lab9 knee-1 - BASICS OF THE KNEE Your Knee Relies on...

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BASICS OF THE KNEE
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Your Knee… Relies on support from 4 ligaments & 2 menisci A NEED muscular strength Ligaments: anterior cruciate, posterior cruciate, medial collateral, lateral collateral Menisci: medial meniscus & lateral meniscus
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Visuals of the knee
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Movements & Muscles of Knee Knee flexion (135-145°): hamstrings, popliteus, gastrocnemius, gracilis, sartorius Knee extension (-10-0°): quadriceps
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Common Injury Locations
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Common Injury: ACL Tear MOI: rapid deceleration, plant-and-twist, shear force, hyperextension S/Sx: hear “pop” or “snap”, swelling within 3 hrs Special Tests: Anterior Drawer, Lachman’s, possibly Pivot Shift **MUST get leg straight before & after surgery…possible “extension lag”
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Common Injury: PCL Tear MOI: hyperextension, fall on flexed knee & plantar flexed foot, posterior displacement of tibia on femur, car accidents S/Sx: knee extension limited, swelling, pn w/ flexion beyond 90
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Common Injury: MCL Sprain/Tear MOI: medially directed (valgus) shear S/Sx: pt tender over medial femoral condyle, unable to reach full extension, toe walking, may feel “pop” Special Tests: Valgus Stress Test
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lab9 knee-1 - BASICS OF THE KNEE Your Knee Relies on...

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