Schenck developed a classification system for fractures and dislocations involving the proximal interphalangeal joint. The author is from Rush-Presbyterian-St. Luke's Medical Center in Chicago.
Parameters:
(1) grade of articular fracture involving the base of the middle phalanx
(2) grade of dislocation and/or subluxation
(3) fracture of the proximal phalangeal head
percent of articular surface for the middle phalangeal base involved by fracture
Grade
<= 10%
I
11 – 20%
II
21 – 40%
III
> 40%
IV
degree of dislocation/subluxation between the head of the proximal phalanx and the base of the middle phalanx
Grade
< 25%
A
25 – 50%
B
> 50% but subtotal
C
total
D
Fractures of the proximal phalangeal head may be:
(1) unicondylar or
(2) bicondylar
The fragments of the condylar fracture may be:
(1) nondisplaced (stay in place) or
(2) displaced (separated)
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