Knee - Anatomy of the Knee Bony Structures Quad muscles...

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Anatomy of the Knee Bony Structures - Tibia: o Comprises the distal portion of the knee o Proximal end forms tibial plateaus, tibial plateaus, articulates with femoral condyles. o Knee hinge joint flexion/extension o Tibial plateaus separated by intercodylar tubercles Medial and lateral tubercle Lateral tibial plateau is smaller compare to medial Tibial plateaus slope posteriorly o Cruciate ligaments and meniscus attach anterior and posterior to tubercles o Distal to plateaus is tibial tuberosity Common insertion for patellar tendon o Distal and anterior to plateaus are lateral and medial condyles Lateral condyle has facet that articulates with head of fibula Facet = extremely smooth surface of bone o Medial to lateral condyle is o GERDYS tubercle – point of muscular attachment - Femur o Makes up proximal section o On the distal end there are medial/lateral condyles Curved spiral shaped Articulate with proximal aspect of the tibia This articulation is the tibiofemoral joint Medial condyle is longer than lateral and slightly more distal Slight external rotation at terminal (full) extension o Femoral condyles project more posterior than they do anterior o Groove between condyles, anteriorly is trochlear or patello- femoral groove o Posteriorly the condyles are separated by intercodylar notch (fossa) Notch more narrow in women o Linea aspera: longitudinal ridge on posterior surface of femur (rough line) o Medial and lateral super condylar lines: lines running from each femoral condyle posteriorly to the linea aspera o Femur is longest and strongest bone o Directly superior to condyle is epicondyle (epi – above) o On medial side of medial epicondyle is adductor tubercle Serves as point of attachment for adductor magnus muscle o Small groove present within medial and lateral condyle to accommodate the medial and lateral meniscus (very shallow) - Patella Quad muscles Tendon Patellar tendon Tibial tuberosity Fibular head Lateral condyle IT Band Gerdys tubercle Popliteal space is located on the posterior aspect of the knee
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o Largest Sesamoid bone in body o Located within the quadriceps o Rounded, triangular bond and has only one articulation with femur o Can only dislocated laterally o Posterior surface has 3 facets Odd 90-135 Medial articulation trochlear groove Lateral o As flexion increases in knee, contact with patella moves proximal Contact begin and 10-20 o flexion, distal contact Full extension is 0 o 45 of flexion, contact in middle 60 flexion, superior aspect 90-135 flexion, odd facet contacts platello-femoral groove - Fibula does not have direct articulation with knee and is a non-weight baring bone o Serves for ligamentous and muscular attachment Joints/Articulations of Knee - Tibio/femoral : femoral condyles sit on plateaus - Patello-femoral - Superior tibiofibular Nervous Innervation - Sciatic nerve provides most of motor and sensory innervation to lower extremity o Comes off of lumbrosacral plexus o
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  • Fall '11
  • Stilger
  • Medial femoral condyle, lateral meniscus, medial tibial condyle, lateral femoral circumflex, lateral tibial plateau

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