Porous-coated anatomic total hip prostheses: radiographic analysis and clinical correlation

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering
• Radiology

Background:

• Bone-ingrowth, porous-coated hip prostheses are widely used in total hip replacement.
• Assessing radiographic changes is crucial for understanding implant longevity and patient outcomes.
• Previous studies have explored various radiographic indicators of implant success.

Purpose of the Study:

• To correlate radiographic findings with clinical outcomes in patients with porous-coated anatomic total hip prostheses.
• To identify specific radiographic features that predict failure or success of femoral stem components.
• To evaluate the predictive power of subsidence and other radiographic markers on clinical results.

Main Methods:

• Review of radiographic changes in 46 bone-ingrowth, porous-coated anatomic total hip prostheses.
• Assessment of features including subsidence, periprosthetic lucencies, new bone formation, loose beads, and implant fit.
• Correlation of radiographic findings with clinical outcomes using the Harris hip score.
• Average postoperative follow-up of 32 months.

Main Results:

• All acetabular components demonstrated favorable outcomes.
• Three femoral stem components required revision surgery.
• Radiographic subsidence greater than 10 mm was the strongest predictor of poor clinical outcome, particularly when progressive.
• Loosely placed femoral stems and loose beads were also associated with failure, but with weaker predictive power.

Conclusions:

• Femoral stem subsidence is a critical radiographic indicator of clinical outcome in porous-coated total hip prostheses.
• Close monitoring of subsidence in postoperative follow-up is essential for early detection of potential implant failure.
• While other radiographic findings exist, subsidence alone provides a powerful assessment of implant performance.