Petrella et al reported a classification for the psychoflexed hand (fixed finger contractions associated with psychiatric pathology). The authors are from Universite Catholique in Rome.
Finger Flexion
Type
fingers 4 and 5, possibly 3; involving MCP and proximal PIP
1
fingers 4 and 5, possibly 3; involving proximal and distal PIP
2
fingers 2, 3, 4, and 5
3
all 5 fingers (clenched fist syndrome
4
thumb only (isolated flexus adductus thumb)
5
one or more fingers of hand AND one or more non-finger joints in the upper extremity
6
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