Comparison of limb-length discrepancy after THA: with and without computer navigation

Area of Science:

• Orthopedic Surgery
• Medical Technology
• Biomechanical Engineering

Background:

• Limb-length discrepancy is a common complication after total hip arthroplasty (THA).
• Discrepancies can lead to patient dissatisfaction and hip instability.
• Accurate restoration of limb length is crucial for successful THA outcomes.

Purpose of the Study:

• To evaluate the efficacy of computer-navigated surgical techniques in restoring limb-length equality after THA.
• To compare limb-length discrepancy between navigated and free-hand THA.
• To assess the impact of limb-length restoration on patient-reported outcomes.

Main Methods:

• Retrospective study of 150 patients undergoing THA.
• Comparison of 75 patients with computer-navigated THA versus 75 patients with free-hand THA.
• Limb-length discrepancy measured via digital anteroposterior pelvic radiographs; Harris Hip Score and subjective limb length perception assessed.

Main Results:

• Computer-navigated THA achieved significantly better limb-length equality (0.3 mm difference) compared to free-hand THA (1.8 mm difference).
• No statistically significant difference was observed in Harris Hip Scores between the two groups.
• Patient perception of limb length did not differ between navigated and non-navigated THA groups.

Conclusions:

• Computer-navigated THA improves the accuracy of limb-length restoration following total hip arthroplasty.
• While navigation enhances objective limb length accuracy, it does not appear to improve subjective patient outcomes or functional scores.
• Further research may explore factors influencing patient perception of limb length post-THA.