Forearm and hand bones/joints

Question 1

Articulating surface: Concave surface of radial head and capitulum of humerus

Answer 1

Radiohumeral joint

Question 2

Articulating surface: trochlear notch of ulna and trochlea of humerus

Answer 2

Ulnohumeral joint

Question 3

Radial/Ulnar humeral joint classification

Answer 3

uniaxial hinge, synovial joint

Question 4

Radial/Ulnar humeral Movements permitted/ plane

Answer 4

Flexion/Extension
Med/Lat axis, Sagittal plane

Question 5

Radial/Ulnar humeral Capsule

Answer 5

Weak anteriorly/posteriorly
Strengthened med/lat by “collateral ligaments”

Question 6

medial / Ulnar collateral

Answer 6

triangular shaped, anterior, posterior, oblique bands
limits “vagus” motion (inward)

Question 7

lat / Radial collateral

Answer 7

fan shaped
limits “varus” motion (outward)

Question 8

articulating surface: edge of radial head, 1/5 articulates w ulna at any time

Answer 8

Proximal radioulnar joint

Question 9

Proximal radioulnar joint classification

Answer 9

uniaxial, pivot
synovial joint

Question 10

Proximal radioulnar joint movements permitted
axis/plane

Answer 10

Supination/pronation
Mechanical axis of radius (no plane)

Question 11

Proximal radioulnar joint Capsule

Answer 11

Continuous w capsule of radio/ulno humeral joints

Question 12

Annular ligament

Answer 12

encircles the radial head and ensures correct radial alignment with respect to the humerus and
ulna

Question 13

Oblique cord

Answer 13

attaches ulna and radius anteriorly
limits / restricts- supination and inferior radial displacement

Question 14

Olecranon Bursae

Answer 14

Subtendinous: Between olecranon of ulna and triceps tendon
Subcutaneous: between post aspect of olecranon and superficial fascia

Question 15

Fat pads

Answer 15

outside synovial membrane, but inside capsule
offers cushion/protection

Question 16

Articulating surface: Interosseous borders of radius/ulna

Answer 16

middle/intermediate radioulnar joint

Question 17

middle/intermediate radioulnar joint classification

Answer 17

fibrous syndesmosis, amphiaroidal joint

Question 18

interosseous membrane

Answer 18

Attaches between interosseous borders of radius and ulna
fibre direction of the interosseous membrane help w FOOSH

Question 19

Articulating surface: Head of ulna, ulnar notch of radius

Answer 19

Distal radioulnar joint

Question 20

Distal radioulnar joint classification

Answer 20

uniaxial pivot, synovial joint

Question 21

Distal radioulnar joint: movements permitted/plane

Answer 21

Supination & pronation

Question 22

Distal radioulnar joint Capsule

Answer 22

encloses the joint but is deficient superiorly

Question 23

palmar/volar & dorsal radioulnar ligaments

Answer 23

transverse orientation between distal radius & distal surface of ulna

Question 24

trifolar/ triradiate cartilage/ disc

Answer 24

-Attaches between Ulnar notch of Radius and Ulnar styloid
- seperates the distal Radioulnar joint from the wrist bone (radiocarpal joint)
- cushions impact between carpals, radius, and ulna

Question 25

Articulating surface: Distal radius & trifolar cartilage (concave) Proximal row of carpals - scaphoid, lunate

Answer 25

Radiocarpal joint (wrist)

Question 26

Radiocarpal joint classification

Answer 26

biaxial condyloid, synovial joint

Question 27

Radiocarpal joint: movements permitted/ plane

Answer 27

Flexion/Extension med/lat axis, sagittal plane radio ulnar deviation: ant/post axis, frontal plane

Question 28

Radiocarpal joint Capsule

Answer 28

attaches distal radius and ulna, and proximal carpals with numerous folds

Question 29

Palmar radiocarpal ligament

Answer 29

long & short radiolunate, radioscaphoid & radiotriquetral bands limit / restrict- wrist extension, cause the hand to follow radius in supination

Question 30

posterior radialcarpal ligament

Answer 30

attaches distal radius and radial styloid to triquetrum and lunate limit / restrict- wrist flexion, cause the hand to follow radius in pronation

Question 31

ulnocarpal ligament (anterior and posterior)

Answer 31

attaches ulna and trifolar cartilage to lunate and capitate and triquetrum limits wrist extenion/flexion

Question 32

Medial/ulnar collateral

Answer 32

* attaches between ulnar styloid and triquetrum * limits / restricts- radial deviation, strengthens capsule

Question 33

lateral/radial collateral

Answer 33

* attaches between radial styloid, scaphoid, trapezium and 1st metacarpal * limits / restricts- ulnar deviation, strengthens capsule

Question 34

Articulating surface: proximal row of carpals: Scph, lun, triq (concave) Distal row: trpzm, trpzd, cap, ham (Convex)

Answer 34

Intercarpal / midcarpal joint

Question 35

Intercarpal / midcarpal joint classification

Answer 35

nonaxial plane, synovial joint

Question 36

Intercarpal / midcarpal joint movements permitted/ plane

Answer 36

gliding motion at the midcarpal joint occurs primarily with wrist flexion - extension and ulnar - radial deviation

Question 37

interosseous ligaments

Answer 37

attach between carpals (same row) limits joint distraction