Trapezium (left) (Os trapezium)
Educational content only — not medical advice.
Anatomy
A distal-row carpal facing the first metacarpal with a saddle surface creating the first carpometacarpal joint — the joint of opposition that gives the thumb its uniquely human grip. This is the left member of the pair.
Clinical notes
Osteoarthritis of this saddle joint (rhizarthrosis) turns the thumb base painful with every pinch and grip; treatment spans splints to joint replacement.
Related structures
Educational references
FAQ
What is the role of the Trapezium (left)?
A distal-row carpal facing the first metacarpal with a saddle surface creating the first carpometacarpal joint — the joint of opposition that gives the thumb its uniquely human grip. This is the left member of the pair.
Why is the Trapezium (left) clinically important?
Osteoarthritis of this saddle joint (rhizarthrosis) turns the thumb base painful with every pinch and grip; treatment spans splints to joint replacement.
Source & license
Derived from Z-Anatomy (Gauthier Kervyn et al.), CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/); upstream geometry from BodyParts3D, © The Database Center for Life Science. license details