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stsg ftg skin grafting pinch grafting micrografting meek graft radial longitudinal deficiency radial dysplasia radial ray deficiency radial longitudinal dysplasia radial club hand hand surgery distant flaps for hand regional flaps of hand local flaps of hand hand flap coverage hand defects upperlimb flap forearm flaps pia flap posterior interosseous artery flap flexor tendon rehabilitation flexor tendon injury of hand flexor tendon repair of hand