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PT 506 Biomechanics
Terms in this set (13)
If the median nerve was injured at the level of the wrist, list all of the motor impairments and sensory impairments after the level of the wrist.
motor impairment (muscles that are affected):
- flexor pollicis brevis
- abductor pollicis brevis
- opponens pollicis
- 1st lumbrical
- 2nd lumbrical
will have problems abducting, flexing, opposing thumb as well as flexing MCPs, and extending IPs
- thumb, radial 2 1/2 fingers in palmar surface
- tips of fingers 1-3 and radial half of 4th digit on dorsal surface
If the motor function was preserved and only sensory impairments existed, would manipulation still be difficult?
yes, because you can't feel or grip pressure
Contraction of the intrinsic (lumbricals and interossei) produce _________________ in the extensor hood mechanism.
The lumbricals and interossei help __________________ the fingers.
The central tendon of the extensor hood mechanism extends the _________ joint.
The lateral bands of the extensor expansion extend the _____________ joint.
Explain how the lumbricals can both flex the MCPs and extend the IPs in the intrinsic plus position.
due to their attachment to the extensor expansion, they also obliquely attach to the extensor expansion near extensor digitorum
What is the position of the hand when performing a passive strertch of your partner's instrinsic lumbrical muscles?
flex the IPs and extend the MCPs (elongate lumbricals over MCPs)
Why can you achieve full finger flexion when extending the wrist as opposed to when positioning your hand to maximal active insufficiency (flexing the wrist and flexing the fingers)?
because of the length tension relationship, you produce more force in extension
In what wrist position are we best suited to bear weight through our hands?
in wrist extension because of the congruency of the radius and the carpal bones are nice and tight
When hammering a nail, what muscles are working and how?
ulnar deviators concentrically
elbow extensors concentrically
working with gravity to generate enough force to drive the nail
enhance joint stability
- supports DRUJ
- adds to articular surface of radius
- compensates for shorter ulna in load transmission
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