Patient-specific computed tomography based instrumentation in total knee arthroplasty: a prospective randomized...

Area of Science:

• Orthopedic Surgery
• Radiology
• Biomedical Engineering

Background:

• Total knee arthroplasty (TKA) aims to restore function and alignment.
• Patient-specific instrumentation (PSI) using computed tomography (CT) is a newer technique designed to improve surgical accuracy.
• Conventional instrumentation is the established method for TKA.

Purpose of the Study:

• To compare radiological outcomes of TKAs performed with CT-based PSI versus conventional instrumentation.
• To test the hypothesis that CT-based PSI increases TKA accuracy.

Main Methods:

• A prospective, randomized controlled trial involving 112 patients (95 analyzed) from January to December 2011.
• Patients were randomized into two groups: experimental (52 patients, CT-based PSI) and control (60 patients, conventional instrumentation).
• Radiographic evaluation of implant positioning and coronal alignment was conducted 12 months post-surgery using full-leg standing AP and lateral radiographs.

Main Results:

• No statistically significant differences were found in coronal/sagittal component positioning or overall coronal alignment between the groups.
• The control group showed a statistically borderline improvement in frontal tibial component positioning.
• Overall, CT-based PSI did not demonstrate superiority over conventional instrumentation in this study.

Conclusions:

• CT-based PSI did not prove superior to conventional instrumentation for TKA radiological results.
• Further high-quality research is essential to evaluate the utility of patient-specific systems in TKA.
• Surgeons using PSI technology require advanced knowledge and significant experience with conventional TKA methods.