A Simple, Anatomically Based Correction to the Conventional Ankle Joint Center [article]

Details

• Personal Author:
  Bruening DA ; Buczek FL ; Crewe AN
• Description:
  Background: Conventional motion analysis studies define the ankle joint center as the midpoint between the most medial and lateral aspects of the malleoli, yet research points toward a more distal joint center location. The purpose of this study was to develop and evaluate an anatomically based correction that would move the conventional ankle joint center to a more accurate location. Methods: Lower extremity radiographs from 30 pediatric patients were analyzed retrospectively. An offset between the conventional and more accurate ankle joint centers was measured and correlated to other common anatomical measures based on conventional skin mounted marker positions. The best correlated measure was used to define a simple correction factor, which was subsequently evaluated by its effect on six degree-of-freedom ankle joint translations during normal gait (n = 8).: Findings: Shank length was found to have the highest bivariate linear correlation (r = 0.89) with the offset. Adjusting the ankle joint center using a percentage of shank length (2.7%) was also as accurate as the regression equation in predicting offset (mean error 0.6 mm, or 6% offset). Adjusting the ankle joint center using this simple percentage resulted in a 25% reduction in mean ankle joint translations during normal gait. Interpretation: The accuracy of the ankle joint center can be increased through a simple, anatomically based correction. This correction may prove beneficial in some kinematic and kinetic applications requiring increased anatomical fidelity. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Musculoskeletal System Occupational Health Safety
• Keywords:
  Ankle Axes Author Keywords: Ankle Joint Center Biomechanical-modeling Biomechanics Gait Analysis Humans Joint Translation Mathematical-models Models Musculoskeletal-system Six-degree-of-freedom Modeling Skeletal-movement Skeletal-system

  More +
• ISSN:
  0268-0033
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Michigan ; OSHA Region 3 ; OSHA Region 5 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  23
• Issue:
  10
• NIOSHTIC Number:
  nn:20034859
• Citation:
  Clin Biomech 2008 Dec; 23(10):1299-1302
• Email:
  dbruening@shrinenet.org
• Federal Fiscal Year:
  2009
• Peer Reviewed:
  True
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:10b963a9892cfa5fdef39ee07d791d97e13ba371025569dff33fe9d12e2a55439a6bdffe4c9823feeb018b94218e831c582b8274da3453b258583b3d826f532a
• Download URL:
  https://stacks.cdc.gov/view/cdc/186911/cdc_186911_DS1.pdf
• File Type:
  [PDF - 598.05 KB ]