3. Ellipsoid joints
• Characters
• Elliptical convex surface of one
bone articulates with
• Elliptical concave surface of
another
• Permit movements in two axes
• Combination of movements cause
circumduction
• e.g. wrist and atlanto-occipital
joints
4. Bones participating
• Above
• Inferior surface of lower end of radius
• Articular disc of inferior radio-ulnar joint
• Below
• Scaphoid, Lunate & Triquetral (L to M)
7. Ligaments - Capsule
• Fibrous covering of the joint
• Attachment
• Proximally
• Articular margins of radius and ulna
• Distally
• Articular margins of proximal row of carpal
bones
• Synovial membrane
• Lines the internal surface of capsule
8. Palmar ligaments
• Palmar radio-carpal ligament
• Proximally
• Ant. margin of lower part of radius
• Distally
• Ant. Surface of scaphoid, lunate,
triquetral & capitate
• Palmar ulno-carpal ligament
• Proximally
• Ant. Margin of articular disc & styloid
process of ulna
• Distally
• Lunate & triquetral
9. Dorsal radio-carpal ligament
• Proximally
• Posterior margin of lower end of
radius
• Distally
• Dorsal surface of scaphoid, lunate &
triquetral bones
10. Collateral ligaments
• Radial collateral ligament
• From styloid process of radius
• To scaphoid & Trapezium
• Ulnar collateral ligament
• From styloid process of ulna
• To Triquetral & Pisiform
17. Carpometacarpal Joint of the Thumb
• First carpometacarpal
• Multiaxial joint
• Synovial joint
• Saddle variety
18. Saddle (sellar) joints
• Articular surfaces are reciprocally
saddle haped
• i.e. concavo-convex
• Allows a wide range of movement
• e.g. first carpo-metacarpal, sterno-
clavicular, incudo-malleolar joints
• Minimal osseous stability
• Rely on static ligaments
