Hand, Fingers & Thumb Anatomy + Positioning & Technical Factors

Label All The Letters

A) CMC Joint

B) 1st Digit Metacarpal

C) MIP Joint

D) Proximal Phalanx

E) IP Joint

F) Distal Phalanx

G) 2nd Digit MCP Joint

H) 2nd Digit Proximal Phalynx

I) 2nd Digit PIP Joint

J) 2nd Digit Middle Phalynx

K) 2nd Digit DIP Joint

L) 2nd Digit Distal Phalynx

M) 4th Digit Middle Phalynx

N) 5th Digit DIP Joint

O) 3rd Digit Proximal Phalynx

P) 5th Digit MCP Joint

Q) 4th Digit Metacarpal

R) 5th Digit CMC Joint

Label the Letters

A) scaphoid

B) lunate

C) triquetrum

D) pisiform

E) trapezium

F) trapezoid

G) capitate

H) hamate

Label the Lines

Bottom (L→R): pisiform, triquetrum, lunate & scaphoid

Top (L→R): hamate, capitate, trapezoid, trapezium

What Kind of Joints are 1-5 MCPs, 2-5 CMCs, 1st CMC & 1-5 IPs?

• 1-5 MCPs: ellipsoidal (condyloid type)

• 2-5 CMCs: plane (gliding) type

• 1st CMC: sellar (saddle) joint

• 1-5 IPs: ginglymus (hinge) type

What Kind of Joints Does the Radiocarpal Joint Have?

1. synovial (diathrodial)

2. ellipsoidal (condyloid)

   

Positioning Considerations for Upper Limb

• 40 inch (100cm) minimum SID

• gonadal shielding

• four-sided collimation when possible

• long axis of part to long axis of IR

• side marker visible

Exposure Factors of Fingers, Hand & Thumb

• low kVp: 55-65 kVp

• short exposure time

• small focal spot

• proper exposure factors

  • fat pad visualization

  • trabecular markings on bone

• no grid needed

• adjust technical factors for cast