Abstract: A hand splint which leaves the volar wrist free and which can be used alone or as a foundation splint for the attachment of various permanent and removable hand and finger corrective devices. The splint includes a manually bendable support medium having a substantially C-shape including a palmar piece which fits into the palmar arch of the hand, a proximal dorsal forearm piece adapted to contact the dorsal wrist and at least a portion of the dorsal forearm, and a dorsal hand piece extending between the palmar piece and the proximal dorsal forearm piece. Adjustable tension means is provided on the dorsal side of the wrist. Detachable thumb, finger and metacarpophalangeal support as well as an interphalangeal assist are provided separately and in combination. A novel hinge and adjustable strap attachment means are also provided.