The restraint assembly includes a mounting plate having a vertical slot. The plate covers an opening in a surface which is located to restrain a patient. An adapter buckle has a “T” stop which is releasably coupled to the vertical slot. The buckle includes an arm and a head. The head includes a horizontal slot for releasable receipt of a strap of the patient restraint. The arm includes an angular bend which positions the head relative to the plate during use. A lock may be used to prevent undesired separation of the buckle from the plate.
