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Biomechanics 1 final exam USAHS with Verified solutions| Rated A+

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Biomechanics 1 final exam USAHS with Verified solutions| Rated A+

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  • October 16, 2024
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  • 2024/2025
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Biomechanics 1 final exam USAHS with
Verified solutions| Rated A+

What are the four types of heel-strikes? - ✔✔Splatfoot, rearfoot, midfoot, and forefoot

How is the first ray involved in triplanar motion? - ✔✔Peroneus longus attaches to the first ray

Screw home mechanism of the knee - ✔✔As the length of the medial femoral condyle is longer than
the length of the lateral condyle, the tibia rotates externally about 15° on the femur during the last 20°
of extension.

Genu varum vs genu valgum - ✔✔Varum- bow legged

Valgum- knock kneed

Coxa vara vs coxa valga - ✔✔Vara- <120




Valga- >135




Normal is 120-135

_____ ___________ of anteversion is normal. Any less is considered retroversion and anymore is
considered excessive anteversion. - ✔✔12-15 degrees

True or false:

8 degrees of anteversion is considered retroversion. - ✔✔True

Tight hip flexors pull the pelvis into a(n) __________ tilt. - ✔✔Anterior

What muscles IR the hip? Which is most powerful? - ✔✔TFL, gracilis, glute med/min, and the
adductors (not sure most powerful i think add mag)

, What muscles ER the hip? Which is most powerful? - ✔✔Glute max is most powerful

Glute max, piriformis, obturators, gemelli, quadratus femoris

True or false:

The piriformis is an ER until 90 degrees of hip flexion then it becomes an IR. - ✔✔True

Actions of glute medius - ✔✔Abduction and IR of the hip (superior gluteal L4, L5 S1)

During a forward bend the glute max contracts _____________. - ✔✔Eccentrically

At what degree do the hip and knee experience the most external torque in a squat? - ✔✔

Trendelenburg gait - ✔✔Weak abductors, particaularly glute med. causes leaning toward weak
side during gait

Other deviations - ✔✔

Vaulting gait - ✔✔

Subtalar closed chain pronation - ✔✔Midfoot: pronated

Forefoot: supinated

A ___________ foot is more rigid. - ✔✔Supinated

What are the traditional and rancho terms for the swing phase? - ✔✔Traditional-
acceleration, midswing, deceleration

Rancho los amigos- initial swing, midswing, terminal swing

What are the ground reaction forces during the heel-strike (initial contact) phase? -
✔✔Ankle plantarflexion, knee extension, hip flexion

What are the ground reaction forces during the foot-flat (loading response) phase? -
✔✔Ankle plantarflexion, knee flexion, hip flexion

What are the ground reaction forces during the mid-stance phase? - ✔✔Ankle dorsiflexion,
knee extension, hip extension

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