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Related Concept Videos

Knee Joint01:23

Knee Joint

2.5K
The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
2.5K

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Related Experiment Video

Updated: Oct 11, 2025

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

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Accelerometer-based, hand-held navigation for improved knee alignment in total knee arthroplasty: An observational

Arun M Swamy1, Archit Goyal1, Vijay Kumar Digge1

  • 1Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India.

Journal of Clinical Orthopaedics and Trauma
|November 29, 2021
PubMed
Summary

Accelerometer-based navigation improves total knee arthroplasty alignment, significantly reducing outliers in coronal and sagittal planes. This technology enhances component positioning but does not influence rotational alignment.

Keywords:
Accelerometer based navigationKneeAlign2Total knee arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Surgical Navigation

Background:

  • Malalignment in total knee arthroplasty (TKA) is linked to reduced implant survival and poorer patient outcomes.
  • Accurate restoration of the native mechanical axis is crucial for successful TKA.
  • Investigating novel navigation technologies is essential for improving TKA accuracy.

Purpose of the Study:

  • To evaluate the accuracy of an accelerometer-based navigation system in restoring the mechanical axis during TKA.
  • To assess the system's effectiveness in achieving optimal coronal and sagittal alignment of femoral and tibial components.

Main Methods:

  • Observational study of 106 primary TKAs using accelerometer-based navigation.
  • Preoperative and postoperative radiological assessments of mechanical axis and component alignment by blinded observers.
  • Analysis of tourniquet time and inter-observer variability.

Main Results:

  • 91.5% of knees achieved alignment within ±3° of the neutral mechanical axis.
  • High accuracy in coronal alignment for femoral (93.39%) and tibial (89.62%) components.
  • Good sagittal plane alignment for femoral (89.62%) and tibial (87.73%) components.

Conclusions:

  • Accelerometer-based navigation effectively minimizes coronal and sagittal alignment outliers in TKA.
  • The system demonstrates significant potential for improving TKA component positioning accuracy.
  • This technology does not appear to influence the rotational alignment of components.