(a) Oblique radiograph of the left thumb demonstrating dorsal subluxation of the first metacarpal bone at the basal joint ... carpal ligaments (dorsal and volar intercalated segment instability ...

had been placed over the volar aspect of the left ... There was a dislocation of the greater multiangular 1st metacarpal joint and a fracture of the proximal thumb phalanx, with consequent ...