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OCPM Biomechanics Material Mechanics Part 2
Quesions
26
Medical
Professional
06/14/2009

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Term
What is Wolff's Law?
Definition
There is an interdependence between the form and the function of the human body.
Term
How does Wolff's Law relate to bone?
Definition
Bone is able to re-orient itslef through a process of rearrangement of its trabeculae and lamellae system relationships in response to mechanical tension and stress OR Bone adapts and laters its structure in response to stress.
Term
What is Davis's Law?
Definition
Same as Wolff's Law but for Soft Tissue
Term
What is the effect of Positive current on bone?
Definition
Results in reabsoption of bone convex stress or tension on bone will result in bone resorption.
Term
What is the effect of Negative current on bone?
Definition
Results in osteogenesis in bone, concave stress of compression on bone will cause bone formation.
Term
Wollf's Laws in aciton is a quick process in adults?
Definition
FALSE
Term
What is compression of a muscle?
Definition
Shortening of muscle.
Term
What is tension of a muscle?
Definition
Pull of the muscle
Term
T/F As Compression of a muscle increases, Tension of the muscle decreases.
Definition
TRUE, like in curling weight
Term
T/F Muscle contraction during midstance primarily performs a stabilizing function on the foot bones?
Definition
TRUE
Term
What are the Primary muscles involved in stabilizing the bones of the lesser tarsus during midstance?
Definition
Soleus, Peroneus Longus, Tibialis Posterior and Peroneus Brevis.
Term
Why doesn't the Gastroc help in stabilization of the bones of the lesser tarsus?
Definition
B/c is is extending during midstance and cannot help stabilize when it doing so.
Term
What muscles are involved in stabilization of the Metatarsal bones?
Definition
Intrinsic Muscles of the Foot.
Term
T/F Stabilization of the Metatarsals is independent of the stabilization of the Lesser Tarsus?
Definition
FALSE, very dependent
Term
What muscles are involved in stabilization of the 2nd, 3rd, and 4th Rays during midstance?
Definition
In the first half - FDL and TP In Late Midsatnce - Intrinsic Muscles resist dorsiflexion. In the Last half of Midstance the above muscles are assisted by the QP and Lumbricales.
Term
Which muscles provide transverse stability of the Metatarsal Bones and Lesser Tarsus?
Definition
PL, TP and Soleus
Term
Which muscles are involved in stabilitiy of the 1st Ray during midstance?
Definition
PL stabilizes at the base of the 1st Met in a plantar, posterior and lateral direction. The AH and FHL reinforce the 1st Ray stability.
Term
What muscles are involved in stabilization of the 5th Ray during midstance?
Definition
None
Term
T/F The 5th Ray is very dependent on the STJ function for movement and stability?
Definition
TRUE
Term
What muscles stabilize the Tibia during midsatnce?
Definition
TP, Soleus and the long digital flexors are the prime movers to start Subtalar Supination. Gastroc functions to accelerate external rotation, the other calf muscle externally rotates the lower leg.
Term
What events stabilize the Tibia during midstance?
Definition
Acceleration of STJ supination and exteral leg roation occurring.
Term
What is the primary muscle of supinaiton?
Definition
Tibialis Posterior
Term
What muscles resist supination and control the rate of STJ supination during midstance?
Definition
Peroneus Brevis and Longus.
Term
What action do we see at the ankle joint during midstance as the tibia progresses forward on a foot fixed on the ground?
Definition
Dorsiflexion.
Term
What muscle help to declerate forward momentum of the Tibia?
Definition
TP, Soleus, Long Digital Flexors and some assistance from the PL
Term
What is the main funciton of the Gastrocnemius during midstance?
Definition
To prevent uncontrolled extension of the Knee.
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