Knee pain is a common complaint that affects people of all ages. Knee pain may be the result of an injury, such as a ruptured ligament or torn cartilage.

1. CAUSES OF
KNEE PAIN
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2. Overview
A knee injury can affect any of the
ligaments, tendons or fluid-filled
sacs (bursae) that surround your
knee joint as well as the bones,
cartilage and ligaments that form
the joint itself.

3. ACL INJURY
An ACL injury is a tear or sprain of the
anterior cruciate (KROO-she-ate) ligament
(ACL) — one of the strong bands of tissue
that help connect your thigh bone (femur)
to your shinbone (tibia). ACL injuries most
commonly occur during sports that involve
sudden stops or changes in direction,
jumping and landing — such as soccer,
basketball, football and downhill skiing.

4. Symptoms
A loud pop or a "popping" sensation in the knee
Severe pain and inability to continue activity
Rapid swelling
Loss of range of motion
A feeling of instability or "giving way" with weight
bearing
Signs and symptoms of an knee injury usually include:

5. Risk Factor
Excess Weight- Being overweight or obese
increases stress on your knee joints, even
during ordinary activities such as walking or
going up and down stairs
Lack of muscle flexibility or strength.- A lack of
strength and flexibility can increase the risk of knee
injuries.