The knee joint l.jpg
Sponsored Links
This presentation is the property of its rightful owner.
1 / 50

THE KNEE JOINT PowerPoint PPT Presentation


  • 253 Views
  • Updated On :
  • Presentation posted in: General

THE KNEE JOINT. Muscles That Act On The Knee. Muscles of the Knee Joint. Hamstrings All - flexion Quadriceps All - extension Unclassified Sartorius - flexion and internal rotation Gracilis - flexion and internal rotation Popliteus - flexion (unlocking) and internal rotation

Download Presentation

THE KNEE JOINT

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


THE KNEE JOINT

Muscles That Act On The Knee


Muscles of the Knee Joint

  • Hamstrings

    • All - flexion

  • Quadriceps

    • All - extension

  • Unclassified

    • Sartorius - flexion and internal rotation

    • Gracilis - flexion and internal rotation

    • Popliteus - flexion (unlocking) and internal rotation

    • Gastrocnemius - flexion


Anterior Muscles

  • Quadriceps

    • knee extension


Quadriceps Muscles


Rectus femoris

  • Two joint muscle; most superficial

  • Origin: anterior-inferior iliac spine of the ilium

  • Insertion: top of the patella and patellar ligament to the tibial tuberosity

  • Actions:

    • Extension of the knee


Vastus lateralis

  • Origin: Lateral lip of linea aspera.

  • Insertion: Outer half of the upper border of the patella and the patellar ligament and the anterior tuberoscity of the tibia

  • Action:

    • Extension of the knee


Vastus intermedius

  • Origin: Upper 2/3 of the anterior surface of the femur

  • Insertion: Upper border of the patella and the patellar ligament

  • Action:

    • Extension of the knee


Vastus medialis

  • Origin: Medial lip of the linea aspera and the internal condyloid ridge

  • Insertion: Inner half of the upper border of the patella nd patellar ligament

  • Action:

    • Extension of the knee


VLRFVM

VL RF VM


1

3

2

Hamstrings

Quadriceps

  • Vastus Lateralis

  • Vastus Intermedius

  • Rectus Femoris

  • Vastus Medialis


QUADRICEPS MUSCLES

  • Vertical jumping

  • Decelerating or eccentric contraction during landing or changing directions

  • As a group, they are typically 25-30% stronger than the hamstrings


Posterior Knee Muscles


Hamstrings

  • knee flexion


Biceps femoris

  • Lateral side

  • Origin:

    • 1.) Long head - ischial tuberosity;

    • 2.) Short head - lower half of the linea aspera

  • Insertion: Head of the fibula

  • Action:

    • Flexion of knee


Semitendinosus

  • Medial side; superficial

  • Origin: Ischial tuberosity

  • Insertion: Anterior medial surface of the tibia

  • Action:

    • Flexion of the knee


Semimembranosus

  • Medial side, deeper than semitendonosus

  • Origin: Ischial tuberosity

  • Insertion: Anterior medial surface of the tibia

  • Action:

    • Flexion of the knee


HAMSTRING MUSCLES

  • More “knee flexors” than “hip extenders”

  • Acceleration muscles during running

  • Tight hamstring muscles can contribute to lower back, hip and knee problems


Gracilis

  • O: Pubis crest

  • I: Anterior medial surface of the tibia

  • Actions:

    • flexion at the knee


Sartorius

  • Posterior at the knee joint

  • Origin: Anterior-superior spine of the ilium

  • Insertion: Anterior medial surface of the tibia

  • Action:

    • Flexion at the knee

    • From Late Latin sartor, tailor (from its producing the cross-legged position of a tailor at work)


Popliteus

  • Origin: Lateral condyle of the femur

  • Insertion: Proximal third of posterior aspect of the tibia

  • Action:

    • Flexion of the knee

    • It "unlocks" the knee.

  • Only true knee flexor


Gastrocnemius

  • Origin: posterior surface of the medial and lateral femoral condyles

  • Insertion: the calcaneus through the Achilles tendon

  • Actions:

    • Flexion of the knee

Posterior


Review

  • Superficial Leg Muscles


Name the muscle and its action(s)

Sartorius

Action: Flexion at the knee


Q Angle

Valgus

Varus

The deviation between the line of pull of the rectus femoris and the patellar ligament.

Stress to lateral side of the knee

Stress to the medial side of the knee

Terms


Semimembranosus

Name the muscle and its action(s)

  • Action:

    • Flexion of the knee


  • Anterior cruciate ligament

  • Lateral collateral ligament

  • Lateral meniscus

  • Posterior cruciate ligament

  • Medial collateral ligament

  • Medial meniscus

1.

2.

3.

4.

5.

6.


Semitendinosus

Name the muscle and its action(s)

  • Action:

    • Flexion of the knee


1 = PCL

2 = Lateral meniscus

3 = ACL

4 = Medial meniscus

1.

4.

2.

3


Name the colored muscles

2 = Vastus lateralis

1 = Rectus femoris

4 = Vastus medialis


? =

? =

? =

Lateral condyle

Medial condyle

Intercondylar fossa

Femur


Name the muscle and its action(s)

Gracilis

Action - flexion at the knee


? =? =

? =

Medial condyle

Lateral condyle

Medial Malleolus

Tibia


2.

3.

1.

  • = Vastus lateralis

  • = Rectus femoris

  • = Vastus medialis


VLRFVM

VL RF VM


Rectus femoris

Name the muscle and its action(s)

  • Actions:

    • Extension of the knee


1.

2.

3.

3.

4.

1. = Anterior cruciate ligament

2. = Lateral collateral

3. = Lateral meniscus

3. = Medial collateral

4. = Medial mieniscus


Name the muscles.

1 = Vastus lateralis

2 = Vastus intermedius

3 = Vastus medialis

1.

2.

3.


Fibula

? =

? =

Head

Lateral malleolus


Name the muscles

  • Biceps femoris

  • Biceps femoris

  • Semitendonosis

  • Semimembranosis


Biceps femoris

Name the muscle and its action(s)

  • Action:

    • Flexion of knee


Medial condyle

Lateral condyle

Medial Malleolus

Tibia

? =?=

? =


Popliteus

Name the muscle and its action(s)

  • Action:

    • Flexion of the knee


6 = ?

7 = ?

8 = ?

Lateral condyle

Intercondylar fossa

Medial condyle

Femur


Name the muscle and its action(s)

Sartorius

Action: Flexion at the knee


3.

1.

4.

2.

1 = Medial meniscus

2 = PCL

3 = ACL

4 = Lateral meniscus


  • Login