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Related Concept Videos

Knee Joint01:23

Knee Joint

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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.
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Kinematic Equations for Rotation01:30

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
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Rotational Motion about a Fixed Axis01:26

Rotational Motion about a Fixed Axis

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
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Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy
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Component Rotation in Well-Functioning, Gap Balanced Total Knee Arthroplasty Without Navigation.

Jacob M Elkins1, Jason M Jennings2, Roseann M Johnson3

  • 1University of Iowa, Iowa City, Iowa.

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|March 24, 2023
PubMed
Summary
This summary is machine-generated.

This study found that most total knee arthroplasty (TKA) components aligned well using the gap balancing (GB) technique, even without navigation. Native bone shape did not significantly influence TKA component positioning.

Keywords:
gap balancingknee alignmentknee anatomyknee mechanicstotal knee arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical imaging

Background:

  • Component malalignment in total knee arthroplasty (TKA) can lead to clinical failure.
  • The gap balancing (GB) technique prioritizes soft-tissue balance over precise component alignment.
  • Variations in component placement may occur with the GB technique.

Purpose of the Study:

  • To assess the precision of component alignment in well-functioning GB TKAs performed without navigation.
  • To investigate the relationship between native femoral version, tibial torsion, and TKA component positioning.

Main Methods:

  • Computed tomography (CT) was used to evaluate 93 TKAs with a minimum 2-year follow-up.
  • Component rotational alignment, femoral version, and tibial torsion were assessed.
  • Standardized methods were employed for rotational alignment assessment.

Main Results:

  • Most evaluated components were within the desired rotational range.
  • No significant correlation was found between native femoral version and femoral component rotational alignment (r=0.007).
  • A weak correlation was observed between native tibial torsion and tibial component alignment (r=0.24).

Conclusions:

  • The gap balancing technique, even as a secondary objective, generally achieves acceptable component rotation in TKA.
  • Native osseous rotational geometry does not appear to significantly influence TKA component alignment.