Biomechanics
You try to make a fist with your wrist flexed but are unable to - this demonstrates which concept?
Active Insufficiency
________________ deformation allows a material to return to its normal shape after the force is removed
Elastic
This structure(s) contributes significantly to the dynamic stability of the glenohumeral joint, as when throwing a ball.
Rotator cuff
strongest flexion force with forearm supinated
bicep brachii
this structure stabilizes the ulnar side of the DRUJ
TFCC
A ________________ is measured as the perpendicular distance from the center of rotation to the force.
moment arm
Increased collagen content in a bone will cause the bone to be more __________
Elastic
This rotator cuff muscle primarily externally rotates the glenohumeral joint; it is particularly active when washing your hair or putting on a shirt overhead.
Infraspinatus
Increased medial angulation of the elbow
Cubitus Varus
What is boutonniere deformity?
flexed PIP, hyperextended PIP
Increasing the perpendicular distance from a joint to the muscle acting on the joint will have what effect?
This will increase the moment arm of that particular muscle to move the joint
As a muscle stretches, tension on the ____________________ increases, causing a spring effect.
Parallel Elastic components
Which of the following muscles DOES NOT contribute to upward rotation of the scapula?
Rhomboid major
An athlete who continuously strains the medial collateral ligament (MCL) of the elbow with elongation/laxity of the ligament would me most likely to also experience:
Cubital tunnel
This tendon forms for ulnar border of the "anatomical snuffbox"; it also extends the IP joint of the thumb, as when flipping a coin or giving a "thumb's up".
Extensor Pollicis Longus
A ligament which reaches its yield point under a sustained, increasing force will demonstrate this prior to rupturing completely:
Plastic deformation
zero contraction velocity – no visible change in muscle length
isometric contraction
Name 5 movements of shoulder glenohumeral joint
°Flexion/Extension
°Abduction/Adduction
°External Rotation/Internal Rotation
°Horizontal abduction/adduction
Scaption
The radial head is stabilized against the proximal ulna by this ligament:
annular Ligament
Which bones make up the proximal carpal row?
Scaphoid, lunate, triquetrum, pisiform
linear movement in which all points travel same distance
translation
°Contrasting/inhibiting muscle
antagonist muscle
Past 30º, scapula rotates upward at 2:1 ratio; what is this termed as
Scapulohumeral rhythm
What structures are most highly involved in golfers elbow?
Extensor carpi radialis brevis
If a patient has weakness of lumbrical grip what nerve is impacted?
Ulnar Nerve