The carpal bones on the ulnar side only make intermittent contact with the proximal side -- the triquetrum only makes contact during ulnar abduction.
The capitate, lunate, hamate and triquetrum are bounded together in this procedure and the scaphoid is excised.
The lunate is stabilised by a medial ligament to the scaphoid and a lateral ligament to the triquetrum.
The superior articular surfaces of the scaphoid, lunate, and triquetrum form a smooth convex surface, the condyle, which is received into the concavity.
The pisiform and triquetrum are pushed in a palmar to dorsal direction.
The seven instruments include: a triquetrum, a dioptra, a triangular instrument, a quadrant, devices involving reflection, an astrolabe, and simple tips for viewing things with the naked eye.
