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To evaluate dexterity and grip strength after simulated distal interphalangeal (DIP) joint fusion of the index and middle fingers in varying degrees of flexion.

Forty-six right-handed subjects performed grip and dexterity testing using the Grooved Pegboard Test in positions of index finger 20° flexion or full extension, middle finger 20° flexion or full extension, and unrestricted index and middle finger DIP joint motion (control). Simulated fusion was performed with the use of custom-molded thermoplastic orthoses.

Index finger dexterity scores were improved when the DIP joint was splinted in 20° compared with full extension. There was no significant difference in the middle finger dexterity when comparing 20° flexion with full extension. In either position, dexterity scores were higher (lower performance) for the index finger than for the middle finger, showing a greater interference to dexterity with …