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.
The pisiform and triquetrum are pushed in a palmar to dorsal direction.
The superior articular surfaces of the scaphoid, lunate, and triquetrum form a smooth convex surface, the condyle, which is received into the concavity.
The lunate is stabilised by a medial ligament to the scaphoid and a lateral ligament to the triquetrum.
The capitate, lunate, hamate and triquetrum are bounded together in this procedure and the scaphoid is excised.
The carpal bones on the ulnar side only make intermittent contact with the proximal side -- the triquetrum only makes contact during ulnar abduction.
