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Related Concept Videos

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

649
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
649

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[Adjusted mechanical alignment: operative technique-Tips and tricks].

Hagen Hommel1,2, Spiros Tsamassiotis3, Roman Falk4

  • 1Krankenhaus Märkisch Oderland GmbH, Sonnenburger Weg 3, 16269, Wriezen, Deutschland. h.hommel@khmol.de.

Der Orthopade
|June 5, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces an adjusted mechanical alignment (aMA) technique for knee replacement surgery, prioritizing natural ligament tension over releases. The aMA technique aims for better patient anatomy alignment and improved clinical outcomes in varus gonarthrosis.

Keywords:
AlignmentKnee arthroplasty, totalKnee jointLigament balancingSurgical technique

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Knee Arthroplasty

Background:

  • Mechanical alignment (MA) is standard for neutral leg axis in knee replacements.
  • Aligning prostheses closer to patient anatomy may improve outcomes.
  • The adjusted mechanical alignment (aMA) technique modifies MA by considering natural knee ligament tension to minimize releases.

Purpose of the Study:

  • To present the adjusted mechanical alignment (aMA) surgical technique.
  • To achieve balanced ligament tension through femoral osseous correction, avoiding extensive ligament releases.
  • To optimize prosthesis alignment with patient anatomy for potentially better clinical results.

Main Methods:

  • The aMA technique is an extension-gap-first approach for varus gonarthrosis up to 20°.
  • It focuses on femoral osseous correction and controlled ligament balancing using a quantitative tensioner.
  • Femoral rotation is guided by the sulcus line and soft tissue tension, with tibial component rotation set via flexion-extension cycles.

Main Results:

  • The technique allows for femoral alignment deviations up to 2.5° from neutral in the coronal plane.
  • It aims for symmetrical ligament tension and a rectangular flexion gap.
  • Short-term results are positive, but long-term studies are needed.

Conclusions:

  • The aMA technique integrates measured resection with individual ligament tension.
  • Adjusting femoral component alignment to patient anatomy is recommended.
  • Further high-volume, long-term studies are required to validate the technique's efficacy.