Quads (Quadriceps Muscles)
The Quad's (Quadriceps) are a group of four muscles found in the front of the thigh. Their main function is to straighten the knee joint from a bent position.
The four quadriceps muscles are:
- Rectus Femoris
The largest quad muscle which is most commonly injured.
- Vastus Medialis
Found on the inner front of the thigh.
- Vastus Lateralis
Found on the outer front of the thigh
- Vastus Intermedius
Found centrally but deep, under the rectus femoris
All of these muscles straighten the knee. The Rectus Femoris muscle also flexes the hip (lifts the thigh upwards).
All four muscles converge at the level of the patella (kneecap) to form the patella tendon. The patella is a sesamoid bone which sits inside this tendon.
Common injuries to the quad muscles include a quad strain (tear), a quad contusion (often known as a dead leg or a charley horse), myositis ossificans (after a contusion) and rectus femoris tendon tears.