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Changes in Scaphoid and Lunate Position and Loading at Two Wrist Pushup Positions
Frederick W Werner1, Emily R Tucci1, Brett T Daly1
1Department of Orthopedic Surgery, SUNY Upstate Medical University, Syracuse, New York, United States.
Current Rheumatology Reviews
|December 12, 2018
Summary
Neutral pushups may increase stress on injured scapholunate interosseous ligaments (SLIL) compared to extended pushups. Extended pushups may be a safer rehabilitation option for athletes recovering from SLIL injuries.
Area of Science:
- Orthopedic biomechanics
- Sports medicine
- Hand surgery
Background:
- Scapholunate interosseous ligament (SLIL) injuries can cause carpal instability and require extensive rehabilitation.
- Pushups are common in athletic rehabilitation, but the safest position for SLIL injuries is unknown.
Purpose of the Study:
- To compare the biomechanical effects of neutral versus extended pushup positions on cadaver wrists with simulated SLIL damage.
Main Methods:
- Six cadaver wrists with induced SLIL damage were subjected to uniaxial loading simulating neutral and extended pushups.
- Kinematic data measured scaphoid and lunate motion relative to the radius.
- Gap distances at SLIL insertion sites were calculated.
Main Results:
- Significantly greater gap distances were observed at the proximal SLIL insertion in the neutral position compared to the extended position.
- A trend of increased gap distances at dorsal and volar SLIL insertions in the neutral position was noted.
- Wrist extension of 90° resulted in substantial scaphoid and lunate extension relative to neutral.
Conclusions:
- Neutral pushups may impose greater stress on wrists with SLIL damage, potentially impeding recovery.
- Extended pushups appear to be a less detrimental option for rehabilitation in wrists with SLIL injuries.
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