Computer-assisted knee arthroplasty versus a conventional jig-based technique. A randomised, prospective trial

Area of Science:

• Orthopedic Surgery
• Medical Technology
• Biomechanical Engineering

Background:

• Total knee arthroplasty (TKA) is a common procedure to address knee osteoarthritis.
• Accurate component alignment is crucial for optimal TKA outcomes and longevity.
• Conventional jig-based techniques may have limitations in achieving precise alignment.

Purpose of the Study:

• To compare the accuracy and outcomes of a novel computer-assisted surgery (CAS) technique versus the conventional jig-based technique for TKA.
• To evaluate the impact of CAS on component alignment, limb alignment, and peri-operative morbidity.

Main Methods:

• A randomized controlled trial involving 70 patients undergoing TKA.
• Patients were allocated to either CAS or conventional jig-based TKA.
• Post-operative CT scans and limb alignment views were used for assessment. Peri-operative data including blood loss were collected.

Main Results:

• CAS demonstrated statistically significant improvements in femoral and tibial component alignment (varus/valgus, rotation, slope) and reduced femorotibial mismatch.
• Improved standing limb alignment was observed with CAS.
• CAS resulted in significantly less blood loss compared to the conventional technique.
• CAS procedures were associated with a longer operative time (mean increase of 13 minutes).

Conclusions:

• Computer-assisted surgery offers superior accuracy in component placement during total knee arthroplasty.
• CAS leads to improved limb alignment and reduced blood loss, potentially enhancing patient outcomes.
• The increased operative time with CAS is a trade-off for improved precision in knee replacement surgery.