Callus formation after total hip arthroplasty using a short tapered-wedge stem

Area of Science:

• Orthopedic surgery
• Biomechanical engineering

Background:

• Periprosthetic fractures are a significant complication following total hip arthroplasty (THA).
• Callus formation around the prosthesis may indicate stress fractures, but has been understudied.
• Short tapered-wedge stems are associated with a high incidence of periprosthetic fractures.

Purpose of the Study:

• To determine the prevalence of postoperative callus after THA using a short tapered-wedge stem.
• To identify risk factors associated with the development of postoperative callus.

Main Methods:

• Retrospective analysis of 127 patients undergoing THA with a cementless short tapered-wedge stem.
• Measurement of stem insertion depth and radiographic assessment for callus formation at multiple postoperative intervals.
• Logistic regression analysis to identify risk factors for postoperative callus (PC).

Main Results:

• Postoperative callus was observed in 47.2% of patients (60 out of 127).
• Deeper stem insertion depth at 1 month post-THA was a significant independent risk factor for developing postoperative callus (OR 1.14, p=0.002).

Conclusions:

• Deep insertion of short tapered-wedge stems is a significant risk factor for postoperative callus formation.
• This finding has implications for surgical technique to minimize stress around the prosthesis and reduce fracture risk.