Trapezium Anatomy and Osteology with Side Determination

Mansoor Ahmed

This video reviews the anatomy and osteology of the trapezium, a left bone, and a right hand specimen are used.

Clinical Anatomy Course Director - Dr. Manion, PhD
Anatomy Lab Diener - Adam Jansen

1. Trapeziometacarpal joint- capable of opposition, articular surfaces are twisted, concavo-convex, and interlocking

2. Joint Stability - beak of the first metacarpal, trapezium recess, and ligaments

3. Ligaments - dorsal ligament complex, the volar beak ligament, and the intermetacarpal ligament

4. Palmar surface - tubercle, or ridge and a deep groove, flexor retinaculum (transverse carpal ligament), tendon of the flexor carpi radialis, superficial head of the flexor pollicis brevis, abductor pollicis brevis, opponens pollicis

5. Dorsal surface - groove for the radial artery

6. Lateral surface - radial collateral ligament

7. Proximal surface - scaphoid facet

8. Medial Surface - trapezoid facet

9. Distomedial Surface - facet for 2nd metacarpal

10. Blood Supply - radial artery, and branches of the dorsal and palmar carpal arch, extra osseous and intra-osseous blood supply