Biomechanical Modeling of Deep Squatting: Effects of the Interface Contact Between Posterior Thigh and Shank

Details

• Personal Author:
  Breloff SP ; Carey RE ; Sinsel EW ; Warren CM ; Wu, John Z. ; Zheng L
• Description:
  Epidemiological studies indicate that occupational activities that require extended deep knee flexion or kneeling are associated with a higher prevalence of knee osteoarthritis. In many sport activities, such as a catcher in a baseball or a softball game, athletes have to make repetitive deep squatting motions, which have been associated with the development of osteochondritis dissecans. Excessive deep knee flexion postures may cause excessive loading in the knee joint. In deep knee flexion postures, the posterior aspect of the shank will contact the posterior thigh, resulting in a compressive force within the soft tissues. The current study was aimed at analyzing the effects of the posterior thigh/shank contact on the joint loading during deep knee flexion in a natural knee. An existing, whole body model with detailed anatomical components of the knee (AnyBody) has been adopted and modified for this study. The effects of the posterior thigh/shank contact were evaluated by comparing the results of the inverse dynamic analysis for two scenarios: with and without the posterior thigh/shank contact force. Our results showed that, in a deep squatting posture (knee flexion 120+ degrees), the posterior thigh/shank contact helps reduce the patellofemoral (PF) and tibiofemoral (TF) normal contact forces by 42% and 57%, respectively. [Description provided by NIOSH]
• Subjects:
  Anatomy Cumulative Trauma Disorders Epidemiology Men Musculoskeletal System Occupational Health Safety Women
• Keywords:
  Activity Levels Author Keywords: Soft Tissue Body Mechanics Body Regions Force Humans Inverse Dynamics Knee Disorders Knee Injuries Knee Joint Motion Studies Muscle Muscle Stress Muscle Tissue Physical Stress Physiological Function Repetitive Stress Squatting

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• ISSN:
  0021-9290
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; 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:
  96
• NIOSHTIC Number:
  nn:20057342
• Citation:
  J Biomech 2019 Nov; 96:109333
• Contact Point Address:
  John Z. Wu, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505, USA
• Email:
  jwu@cdc.gov
• Federal Fiscal Year:
  2020
• NORA Priority Area:
  Construction
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Biomechanics
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9bf27c58294dd822fbc075b99c6786353718dbda124f35b020a319002efbe596cb24b1ca3a61f9464cc3cc5c628dceea31df559200df460b028ba0138bc674b0
• Download URL:
  https://stacks.cdc.gov/view/cdc/214727/cdc_214727_DS1.pdf
• File Type:
  [PDF - 282.35 KB ]