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Related Experiment Video

Updated: Jul 9, 2026

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
08:52

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness

Published on: March 18, 2022

Interobserver Variability of Intraoperative Soft Tissue Laxity Assessment in Robotic-Assisted Total Knee Arthroplasty

Hiroki Kishi1, Daisuke Nishiyama2, Daisuke Fukui2

  • 1Wakayama Medical University, Department of Orthopaedic Surgery, Wakayama, Japan, Wakayama.

The Journal of Knee Surgery
|July 7, 2026
PubMed
Summary
This summary is machine-generated.

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Assessing soft tissue laxity during robotic total knee arthroplasty (TKA) shows variability. Angular measurements are more reliable than gap measurements, highlighting the need for standardized methods in robotic-assisted TKA for consistent joint balance.

Area of Science:

  • Orthopedic surgery
  • Robotics in medicine
  • Biomechanical analysis

Background:

  • Robotic systems enhance bone alignment precision in total knee arthroplasty (TKA).
  • Accurate intraoperative soft tissue evaluation is crucial for optimal joint balance in TKA.
  • Reproducibility of soft tissue assessments during robotic TKA is not well-established.

Purpose of the Study:

  • To evaluate the interobserver reliability of intraoperative soft tissue laxity assessment.
  • To compare the reliability of angular versus gap-based measurements.
  • To assess laxity during robotic-arm assisted TKA using the ROSA system.

Main Methods:

  • Retrospective analysis of 37 knees from ROSA-assisted TKA.
  • Manual assessment of soft tissue laxity under varus/valgus stress at extension and 90° flexion.

Related Experiment Videos

Last Updated: Jul 9, 2026

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
08:52

Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness

Published on: March 18, 2022

  • Recorded joint gap widening and hip-knee angle (HKA); evaluated agreement using ICC and Bland-Altman plots.

    • Main Results:

    • Excellent interobserver reliability for angular measurements (HKA at extension, ICC = 0.94).
    • Poorer reliability for gap-based measurements (lateral laxity, ICC = 0.31).
    • Stronger agreement at extension than 90° flexion; contralateral assessments showed better consistency.

    Conclusions:

    • Intraoperative soft tissue laxity evaluation in robotic TKA is subject to interobserver variability.
    • Angular measurements demonstrate higher reliability than gap-based measurements.
    • Standardized methods are needed to improve consistency in soft tissue evaluation during robotic TKA.