1st carpometacarpal joint

Question 1

classification

Answer 1

synovial saddle joint

Question 2

axes of movement

Answer 2

varies

Question 3

articular surfaces

Answer 3

trapezium
base of 1st MC

Question 4

features of trapezium

Answer 4

convex med->lat
concave palmar->dorsal
covered in hyaline cartilage

Question 5

features of 1st MC

Answer 5

convex palmar->dorsal
concave med->lat

Question 6

3 features of the capsule

Answer 6

loose but strong
attaches to articular margins
thickened by radial carpometacarpal ligament laterally
strengthened by posterior oblique ligaments ant/post

Question 7

ligaments

Answer 7

radial carpometacarpal
anterior and posterior oblique

Question 8

radial carpometacarpal - where and function

Answer 8

lateral adjacent surfaces of trapezium and 1st MC
reinforces capsule and stabilises joint

Question 9

anterior and posterior oblique - where and function

Answer 9

anterior/posterior trapezium -> medial side of 1st MC
limits flexion (post) and extension (med)

Question 10

flexion/extension ROM

Answer 10

40-50

Question 11

abduction/adduction ROM

Answer 11

80

Question 12

phases of opposition

Answer 12

phase 1 - abduction
phase 2 - flexion + medial rotation
phase 3 - adduction