Scientific articleProximal Interphalangeal Joint Volar Plate Configuration in the Crimp Grip Position
Section snippets
MRI evaluation of human subjects
MRI in the crimp grip position was performed on 24 fingers (index = 8, middle finger = 8, ring finger = 8; right hand = 5, left hand = 3) of 8 healthy volunteers (men:women = 6:2, mean age 25 y, SD 3.4 y). Informed consent from each volunteer and institutional review board approval for this study were obtained. Clinical examination of the volunteers' hands confirmed normal morphology and motion. Each finger was examined with the MCP, PIP, and DIP joints in a neutral position and in the crimp
Magnetic resonance imaging evaluation of human subjects
Compared to its location in the neutral and unloaded digit, the VP body was translated from the base of the middle phalanx in a distal direction in the crimp grip position in 24 of 24 volunteers. The average distance of translation was 3.2 mm (SD, 0.07). The average lowest force that was necessary to initiate the crimp grip in the volunteers was 9.7 N (SD, 0.3). No image impairment resulted from motion artifacts in the volunteers.
Magnetic resonance imaging and histological analysis on cadaveric fingers
The Thiel14 embalming technique of the fingers had no major
Discussion
Our study showed a specific configuration with translation of the VP body of 3.2 mm in a distal direction relative to the middle phalanx base in the crimp grip position. The described VP configuration in the crimp grip appears to be physiological, as it was observed in all 24 volunteers and all 12 cadaveric long fingers. The histological analysis showed a substantial reorientation, with a shift in direction of the distal VP attachment fibers in fingers in which translation of the VP body
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