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Robotically Assisted Medial Reduction Osteotomy: A Technique Based on the Pythagorean Theorem.

Olivia Bono¹, James V Bono², James V Bono³

¹Department of Orthopaedic Surgery, Harvard Combined Orthopaedic Residency Program, Boston, Massachusetts.

The Journal of Knee Surgery

|July 28, 2025

Summary

This summary is machine-generated.

Robotic-assisted medial subtraction osteotomy offers a precise method for correcting varus deformity in total knee arthroplasty (TKA). This technique accurately predicts limb alignment correction before other surgical steps.

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Area of Science:

Orthopedic Surgery
Robotic Surgery
Biomechanical Engineering

Background:

Varus deformity poses challenges in total knee arthroplasty (TKA) regarding limb alignment and balancing.
Medial reduction osteotomy is a technique to address these challenges.
Accurate correction is crucial for successful TKA outcomes.

Purpose of the Study:

To describe the utilization of a robotic platform for performing medial subtraction osteotomy in TKA.
To demonstrate a safe and accurate method for varus deformity correction prior to standard surgical procedures.
To validate the predictability of deformity correction using the Pythagorean Theorem.

Main Methods:

Computed tomography-based robotic systems were used for medial tibial osteotomy in TKA patients with significant varus deformity.
The tibial component was virtually downsized, and excess medial bone was mapped and removed using robotic guidance.
The Pythagorean Theorem was employed to predict coronal plane correction based on the osteotomized fragment size.

Main Results:

Robotic guidance enabled accurate mapping and removal of medial tibial bone.
The amount of bone resected directly correlated with the created tibial laxity.
The Pythagorean Theorem accurately predicted the degree of coronal plane correction achieved.

Conclusions:

Robotic-assisted medial subtraction osteotomy is a safe, accurate, and predictable method for correcting varus deformity in TKA.
This technique allows for precise correction before other balancing maneuvers and bony resections.
It enhances the ability to achieve optimal limb alignment in complex TKA cases.