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Heterotopic ossification after total hip arthroplasty: When is development completed?
Roland E Willburger1, Friederike Brinkhoff1, Jan Nottenkämper1
1Department of Orthopaedic Surgery, Martin-Luther-Krankenhaus, Voedestrasse 79, 44866, Bochum, Germany.
Heterotopic ossification (HO) formation after total hip arthroplasty (THA) is completed within 3 years. After this period, new HO or progression suggests other causes like infection or trauma.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Clinical Research
Background:
- Heterotopic ossification (HO) is a frequent complication following total hip arthroplasty (THA).
- Nonsteroidal anti-inflammatory drugs are effective in reducing HO incidence.
- The exact timeline for HO formation completion post-THA remains unclear.
Purpose of the Study:
- To determine the time point at which heterotopic ossification (HO) formation is completed after total hip arthroplasty (THA).
Main Methods:
- Prospective study of 75 patients undergoing THA, with a minimum 10-year life expectancy.
- Periarticular HO assessed via clinical and radiological examinations at 3 months, 1, 3, 5, and 10 years postoperatively.
- HO graded using Brooker's method; patients received ossification prophylaxis with etoricoxib.
Main Results:
- Low-grade HO (Brooker grades I and II) was more frequent than high-grade HO (grade III).
- HO progression was observed within the first 3 years postoperatively in patients with existing HO.
- HO formation was complete in all patients by the 3-year postoperative mark.
Conclusions:
- Heterotopic ossification formation following THA is definitively complete by 3 years postoperatively.
- Post-3-year HO occurrence or progression warrants investigation for alternative causes, including trauma, infection, or implant loosening.
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