Abstract
At the wrist, kinematic coupling (the relationship between flexion-extension and radial-ulnar deviation) facilitates function. Although the midcarpal joint is critical for kinematic coupling, many surgeries, such as 4-corner fusion (4CF) and scaphoidexcision 4-corner fusion (SE4CF), modify the midcarpal joint. This study examines how 4CF and SE4CF influence kinematic coupling by quantifying wrist axes of rotation. Wrist axes of rotation were quantified in 8 cadaveric specimens using an optimization algorithm, which fit a 2-revolute joint model to experimental data. In each specimen, data measuring the motion of the third metacarpal relative to the radius was collected for 3 conditions (nonimpaired, 4CF, SE4CF). The calculated axes of rotation were compared using spherical statistics. The angle between the axes of rotation was used to assess coupling, as the nonimpaired wrist has skew axes (ie, angle between axes approximately 60°). Following 4CF and SE4CF, the axes are closer to orthogonal than those of the nonimpaired wrist. The mean angle (±95% confidence interval) between the axes was 92.6° ± 25.2° and 99.8° ± 22.0° for 4CF and SE4CF, respectively. The axes of rotation defined in this study can be used to define joint models, which will facilitate more accurate computational and experimental studies of these procedures.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 12-23 |
| Number of pages | 12 |
| Journal | Journal of Applied Biomechanics |
| Volume | 33 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 2017 |
Funding
We thank Stephen Piazza, PhD, for helpful discussions regarding implementation of the optimization routine; Pascal Paschos, PhD, for assistance with Northwestern University's computer cluster; and Vikram Darbhe, MS, for building the experimental set-up. This material is the result of work supported with resources and the use of facilities at the Edward Hines Jr. VA Hospital, Hines, IL. As such, we thank Ajay Balaram, MD, and Hilton Gottschalk, MD, for assistance with specimen preparation, and Andrew Lee, BS, for assisting with experimental testing, all of which were performed at the Musculoskeletal Biomechanics Laboratory at the Hines VA. The contents do not represent the views of the U.S. Department of Veterans Affairs or the United States Government. This work was funded by The Searle Funds of the Chicago Community Trust and the National Institutes of Health (NIH T32 HD007418 and NIH F31 AG041627). We thank Medcure for donation of the cadaveric specimens.
Keywords
- Axes of rotation
- Kinematics
- Motion analysis
- Scaphoid-excision four-corner fusion
- Wrist
ASJC Scopus subject areas
- General Medicine