Heterotopic bone in hip arthroplasties. Cemented versus noncemented

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Radiology

Background:

• Heterotopic bone formation (HBF) is a common complication following hip arthroplasty.
• Understanding risk factors for HBF is crucial for improving patient outcomes and surgical techniques.

Purpose of the Study:

• To investigate the incidence and risk factors of heterotopic bone formation (HBF) after hip arthroplasty.
• To compare HBF rates between cemented and noncemented hip arthroplasty procedures.
• To identify other factors influencing HBF, including surgical approach, patient demographics, and medications.

Main Methods:

• Retrospective review of 66 hip arthroplasties in 55 patients.
• Analysis of cemented versus noncemented procedures.
• Evaluation of surgical approaches, medications, diagnoses, range of motion, and pain.
• Assessment of heterotopic ossification (HO) using imaging.

Main Results:

• Overall incidence of heterotopic ossification was 64%.
• No significant difference in HBF between cemented (67%) and noncemented (55%) procedures.
• Trochanteric osteotomy was associated with a higher HBF rate (80%).
• Male osteoarthritic patients showed the highest HBF; 80% recurrence with contralateral surgery.
• All patients with gout (100%) developed HBF; resurfacing arthroplasty linked to severe HBF.
• Decreased range of motion correlated with more severe HBF.

Conclusions:

• Cemented versus noncemented procedures do not significantly impact HBF rates.
• Specific surgical approaches (trochanteric osteotomy) and patient factors (gout, male osteoarthritics) are associated with increased HBF.
• Severe HBF can lead to decreased range of motion, particularly with resurfacing arthroplasty.