Heterotopic ossification following total hip arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Radiology

Background:

• Heterotopic ossification (HO) is a common radiographic finding after total hip arthroplasty (THA).
• While often asymptomatic, HO can become clinically significant, causing pain and potentially requiring revision surgery.
• Identifying at-risk patients is crucial for effective management.

Purpose of the Study:

• To review the incidence, risk factors, and management strategies for heterotopic ossification following total hip arthroplasty.
• To discuss prophylactic measures and the timing of surgical intervention for symptomatic HO.

Main Methods:

• Review of current literature on heterotopic ossification after total hip arthroplasty.
• Discussion of risk factors including ankylosing spondylitis, skeletal hyperostosis, and previous HO.
• Evaluation of prophylactic treatments: low-dose radiation and nonsteroidal anti-inflammatories (NSAIDs).

Main Results:

• Careful surgical technique may reduce HO incidence.
• Prophylaxis is indicated for high-risk patients.
• Both radiation and NSAIDs (e.g., Indomethacin) are effective prophylactic options, with selection based on patient factors and treatment availability.

Conclusions:

• Prophylaxis is essential for patients at risk of developing symptomatic heterotopic ossification after total hip arthroplasty.
• The choice between radiation and NSAIDs depends on individual patient circumstances and treatment logistics.
• Surgical excision of symptomatic HO should be considered only after 6-12 months when the bone formation is mature, potentially guided by bone scans.