Carpometacarpal Joints

Question 1

Metacarpal 1

Answer 1

trapezium—MC 1

saddle joint

Question 2

Metacarpal 2

Answer 2

trapezoid- MC 2

complex saddle

Question 3

Metacarpal 3

Answer 3

capitate—MC3

complex saddle

Question 4

Metacarpal 4/5

Answer 4

convex hamate- concave MC 4/5

plane joint

Question 5

Thumb CMC joint

Answer 5

saddle joint

trapezium concave longitudinally, convex transversely

Question 6

Movements of 1st CMC joint

Answer 6

F/E- frontal plane
Ab./ADD.- saggital plane

can rotate but not 3 DOF

Question 7

What is opposition?

Answer 7

abduction and flexion + medially rotation

Question 8

5 ligaments of CMC

Answer 8

1. Anterior oblique
2. Ulnar collateral
3. 1st intermetacarpal
4. posterior oblique
5. radial collateral

Question 9

Anterior oblique

Answer 9

PA: anterior trapezium

taut: AB, ext, oppo

Question 10

ulnar collateral

Answer 10

PA: transverse carpal ligament

taut: AB, ext, oppo

stabilizes MCP, prevents valgus force

Question 11

1st intermetacarpal

Answer 11

PA: 2nd MC

taut: AB, oppo

Question 12

Posterior oblique

Answer 12

PA: post. trapezium

taut: AB, oppo

Question 13

radial collateral

Answer 13

PA: radial side of trapezium

taut: all mvmts except Ext.

stabilizes MCP