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Palmar lip # lead to Dorsal sublaxation - volar plate impaction
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stability of reduction & percent of #
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stable & less than 30% #
- stable in extension
- Stable in Hyper-extension Swan neck deformity
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tenuous=weak & Thin & 30-50%#
- stable if PIP is flexed at less than 30 degree
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Unstable & more than 50%
- stable if PIP is flexed MORE than 30 degree
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Dorsal lip # lead to palmar sublaxation - Central slip impaction - stability is Always assessed in extension
- STABLE in PIP extension
- UNstable = volar displaced (aka palmar translation) of middle phalanx
- pilon= volar & dorsal lip fracture - volar plate and central slip impaction