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Changes in radiocarpal loading characteristics after proximal row carpectomy.
Christopher J Hogan1, Patricia L McKay, Gregory G Degnan
1Department of Orthopedic Surgery, Naval Medical Center Portsmouth, Portsmouth, VA 23708, USA.
The Journal of Hand Surgery
|December 4, 2004
Summary
Proximal row carpectomy significantly alters wrist loading, increasing contact pressure and area in the lunate fossa. This modified loading may reduce the risk of radiocapitate arthritis after the procedure.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Hand Surgery
Background:
- Proximal row carpectomy (PRC) is a surgical procedure used for treating wrist arthritis.
- Understanding the biomechanical consequences of PRC is crucial for predicting patient outcomes.
Purpose of the Study:
- To quantify the changes in radiocarpal joint loading after performing a proximal row carpectomy in a cadaveric model.
- To investigate the impact of PRC on pressure distribution and contact mechanics within the wrist.
Main Methods:
- Seven human cadaver wrists were utilized for pressure mapping.
- Radioulnar carpal pressure distributions were measured using pressure-sensitive film before and after PRC.
Main Results:
- Following PRC, contact area in the lunate fossa increased by 37%, and average contact pressure rose by 57%.
- The contact point's radial shift was 5.5 mm, and its volar/dorsal excursion during wrist motion increased by 108%.
Conclusions:
- Proximal row carpectomy leads to significant alterations in radiocarpal loading patterns.
- The observed increase in radiocarpal excursion post-PRC may contribute to the infrequent development of radiocapitate arthritis.