STUDY GUIDE1.2008 - STUDY GUIDE BIOMECHANICS II Suzanne...

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STUDY GUIDE – BIOMECHANICS II Suzanne Ishii, DPM The Adult Foot Radiographic biomechanics review 1. Define the following angles: lesser tarsus, forefoot adductus/abductus, metatarsus, intermetatarsal, talocalcaneal, calcaneal inclination, talar declination, Boehler’s 2. Explain the significance of the talar-navicular articulation 3. Identify the cyma line 4. Identify the findings associated with a pronated, supinated, or neutral position of the foot. Digital deformities 1. Describe the difference between weight bearing and non-weight bearing at the PIPJ and MPJ with activation of the FDL and FDB. 2. What is the main function of the quadratus plantae muscle? 3. The interossei muscles stabilize the digits in which plane? 4. To create a rigid beam effect, which activate first, the interossei or the FDL and FDB? 5. Name 3 functions of the lumbricales. 6. To prevent excessive dorsiflexion of the MPJ’s during swing, which activate first, the EDL and EDB or the lumbricales? 7. What is the main cause of flexor stabilization? What clinical conditions can cause this? 8. What is the main cause of extensor substitution? What clinical conditions can cause this? 9. What is the main cause of flexor substitution? 10. Name the supinators of the foot in open kinetic chain and closed kinetic chain. Improving the ROM of the 1 st MTP Using Functional Orthoses 1. What two deformities result fro the presence of the pathology Functional Hallux Limitus? 2. Define “freedom of motion” as it relates to this topic 3. Define “dislocation moment”. 4. Does the let internally or externally rotate with STJ pronation? 5. What three foot types are the probable causes of 1 st met dorsiflexion? 6. As the MTJ supinates, what happens to the 1 st met base (and consequently the 1 st met head)?
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7. As the 1 st ray dorsiflexes, what happens to the axis of motion of the 1 st MPJ? Is this “bad” or “good”? 8. What happens to the 1 st met with a large MTJ ROM? Small MTJ ROM? 9. What 3 factors are essential for the development of functional hallux limitus 10. Are changes in the development of functional hallux limitus directly related to RCSP? The Severely Pronated Foot/ Acquired flat foot 1. Where does a “normal” STJ pass (from posterior to anterior)? 2. What is the significance of a medially deviated STJ axis? 3. Pick a point on the foot. When GRF is placed at that point, how does the effect differ in a medially deviated STJ axis vs. a normal axis? 4. What are the mechanical characteristics of a severely pronated foot? 5. What anatomic structure stops pronation? 6. Why is the medial calcaneus the best area to generate a supination moment in a foot with a medially deviated STJ axis? 7.
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This note was uploaded on 04/19/2008 for the course BIOMECHANI Biomechani taught by Professor Dr.ishii during the Spring '08 term at Samuel Merritt.

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STUDY GUIDE1.2008 - STUDY GUIDE BIOMECHANICS II Suzanne...

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