Condyloid Joints

Question 1

What are condyloid joints?

Answer 1

• bi-axial joints that permit all angular motions in the frontal & Sagittal plane

Question 2

What are the movements of condyloid joints?

Answer 2

• flexion/extension
• adduction/abduction
• circumduction

Question 3

What are the 2 condyloid joints?

Answer 3

• radiocarpal joint
• metacarpophalangeal joint

Question 4

What is the classification of the radiocarpal joint?

Answer 4

• structural = synovial
• functional = diarthrosis

Question 5

What are the 4 bones involved with the radiocarpal joint?

Answer 5

• scaphoid, lunate, triquetrum (proximal carpal bones)
• distal radius

Question 6

What are the 4 ligaments that support the radiocarpal joint?

Answer 6

• dorsal radiocarpal ligament (stabilizes the joint, restricts flexion)
• palmer radiocarpal ligament (connects the radius to the carpal bones which stabilize the wrist)
• palmer ulnocarpal ligament (prevents palmer translocation of the ulnar carpal bones, & allows radial deviation of the wrist, & limits ulnar deviation)
• radial collateral carpal ligament (stabilizes the wrist, limits radial deviation)

Question 7

What are the 4 muscles that act on the radiocarpal joint?

Answer 7

• extensor carpi radialis brevis/longus
• extensor carpi ulnaris
• assistance from the extensor digitorum

Question 8

What are clinical findings of the radiocarpal joint?

Answer 8

• radius fractures are one of the most common injuries

Question 9

What is the classification of the metacarpophalangeal joint?

Answer 9

• structural = synovial
• functional = diarthrosis

Question 10

What bones are involved with the metacarpophalangeal joint?

Answer 10

• convex heads of the metacarpal bones which are received by the concave bases of the proximal phalanges

Question 11

What are the 2 ligaments that support the metacarpophalangeal joint?

Answer 11

• proper/accessory collateral ligaments
• deep transverse ligament

Question 12

What are the acting muscles of the metacarpophalangeal joint?

Answer 12

• all the forearm muscles

Question 13

What is a functional movement of the metacarpophalangeal joint?

Answer 13

• gripping

Question 14

What is a clinical finding of the metacarpophalangeal joint?

Answer 14

• gamekeeper’s thumb or skiers thumb is a fairly common injury of the ulnar collateral ligament of the MCP of the thumb
• the most common way to injure this is by falling onto an outstretched arm with an abducted thumb