Biomechanics Quiz 10 Flashcards
Eight Carpal Bones are also called what?
“functional spacer”
Primary Articulation of the wrist:
-Radiocarpal Joint
2 parts of the distal forearm:
- styloid process of radius / ulna
2. distal radius
distal forearm - angled how many degrees and toward what?
25* toward ulna (medial)
the ulnar tilt allows for what?
greater ulnar deviation
radial deviation is limited by
styloid process of radius
radial deviation is known as what?
abduction
ulnar deviation is known as what?
adduction
the proximal row of carpal bones (lateral to medial) are mounted in what fashion?
which bones are they?
relatively loose fashion
how are the distal row (lateral to medial) of carpal bones bound?
which bones are they?
tightly by strong ligaments
what does the distal row provide?
rigid and stable base for articulations wth MCs
the transverse carpal ligament connects what bones?
medial bones: (hook of hamate and pisiform) to the lateral bones: (tubercles of scaphoid and trapezium)
What does the Carpal Tunnel prevent?
Prevents “bowstringing”
passageway of carpal tunnel is for what?
for median nerve and extrinsic finger flexor tendons
how many finger flexors in carpal tunnel
8 finger flexor tendons
Intercarpal Joints - what kind of movements occur?
small gliding movements
what are the proximal components of radoiocarpal joint?
-concave radius and adjacent articular disc
what are the Distal components of radoiocarpal joint?
- convex proximal surfaces of scaphoid and lunate
- triquetrum
what does TFCC stand for?
triangular fibrocartilage complex
Osteokinematicsof Wrist Motion - how many degrees of angular freedom (circumduction)
2*
wrist motion - axes pass through which bone?
capitate
Wrist ROM: flexion
0 to 70-85*
Wrist ROM: Extension
0 to 60-75⁰
Wrist ROM: Deviations
- Ulnar: 0 to 35-40⁰
- Radial: 0 to 15-20⁰
when Falling on Outstretched Hand - what is the injury?
colles fracture
colles fractured fractures what?
Scaphoid Fracture
wrist extensors - proximal attachment is where?
on or near lateral epicondyle
what is the role of the wrist extensors?
being able to make a fist
degrees of extension / deviation of wrist extensors?
30-35* wrist extension
and 5* ulnar deviation
Grip strength reduced with what kind of movement?
wrist flexion (shortened finger flexors)
wrist flexors proximal attachment on or near
on or near Medial Epicondyle
HAND has how many bones, articulations, and muscles?
19 bones
19 articulations
29 muscles
arthrology: Finger Movements:
- Flexion/Extension (sagittal)
2. Abduction/Adduction (frontal) middle finger is reference
arthrology: Thumb Movements: • Opposition describes what?
movement of thumb across the palm, making direct contact with the tip of any finger.
arthrology: Thumb Movements: • Reposition describes what?
from full opposition back to anatomic position
what type of joints are the Carpometacarpal (CMC) Joints
synovial joint
Carpometacarpal (CMC) Joints have what kind of movement?
sliding and gliding
Carpometacarpal (CMC) Joints are surrounded by what?
by joint capsules and multiple ligaments
for the hand, abd/add occur in what plane?
sagittal plane
for the hand, m/l occur in what plane?
the frontal plane
the Carpometacarpal is what type of joint?
saddle joint – biaxial, which allows for opposition
the Carpometacarpal is a loose capsule which allows for what?
great ROM
CMC: what is opposition?
Composite of other primary motions
Metacarpophalangeal Joints are which digits #?
Digits 2-5
Metacarpophalangeal Joints: flexion and extension occur in what plane?
sagittal
Metacarpophalangeal Joints: Abduction/Adduction occur in what plane?
frontal
MetacarpophalangealJoint (Thumb) is what type of joint?
hinge joint for flexion/extension
Interphalangeal Joints (Digits 1-5) are what kind of joints? on what plane?
hinge joints for flexion / extension
sagittal
