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Related Experiment Video

Updated: Jun 10, 2026

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
08:08

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis

Published on: May 8, 2014

Biomechanical differences between two exoprosthetic hip joint systems during level walking.

Eva Ludwigs1, Malte Bellmann, Thomas Schmalz

  • 1Research Department, Otto Bock HealthCare GmbH, Göttingen, Germany. ludwigs.eva@ottobock.de

Prosthetics and Orthotics International
|August 5, 2010
PubMed
Summary

A new prosthetic hip joint, the Helix(3D), shows promise in improving gait for hip disarticulation amputees. This advanced prosthetic hip joint reduces gait abnormalities compared to older designs, potentially increasing user acceptance.

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Last Updated: Jun 10, 2026

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
08:08

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Published on: May 8, 2014

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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

Area of Science:

  • Orthopedic biomechanics
  • Prosthetics and orthotics
  • Gait analysis

Background:

  • Hip disarticulation prostheses often face low user acceptance due to limitations like poor gait, discomfort, and reduced mobility.
  • Existing prosthetic hip joints have inherent design constraints that contribute to gait abnormalities.

Purpose of the Study:

  • To evaluate the effectiveness of a new prosthetic hip joint, the Helix(3D), in improving gait patterns for individuals with hip disarticulation.
  • To compare the gait kinematics and kinetics of the Helix(3D) hip joint against a traditional 7E7 prosthetic hip joint.

Main Methods:

  • Gait analysis of six hip disarticulation amputees using two prosthetic hip joints (Helix(3D) and 7E7).
  • Data collection involved an optoelectronic camera system and force plates to record kinematics and kinetics.
  • Comparison focused on parameters like hip extension during weight acceptance, pelvic tilt, and knee joint flexion during stance and swing phases.

Main Results:

  • The Helix(3D) demonstrated slower hip extension during weight acceptance and later full extension compared to the 7E7.
  • Pelvic tilt range was significantly reduced by approximately 5 degrees with the Helix(3D) joint.
  • Increased stance and swing phase knee flexion angles were observed with the Helix(3D) compared to the 7E7.

Conclusions:

  • The Helix(3D) Hip Joint effectively reduces gait abnormalities in hip disarticulation amputees compared to the 7E7 uniplanar design.
  • The improved gait pattern observed with the Helix(3D) may address some limitations contributing to low user acceptance of hip disarticulation prostheses.