I Think You're Scared of Being Basic
What happens to the force of gravity as a abducts their arm from 0 degrees to 90 degrees of abduction?
The force of gravity remains unchanged
Identify the proper arthrokinematics at the glenohumeral joint with distal end free (open chain) shoulder abduction
Superior roll and inferior slide of the humerus on the scapula
What motion occurs in the transverse plane at the glenohumeral joint during full shoulder abduction?
GH External Rotation
What structure is responsible for transmitting force proximally from the radius to the ulna when a force is applied against the hand?
Interosseus Membrane
Which portion of the extensor mechanism is responsible for extending the DIP joint?
Terminal tendon
A patient is holding a dumbbell at 90 degrees of elbow flexion. In order to maintain static equilibrium, how must the force of the biceps relate to the force of the dumbbell?
The force of the biceps must be greater than the force of the dumbbell.
Identify the proper arthrokinematics at the sternoclavicular joint with distal end free (open chain) scapular retraction
Posterior roll and posterior slide of the clavicle on the sternum
What is the normal ratio of glenohumeral joint motion to scapular motion with elevation of the arm overhead?
2:1 ratio of GH movement to scapular movement
Identify the appropriate arthrokinematics at the proximal radioulnar joint with distal end free (open chain) pronation
Spin of the radial head on the ulna
Identify the appropriate arthrokinematics at the radiocarpal joint with distal end free (open chain) ulnar deviation
Ulnar roll and radial slide of the carpals on the radius
What is the most important factor when determining the force-generating capability of a muscle?
The cross sectional area of the muscle
Identify the proper arthrokinematics at the humeroulnar joint with distal end fixed (closed chain) elbow flexion
Anterior roll and posterior slide of the humerus on the ulna
Identify the motions that occur at the SC and AC joints with scapular elevation with the arm at the side (shrug)
SC joint elevation and AC joint downward rotation
Which elbow flexor muscle has the greatest cross-sectional area, and is therefore the workhorse of the flexors?
Brachialis
What muscle group is primarily active to maintain the appropriate length of the finger flexors during activities involving grasping?
Wrist extensors
What type of muscle contraction would occur if the internal torque created at a joint is greater than the external torque?
Concentric
Identify the proper arthrokinematics at the distal radioulnar joint with distal end free (open chain) supination
Dorsal roll and dorsal slide of the radius on the ulna
Which shoulder muscle is active during activities requiring forceful elbow flexion in order to prevent unwanted motion at the shoulder?
Posterior deltoid (other shoulder extensors would be an appropriate answer here as well)
What ligament is responsible for limiting excessive supination?
Palmar radioulnar ligament
Which two flexor tendon pulleys are most important for proper function of the finger flexors?
A2 and A4
Movement occuring in the frontal plane will ALWAYS take place around which axis?
Anterior-Posterior
Identify the appropriate arthrokinematics at the 1st CMC joint with distal end free (open chain) thumb abduction
Palmar roll and dorsal slide of the 1st MC on the trapezium
When performing a standing lateral raise, at what degree of shoulder abduction would you require the largest force from the shoulder abductor muscles?
90 degrees of shoulder abduction
Which portion of the ulnar collateral ligament is responsible for limiting valgus stress when the elbow is in extension?
Anterior bundle
What osteokinematics at the MCP, PIP, and DIP joints would place the lumbricals on maximal passive tension?
MCP extension, PIP and DIP flexion