Ulnar claw hand is deformity in lumbricals due to damage of
ulnar nerve.
Medial two lumbricals are innervated by ulnar nerve.
Patient with median claw hand , shows symptoms with
hyperextension of metacarpophalangeal joint and there will be
increased flexion between proximal and distal interphalangeal joint
on medial 2 fingers.
Hence , when patient with median claw hand makes a fist , 4th
and 5 th digit remain open where as 1st , 2nd and 3 rd digit become
closed.Because those digits are innervated by median nerve.