EXSC 261 - Knee joint

Rectus femoris

Rectus femoris Origin

Anterior inferior iliac spine, posterior groove above acetabulum

Rectus femoris Insertion

Superior aspect of patella and patellar tendon to the tibial tuberocity

Rectus femoris Movement

Flexion of hip, extension of knee

Rectus femoris Nerve

Femoral nerve L2-L4

Vastus Lateralis

Vastus Lateralis Origin

Intertrochanteric line, anterior and inferior borders of the greater trochanter, upper half of linea aspera and the entire lateral intermuscular septum

Vastus Lateralis Insertion

Lateral border of patella, patellar tendon to tibial tuberocity

Vastus Lateralis Movement

Extension of knee

Vastus Lateralis Nerve

Femoral nerve L2-L4

Vastus intermedius

Vastus intermedius Origin

Upper 2/3 of anterior surface of femur

Vastus intermedius Insertion

Upper border of patella and patellar tendon to the tibial tuberocity

Vastus intermedius Movement

Extension of knee

Vastus intermedius Nerve

Femoral nerve L2-L4

Vastus medialis

Vastus medialis Origin

Whole length of linea aspera and medial condyloid ridge

Vastus medialis Insertion

Medial half of the upper border of the patella and patellar tendon to the tibial tuberocity

Vastus medialis Movement

Extension of knee

Vastus medialis Nerve

Femoral nerve L2-L4

Semitendinosus

Semitendinosus Origin

Ischial tuberocity

Semitendinosus Insertion

Upper anterior surface of tibia

Semitendinosus Movement

Extension and internal rotation of hip, flexion and internal rotation of knee

Semitendinosus Nerve

Sciatic nerve tibial division L5, S1, S2

Semimembranosus

Semimembranosus Origin

Ischial tuberocity

Semimembranosus Insertion

Posteromedial surface of medial tibial condyle

Semimembranosus Movement

Extension and internal rotation of hip, flexion and internal rotation of knee

Semimembranosus Nerve

Sciatic nerve tibial division L5, S1, S2

Biceps femoris

Biceps femoris Origin

Ischial tuberocity, lower half of linea aspera, lateral condyloid ridge

Biceps femoris Insertion

Lateral condyle of tibia, head of fibula

Biceps femoris movement

Extension and external rotation of hip, flexion and external rotation of knee

Biceps femoris Nerve

LONG HEAD - sciatic nerve tibial division S1-S3

SHORT HEAD - sciatic nerve fibular division L5, S1, S2

Popliteus

Popliteus Origin

Posterior surface of lateral condyle of femur

Popliteus Insertion

Upper posterior medial surface of tibia

Popliteus Movement

Flexion of knee, internal rotation of flexed knee

Popliteus Nerve

Tibial nerve L5, S1

Knee joint

• largest in the body

• Primarily hinge joint

Fibula is

Not part of the knee joint

Bursae

Absorb shock or prevent friction, more than 10 around knee

Quadriceps muscles

Rectus femoris, Vastus lateralis, Vastus intermedius, Vastus medialis

Hamstring muscles

Semitendinosus, semimembranosus, biceps femoris

• popliteus assists medial hamstrings in internal rotation of knee

Anterior muscles

Rectus femoris, Vastus lateralis, Vastus intermedius, Vastus medialis

Posterior muscles

Semitendinosus, semimembranosus, biceps femoris, popliteus