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Table 2 Arthroscopic classification of stability

From: ACTION trial: a prospective study on diagnostic Accuracy of 4D CT for diagnosing Instable ScaphOlunate DissociatioN

Stability Stadium (Geissler/ EWAS) Anatomical Correlation Arthroscopic test
stable I elongation Microhook cannot be advanced into the joint
II rupture of membranous portion of SLL Microhook can be advanced into the joint but joint is not widened
unstable IIIA II + rupture of palmar portion of SLL Joint widens on the palmar side during manipulation with microhook
IIIB II + rupture of dorsal portion of SLL Joint widens on the dorsal side during manipulation with microhook
IIIC II + rupture of palmar and dorsal portion Joint widens on both palmar side during manipulation with microhook but closes after manipulation
IV IIIC + widening of SL joint Joint can be passed by arthroscope
V IV + tilting of carpalia widening of SL joint with pathological plain radiographs