Patterns of osteolysis around total hip components inserted with and without cement

Area of Science:

• Orthopedic Surgery
• Biomaterials Science

Background:

• Total hip arthroplasty (THA) is a common procedure for hip joint issues.
• Osteolysis, bone loss around implants, is a significant complication.
• The fixation method of acetabular components (cemented vs. uncemented) may influence osteolysis.

Purpose of the Study:

• To compare the incidence and characteristics of acetabular osteolysis between cemented and uncemented porous-coated acetabular components in THA.
• To evaluate the association between osteolysis patterns and component loosening.

Main Methods:

• Radiographic review of 137 patients (137 hips) undergoing THA with porous-coated femoral components.
• Categorization of acetabular components into cemented (Group A, n=63) and uncemented (Group B, n=74).
• Assessment for osteolysis and component loosening at a mean follow-up of 105 months.

Main Results:

• Acetabular osteolysis occurred in 37% of unrevised cemented cups, frequently linear and associated with 30% loosening.
• Acetabular osteolysis occurred in 18% of unrevised uncemented cups.
• Uncemented cups showed less osteolysis than cemented cups (p < 0.05), with localized, expansile osteolysis not linked to loosening but causing greater bone loss.

Conclusions:

• Cemented acetabular components in THA are associated with a higher rate of osteolysis and component loosening.
• Uncemented acetabular components demonstrate a lower incidence of osteolysis, although the pattern may lead to more significant bone loss without associated loosening.