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Scaphoid excision with four-corner fusion: a biomechanical study
Martin Skie1, Matt Grothaus, Despina Ciocanel
1Department of Orthopedic Surgery, University of Toledo, Health Science Campus, 3065 Arlington Ave, Dowling Hall, Toledo, Ohio, 43614, USA. martin.skie@utoledo.edu
Hand (New York, N.Y.)
|September 10, 2008
Summary
Four-corner fusion with scaphoid excision shifts wrist joint force to the radiolunate area. This biomechanical study investigates load redistribution after this common surgical procedure for wrist arthritis.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Hand and Wrist Surgery
Background:
- Partial wrist arthrodesis, like four-corner fusion, is a common treatment for posttraumatic wrist arthritis.
- This procedure aims to relieve pain while preserving some wrist motion.
Purpose of the Study:
- To evaluate how forces redistribute in the wrist after a four-corner fusion and scaphoid excision.
- To correlate these biomechanical changes with clinical outcomes.
Main Methods:
- Fifteen cadaveric wrists underwent simulated four-corner fusion and scaphoid excision.
- Pressure-sensitive film measured load distribution in the radiocarpal joint before and after the procedure.
- Loads were applied using a material testing system, and forces on the scaphoid fossa, lunate fossa, and triangular fibrocartilage complex (TFCC) were compared.
Main Results:
- A statistically significant difference in mean total force was observed across the scaphoid, lunate, and TFCC before and after fusion (p = 0.0001).
- Mean total force significantly decreased in the scaphoid fossa post-surgery (p = 0.0001).
- A non-significant increase in force was noted in the lunate fossa (p = 0.08), with no change in the TFCC (p = 0.995).
Conclusions:
- Load is preferentially transferred to the radiolunate joint after scaphoid excision and four-corner fusion.
- This redistribution of force is a key biomechanical consequence of the procedure.