Radiocarpal Joint

Question 1

Type of Joint

Answer 1

Synovial ellipsoid capable of 2 degrees of freedom-
Flex/ext - 85deg
Add/abd - 45/15deg

Question 2

Articular Surfaces and Capsule

Answer 2

Concave distal surface of radius and intra-articular disc and convex surface of prox row of carpal bones linked by interosseous ligts

Capsule attaches prox to distal margins of radius and ulna ant/post, med/lat to radial and ulnar styloid processes, distally to ant/post margins of prox carpal row

Question 3

Supporting Ligaments

Answer 3

CLs reinforce and support lat and med aspect of capsule:
Radial- from radius to scaphoid and trapezium
Ulnar- ulna to triquetrum and pisiform

Dorsal/Palmar radiocarpals:
-from radius to scaphoid, lunate and triquetral

Question 4

What makes it stable?

Answer 4

Many tendons crossing joints
Ant/post/med/lat ligts
Tendons bound by retinaculums
Radio/intercarpal ligts
Ext with rad dev when in closed-packed
Flexor retinaculum 
-considered accessory ligt
-attaches to pisiform, hamate, scaphoid, trapezium
-forms root of carpal tunnel (which medial nerve runs through)