Caution required when using an intraoperative knee balancer in total knee arthroplasty

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Surgical instrumentation

Background:

• Total knee arthroplasty (TKA) requires precise balancing of flexion and extension spaces for optimal outcomes.
• Existing surgical devices aim to assist surgeons by measuring these spaces under specific forces.
• The accuracy and reliability of these balancing devices are critical for surgical success.

Purpose of the Study:

• To analyze the accuracy of a specific type of knee balancer device used in total knee arthroplasty.
• To evaluate the device's performance in measuring distances and forces within the knee joint during simulated surgical conditions.

Main Methods:

• The study involved the analysis of a specific knee balancer device.
• Measurements of distance and force were recorded during simulated total knee arthroplasty procedures.
• The reproducibility of force measurements was specifically assessed.

Main Results:

• The analyzed knee balancer demonstrated high accuracy in measuring the distances between joint spaces.
• However, the device exhibited significant inaccuracies in providing reproducible force measurements.
• Inconsistent force readings may pose challenges for surgeons relying on this device.

Conclusions:

• The evaluated knee balancer is accurate for assessing joint space distances in total knee arthroplasty.
• The device's limitations in reproducible force measurement require consideration.
• Further development may be needed to improve the force-measuring capabilities of such surgical instruments.