proximal bone and achieve stable fixation while reducing stress shielding compared to diaphyseal-engaging stems. Early six-month data for one such stem demonstrated improved patient-reported outcomes with no implant-related complications. This study extends follow-up of the same cohort to a minimum of two years to evaluate (a) functional outcomes, (b) implant-related complications, and (c) survivorship.

Materials and methods

The prospective cohort of 120 patients underwent robotic-arm assisted total hip arthroplasty (THA) through a direct anterior approach (DAA) using a short, collared, metaphyseal-filling stem. Patients had a mean age of 69.2 years (range 37–90) and a body mass index of 28.2 (range 18.1–49.1), and they were 71% women and were followed for a mean of 2.6 years (range 2.0–3.4). The Hip Disability and Osteoarthritis Outcome Score for Joint Replacement (HOOS-JR) was compared with baseline using Student’s t-tests. Complications included all-cause revision, periprosthetic joint infection, periprosthetic fracture, and dislocation at final follow-up.

Results

At mean follow-up, HOOS-JR scores improved from a mean of 54.5 ± 13.9 preoperatively to 94.4 ± 10.3 (P < 0.001). The overall survivorship was 98.1% following two septic revisions.

Conclusions

This short, collared, metaphyseal-filling stem demonstrated sustained functional improvements and low implant-related complication rates of the prior six-month follow-up through a minimum of two years. These results support the continued clinical efficacy and stability of the implant in robotic-arm assisted DAA THA.