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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
Published on: February 27, 2018
Femoral revision using long hydroxyapatite-coated interlocking stem
R Malhotra1, Aman Dua, E Krishna Kiran
1Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India. rmalhotra62@gmail.com
Archives of Orthopaedic and Trauma Surgery
|April 26, 2007
Summary
The IOTA interlocking femoral stem shows promising short-term results for hip revision surgery, offering good stability and bone ingrowth. However, surgeons should be aware of the potential for intraoperative fractures during implantation.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
Background:
- Cementless femoral revision surgery is gaining traction due to the potential for long-term biologic fixation.
- The IOTA interlocking femoral stem features hydroxyapatite coating and distal interlocking capabilities.
Purpose of the Study:
- To evaluate the short-term clinical outcomes of the IOTA interlocking stem in cementless femoral revision procedures.
Main Methods:
- A retrospective review of 18 total hip arthroplasties in 17 patients using the IOTA interlocking stem.
- Analysis of demographic data, revision indications, Harris Hip scores, allograft use, and bone deficiency (AAOS classification).
- Evaluation of intraoperative complications and radiographic outcomes using established criteria.
Main Results:
- Average patient age was 57 years, with varying degrees of bone deficiency (AAOS types I-IV).
- Significant improvement in mean Harris Hip score from 36 to 77 post-operatively.
- 83.33% bony ingrowth observed at a minimum 27-month follow-up; no stems required revision.
Conclusions:
- The IOTA interlocking stem demonstrates favorable short-term efficacy in femoral revisions, providing stability and promoting bone ingrowth.
- Hydroxyapatite coating contributes to consistent bone ingrowth.
- The stem's design offers a calcar replacement option, potentially reducing the need for allografts, but its straight nature presents a risk of intraoperative fracture.
