Effect of Knee Rotations on Articular Cartilage Compression During Knee Flexion Exercise

Details

• Personal Author:
  Bottorff E ; Chambers A ; Wiltman S
• Description:
  INTRODUCTION: Many occupations involve long-term standing in order to perform various tasks. Surgeons, retail clerks, hairdressers, and manufacturing processors, to name a few, required a large range of motion to operate tools and machinery safely and efficiently. Prolonged standing, however, results in discomfort in the lower extremities. One potential estimate of discomfort is cartilage deformation, which can be estimated as the distance between the tibia and the femur, or the gap distance (Figure 1). Dynamic stereo x-ray reconstructions have been used in prior studies to estimate gap distance. Under the assumption that a decreased gap distance is due to cartilage compression, evidence has shown that gap distance follows an exponential decay in vivo when exposed to 50% bodyweight at full extension for 20 minutes. However, these findings do not accurately account for the short-term changes that arise due to joint rotations through weight shifting during standing. Thus, more accurate methods for evaluating the cartilage compression during standing are necessary. The aim of this study is to determine the effect knee angles and rotations have on cartilage compression in the knee during an in vivo knee flexion exercise. Through characterizing how knee rotations about the ML and AP axes affect calculated gap distance, we may be able to differentiate cartilage compression due to force as a result of standing, and due to knee rotations during long-term standing. OBJECTIVE: The primary objective of this study was to accurately measure changes in knee metrics: specifically, flexion/extension, ab/adduction, and average gap distance of the tibia with respect to the femur. The secondary objective is to identify any trends among the knee metrics. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Mining Occupational Health Safety Staff Development
• Keywords:
  Biomechanics Kinesiology Lower Extremities Motion Studies Muscle Function Muscle Physiology Physiological Testing
• Publisher:
  American Society of Biomechanics (ASB)
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-2
• NIOSHTIC Number:
  nn:20061448
• Citation:
  ASB2017: Proceedings of the American Society of Biomechanics Annual Meeting, August 8-11, 2017, Boulder, Colorado. Newark, DE: American Society of Biomechanics, 2017 Aug; :1-2
• Federal Fiscal Year:
  2017
• Performing Organization:
  University of Pittsburgh at Pittsburgh
• Peer Reviewed:
  False
• Start Date:
  20150901
• Source Full Name:
  ASB2017: Proceedings of the American Society of Biomechanics Annual Meeting, August 8-11, 2017, Boulder, Colorado
• End Date:
  20180831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:31d649020bb274fa97d1bf7cc74859dcb9a2bd85b624dc13727aab496cf4fa17a0c329c87f2f0278a704d59b07196769a91a159d67fca8f5a0c613441e80107f
• Download URL:
  https://stacks.cdc.gov/view/cdc/224978/cdc_224978_DS1.pdf
• File Type:
  [PDF - 399.69 KB ]