16.   A patient presents to your clinic with moderately severe carpal tunnel syndrome. His electromyography (EMG) examination also showed moderately severe ulnar mononeuropathy localized at the cubital tunnel.   However,   he is not experiencing typical signs or symptoms of cubital tunnel syndrome. What would explain this? A.    Riche Canneau Anastomosis B.    Martin Gruber Anastomosis C.    Marinacci Anastomosis D.    Beretinni Anastomosis 17.   What complication is possible following a volar proximal interphalangeal (PIP) dislocation and what early treatment is essential? A. Swan neck deformity; figure 8 splint; active flexion B. Boutonnière deformity; PIP extension splint; oblique retinacular ligament (ORL) stretching C. Mallet finger; distal interphalangeal (DIP) hyperextension splint; range of motion  (ROM) to unaffected joints. D.  Metacarpal phalangeal (MCP) flexion contract...

16. Correct Answer: B. Martin Gruber Anastomosis A Martin Gruber Anastomosis is an anomalous, and primarily motor connection, of the median and ulnar nerves in the forearm.  A lesion to the ulnar nerve proximal to this connection will not result in typical signs and symptoms of ulnar nerve disruption because of median innervation to the ulnar innervated intrinsic muscles of the hand. A Riche Canneau Anastomosis (Answer A.) is a connection between the deep branch of the ulnar nerve and the recurrent branch of the median nerve at the thenar eminence. The Marinacci Anastomosis (Answer C.) occurs in the forearm, with the ulnar nerve connecting to the median nerve. (Just the opposite of the Martin Gruber Anastomosis.) A Beretinni Anastomosis (Answer D.) is an anomalous communication between common digital nerves in the hand that arise from both the ulnar and median nerves Reference: Neuroanatomy 2009; 8:15-19 Greens Operative Hand Surgery ( chap. 30 Compression...