6a. Transradial Body-Powered Standards

		Standards
1. Professionalism		NA
2. Universal precautions		NA
3. Bench test	Operation and setup of housing and cable	Location of cuff straps on transradial prosthesis with flexible hinges Standard: Should be located 2.5cm proximal to wrist (to allow maximum pronation/supination).
	Control system efficiency >80% F TD/Harness	Control system efficiency (Efficiency = Force at TD/Force at harness) Standard: At least 80% for single control harness Standard: At least 50% for dual control harness
4. Socket Fit
First: CHECK Condition of residual limb!
ANATOMICAL LANDMARKS
TISSUE FIT
TRIMLINES AND ROM	Elbow flexion	Elbow flexion/extension Standard with flexible hinges: within 10` of active elbow ROM Standard with rigid hinges: within 10` of active elbow ROM Standard with self-suspension: ~105-110` elbow flexion
	Elbow extension
	Transverse rotation
	Trimline location	Self-suspension: encompass the epicondyles at the level of the P-M-L with enough of a brim to flare the soft tissue. Standard: 25mm proximal
STABILITY/LOAD TESTS	Elbow extension
	Elbow flexion
	Transverse rotation	Standard: minimal, if any, rotation of the socket with 3 lbs. force.
	Axial Compression
	Axial load <1” (2.5cm)	Standard: the prosthesis should not slip more than 1 inch and harness should not tear with 50lbs (or 1/3 body wt.) for axial load.
OVERALL SOCKET FIT	Distributed pressures
	Socket comfort

		Standards
5. Joint axis location		Joint Axis Location for Rigid Hinges for joint spacer installation Standard: Joint center located at axis of anatomical center Standard: Distance from humeral cuff to olecranon is 25mm
6. Length of the prosthesis		Standard: TD tip matches thumb tip of contralateral side
7. Alignment
8. Operation of the prosthesis	Elbow at 90 degrees	Check that full opening and closing can be obtained in these positions. Standards: With elbow at 90 degrees = 90% opening
	TD at waist	TD at waist = 70% opening
	TD at mouth	TD at mouth = 70% opening
9. Harness critique	Suspension: Comfort (and cuff): Operation:	The ends of all Dacron should be singed to prevent fraying of the fabric. The largest loop on the 4-bar buckle goes toward the ring. Don the prosthesis on the pt and check the harness fit Standards: The harness should lay flat on the patient’s body, no edges cutting in The inverted Y splits within 2.5cm proximal to the pectoralis tendon to 2.5cm distal to clavicle The anterior suspensor is positioned in the delto-pectoral groove The crosspoint is inferior to C-7 and 2.5cm (1”) toward the contralateral side The cable should be either always on or always off the pts back
10. Technical quality
11. Comprehension
12. Function		Standard: a patient is expected to be able to lift 20-30lbs using a transradial prosthesis, unless the residual limb is extremely short of sensitive

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