Navigated versus conventionally instrumented total knee arthroplasty techniques: No difference in functional...

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Medical Technology Assessment

Background:

• Debate continues regarding the superiority of navigated versus conventional instrumentation in total knee arthroplasty (TKA).
• Registry data suggest no long-term survivorship benefit for navigated TKA, despite higher costs.
• Outcome comparisons are often confounded by variations in surgeon technique and alignment goals.

Purpose of the Study:

• To investigate alignment and balance outcome differences between navigated and conventionally instrumented TKAs.
• To compare outcomes using an identical operative sequence and alignment strategy.
• To control for surgeon technique and alignment preferences in comparing TKA instrumentation.

Main Methods:

• A comparative study of 50 navigated and 50 conventionally instrumented primary TKAs.
• Utilized an identical inverse kinematic alignment strategy for both groups.
• Navigation equipment recorded conventionally instrumented TKAs intraoperatively for direct comparison of balance, range, and alignment.

Main Results:

• No significant differences were found in intraoperative balance, range of motion, or alignment between the two techniques.
• Radiographic accuracy for restoring constitutional alignment was similar for both navigated and conventional TKA.
• No preoperative demographic or deformity severity differences existed between the groups.

Conclusions:

• This surgeon and technique-controlled study found no alignment or balance advantages for navigated TKA over conventional methods.
• Increased resources for technology assistance are not justified by these findings.
• Further research with larger sample sizes or alternative outcome measures may be warranted.