Optimal correction in high tibial osteotomy for varus deformity

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Knee Joint Anatomy

Background:

• Traditional methods for determining high tibial osteotomy correction angles using standing films are unreliable due to muscular influence on knee positioning.
• Assessing medio-lateral knee joint instability is crucial for accurate surgical planning.

Purpose of the Study:

• To evaluate the reliability of the three-point technique for measuring knee instability in high tibial osteotomy.
• To determine optimal varus/valgus correction angles for improved patient-reported outcomes.
• To establish guidelines for surgical correction to enhance knee stability post-operation.

Main Methods:

• Utilized the three-point technique to measure medio-lateral instability and varus/valgus deviation in patients undergoing high tibial osteotomy.
• Correlated measured deviations with patient-reported subjective ratings of surgical outcomes.
• Analyzed data to identify optimal correction ranges and supplementary surgical procedures.

Main Results:

• The three-point technique provides a reliable method for assessing knee joint instability.
• Correction to 3-7 degrees of valgus deviation resulted in the best subjective patient ratings.
• An additional 1-2 degrees of angular correction may be beneficial to account for expected subjective relapse.

Conclusions:

• The three-point technique is a valuable tool for determining precise correction in high tibial osteotomy.
• Targeting 3-7 degrees of valgus correction, with potential additional adjustment, improves patient satisfaction.
• Lateral capsule reconstruction is recommended to prevent increased knee instability.