The Knee, Quadriceps, and Hamstrings

1
Chapter 7

• The Knee, Quadriceps, and Hamstrings

2
Knee facts

• Largest joint in the body.
• Structurally very weak.
• Unstable bone structure.

3
Bones of the knee

• Femur Large upper leg bone, longest, strongest
  in human body.
• Tibia Weight bearing bone of lower leg.
• Fibula Smaller, non-weight bearing bone of lower
  leg.
• Patella Circular disc protecting the knee
  jointkneecap.

4
(No Transcript)
5
Knee anatomy

• Medial and lateral condyles of femur.
• Patellar notch.
• Tibial tuberocity.

6
Knee anatomy cont
7
Knee anatomy cont
8
Ligaments of the knee

• Anterior Cruciate Ligament
• Posterior Cruciate Ligament
• Lateral Collateral Ligament
• Medial Collateral Ligament

9
(No Transcript)
10
Shock absorbers

• Meniscus (medial and lateral).
• Fatty pads
• Bursa sacs
• Synovial sacs

11
Muscles

• The knee is dependent on good muscle support.
• Numerous muscles support the knee.

12
Muscles cont

• Quadriceps
• Vastus medialus
• Vastus lateralis
• Vastus intermidius
• Rectus femoris

13
Muscles cont

• Hamstrings
• Semitendinosus
• Semimembranosus
• Biceps femoris
• Hamstring muscles are known as a natural knee
  brace by many trainers.

14
Muscles cont

• Sartorius
• Popliteus
• Gastrocnemius
• Adductors
• Adductor longus
• Adductor brevis
• Adductor magnus
• Gracilis

15
Muscles cont

• Abductors
• Gluteus maximus
• Gluteus minimus
• Gluteus medius
• Tensor Fascia Latea

16
The Female Knee

• Females often experience more knee
  problems/ligament tears than males due to the
  angle that the femur rests on the tibia. Females
  hips are wider than males, thus, the femur
  connects with the tibia at an angle.

17
(No Transcript)
18
Injuries

• Unhappy Triad
• Anterior Cruciate Ligament
• Medial Colateral Ligament
• Medial meniscus.

19
Osgood-Schlatters

• Common to adolescent males
• Swelling, pain, irritation below one or both
  knees.
• Aggravated by activity (running, jumping,
  kneeling).
• Pulling on the tibial tuberosity by the patellar
  tendon.

20
Knee injuries cont

• Dislocations

21
Ligament (ACL) repair
22
Repair cont
23
Repair cont
24
(No Transcript)
25
Knee replacement
26
Knee replacement cont

• http//www.uwtv.org/programs/displayevent.aspx?rID
  4127
• DSL/Cable (1.5 Mbps)

27
Healthy knee!