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40 Cards in this Set
- Front
- Back
Supporting ligaments of the sacroiliac joint
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dorsal sacroiliac
ventral sacroiliac sacrotuberous |
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Conclusions about motion at the sacroiliac joint
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capable of small motion
rotation and translation occur together lots of factors affect motion - age, gender, ligaments, etc. |
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the socket of the acetabulum is oriented
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lateral, inferior, anterior
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ligaments of the hip joint
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iliofemoral, ischiofemoral, pubofemoral
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iliofemoral ligament resists -
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lateral rotation, adduction
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pubofemoral ligament resists -
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abduction
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ischiofemoral ligament resists -
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internal rotation, abduction
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Coxa valga
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angle between femoral neck and shaft greater than 130 degrees: less bending on femoral neck, decreased articulating surface, joint stress increased, decreased abductor MA
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Coxa vara
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angle between femoral neck and shaft less than 130 degrees: more bending on femoral neck, greater articulating surface, joint stress decreased, increased abductor MA
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actions of psoas major
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primary hip flexor
some lateral rotation increases lumbar lordosis |
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actions of gluteus maximus
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primary hip extensor
greatest lateral rotator abduction, adduction |
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abductors of hip and their main role
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gluteus medius and minimus
stabilize pelvis during single limb stance |
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actions of adductor magnus
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largest hip adductor
extend hip some portions help with rotation stabilize pelvis during weight shift |
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actions of the lateral rotators of the hip
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laterally rotate hip
dynamic stabilizers of hip actions are altered by hip position |
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medial rotators of the hip
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there are no primary medial rotators!
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tibiofemoral motion during flexion
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• Femur rotates posteriorly
• Laterally rotates • Abducts • Translates anteriorly |
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tibiofemoral motion during extension
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• Femur rotates anteriorly
• Medially rotates • Adducts • Translates posteriorly |
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medial collateral ligament of the knee
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Larger than lateral and has deep and superficial layers
Withstands valgus stress More substantial because valgus stress is more common |
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lateral collateral ligament of the knee
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Cord-like, and does not attach to meniscus
Withstands varus stress |
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characteristics of cruciate ligaments
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intracapsular and extrasynovial
mainly limit anterior/posterior translation, but also rotation |
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anterior cruciate ligament
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limits anterior glide of tibia on femur
tightest in knee extension |
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posterior cruciate ligament
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limits posterior glide of tibia on femur
tightest in knee flexion limits varus and valgus as well |
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normal alignment of the knee joint
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frontal plane - small amount of valgus
sagittal plane - 180 degrees |
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extensors of the knee
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rectus femoris
vastus intermedius vastus lateralis vastus medialis |
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actions of the rectus femoris
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knee extension
hip flexion some hip lateral rotation and abduction |
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actions of the three vasti
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intermedius - knee extension, pulls patella proximally
lateralis - knee extension medialis - knee extension, patellar stabilization |
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actions of hamstrings
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knee flexion and rotation
hip extension contribute to knee joint stability |
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medial rotators of the knee
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sartorius and gracilis
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actions of sartorius and gracilis
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S - hip flexion, abduction, lateral rotation; knee flexion
G - knee flexion, medial rotation; hip adduction |
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pes anserinus
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gracilis, sartorius, and semitendanosus
the medial rotators and dynamic stabilizers of the knee |
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actions of the tensor fascia latte
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hip flexion, abduction, and medial rotation
knee extension and lateral rotation stabilizes pelvis over stance limb |
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lateral collateral ligaments of the ankle
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anterior talofibular
posterior talofibular calcaneal fibular |
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closed chain pronation of the foot
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knee flexes
tibia and talus rotate medially calcaneous everts foot is loose bag of bones |
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closed chain supination of foot
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knee extends
tibia and talus rotate laterally calcaneous inverts foot is stronger, allowing for firm strike and lift off |
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actions of anterior tibialis
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largest dorsiflexor
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achilles tendon
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strongest in body
largest MA of all muscles stores energy and increases plantarflexion efficiency |
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actions of gastrocnemius
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plantarflexes ankle
secondary inverter of ankle flexes knee |
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actions of soleus
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plantarflexes ankle
secondary inverter of ankle |
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actions of posterior tibialis
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primary inverter of ankle because of large MA and large PCSA
secondary plantarflexor supports medial arch |
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actions of the peroneus longus and brevis
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primary everters of foot
secondary plantar flexor |