Arthrology: joint bone morphology

Question 1

SC joint superior-inferior

Answer 1

convex: clavicle
concave: manubrium

Question 2

SC joint anterior-posterior

Answer 2

convex: manubrium
concave: clavicle

Question 3

open packed position shoulder

Answer 3

55° abduction, 30° horizontal adduction

Question 4

humeroulnar joint

Answer 4

concave: ulna (trochlear notch)
convex: humerus (trochlea)

Question 5

humeroradial joint

Answer 5

concave: radius (head)
convex: humerus (capitulum)

Question 6

proximal radioulnar joint

Answer 6

concave: ulna (radial notch)
convex: radial head

Question 7

distal radioulnar joint

Answer 7

convex: ulnar head
concave: radius (ulnar notch)

Question 8

radiocarpal joint

Answer 8

concave: radius
convex: proximal carpal bones (scaphoid and lunar)

Question 9

CMC thumb M-L

Answer 9

concave: 1st MC base
convex: trapezium

Question 10

CMC thumb A-P

Answer 10

convex: 1st MC base
concave: trapezium

Question 11

CMC digits 2-5

Answer 11

digits 2-3: articular surfaces locked

digits 4-5
concave: hamate (distal aspect)
convex: MC head 4-5 (proximal end)

allows cupping of hands (flex, IR); roll/glide does not apply

Question 12

MCP 1-5

Answer 12

concave: proximal phalanx (proximal end)
convex: MC head

Question 13

IP 1-5 of hand

Answer 13

concave: distal phalanx, proximal end
convex: proximal phalanx, distal end

Question 14

femoroacetabular joint

Answer 14

convex: femoral head
concave: acetabulum

Question 15

tibiofemoral joint

Answer 15

convex: femur (femoral condyles)
concave: tibia (tibial condyles)

Question 16

talocrural joint

Answer 16

convex: talus
concave: distal tibia

Question 17

subtalar joint anterior portion

Answer 17

convex: talus
concave: calcaneus (anterior, middle facet) and navicular

Question 18

subtalar joint posterior portion

Answer 18

convex: calcaneus (posterior facet)
concave: talus

Question 19

talonavicular joint

Answer 19

convex: talus
concave: navicular

Question 20

MTP

Answer 20

convex: MT head
concave: proximal phalanx (distal end)

Question 21

IP joint of foot

Answer 21

convex: proximal phalanx, distal end
concave: distal phalanx, proximal end

Question 22

bilateral shoulder motion

Answer 22

10-30° lower thoracic EXTENSION with full shoulder elevation

Question 23

unilateral shoulder motion

Answer 23

10-30° thoracic ROTATION and/or SB

Question 24

purpose of scapulohumeral rhythm (3)

Answer 24

1. increase overall shoulder ROM
2. maintain optimal length-tension relationship with GH muscles
3. maintain optimal contact between humeral head and glenoid fossa

Question 25

joints part of scapulohumeral motion

Answer 25

GH, SC, ST, AC