Gap balancing vs. measured resection technique in total knee arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering

Background:

• Achieving symmetric and balanced flexion and extension gaps is crucial in total knee arthroplasty (TKA).
• Surgical techniques for gap balancing remain a subject of debate among orthopedic surgeons.

Purpose of the Study:

• To compare the efficacy of measured resection versus gap balancing techniques in achieving optimal gap balance during TKA.
• To evaluate the functional outcomes and stability associated with each surgical approach.

Main Methods:

• Two scientific studies were conducted to compare the techniques.
• The first study employed computer navigation to assess gap symmetry and rectangularity.
• The second study utilized in vivo video fluoroscopy to evaluate femoral condylar lift-off and instability.

Main Results:

• Computer navigation demonstrated that gap balancing techniques more frequently resulted in a balanced and rectangular flexion gap.
• Video fluoroscopy revealed a significantly higher incidence of femoral condylar lift-off (instability) with the measured resection technique.
• Gap balancing techniques showed superior results in achieving desired joint kinematics.

Conclusions:

• Gap balancing techniques are favored for achieving superior gap balance and improved function in total knee arthroplasty.
• The findings suggest that gap balancing leads to more stable and predictable outcomes compared to measured resection.
• Further research may explore long-term patient-reported outcomes for both techniques.