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  4. Effect of changes of femoral offset on abductor and joint reaction forces in total hip arthroplasty
 
research article

Effect of changes of femoral offset on abductor and joint reaction forces in total hip arthroplasty

Rudiger, Hannes A.
•
Guillemin, Maika
•
Latypova, Adeliya  
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2017
Archives of Orthopaedic and Trauma Surgery

Anatomical reconstruction in total hip arthroplasty (THA) allows for physiological muscle function, good functional outcome and implant longevity. Quantitative data on the effect of a loss or gain of femoral offset (FO) are scarce. The aim of this study was to quantitatively describe the effect of FO changes on abductor moment arms, muscle and joint reactions forces. THA was virtually performed on 3D models built from preoperative CT scans of 15 patients undergoing THA. Virtual THA was performed with a perfectly anatomical reconstruction, a loss of 20% of FO (-FO), and a gain of 20% of FO (+FO). These models were combined with a generic musculoskeletal model (OpenSim) to predict moment arms, muscle and joint reaction forces during normal gait cycles. In average, with -FO reconstructions, muscle moment arms decreased, while muscle and hip forces increased significantly (p < 0.001). We observed the opposite with +FO reconstructions. Gluteus medius was more affected than gluteus minimus. -FO had more effect than +FO. A change of 20% of FO induced an average change 8% of abductor moment arms, 16% of their forces, and 6% of the joint reaction force. To our knowledge, this is the first report providing quantitative data on the effect of FO changes on muscle and joint forces during normal gait. A decrease of FO necessitates an increase of abductor muscle force to maintain normal gait, which in turn increases the joint reaction force. This effect underscores the importance of an accurate reconstruction of the femoral offset.

  • Details
  • Metrics
Type
research article
DOI
10.1007/s00402-017-2788-6
Web of Science ID

WOS:000413220300013

Author(s)
Rudiger, Hannes A.
Guillemin, Maika
Latypova, Adeliya  
Terrier, Alexandre  
Date Issued

2017

Publisher

Springer Verlag

Published in
Archives of Orthopaedic and Trauma Surgery
Volume

137

Issue

11

Start page

1579

End page

1585

Subjects

Hip

•

Arthroplasty

•

Femoral offset

•

Patient-specific musculoskeletal modeling

•

Muscle

•

Moment arm

•

Joint force

Editorial or Peer reviewed

REVIEWED

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Available on Infoscience
November 8, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/141928
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