YMMV wrote:
Well, as a 22-year old vegetarian, both my knees were wrecked with chondramalacia. Now at 63, zero-carb diet, perfect knee health. N=1, but I am one of many.
I was rarely overweight as a plant-based runner, but was always fighting systemic inflammation, probably was pre-diabetic, heart problems, injuries, everything "burning up" basically.
Just throwing some facts out here:
What causes chondromalacia patellae?
Your kneecap normally resides over the front of your knee joint. When you bend your knee, the backside of your kneecap glides over the cartilage of your femur, or thigh bone, at the knee. Tendons and ligaments attach your kneecap to your shinbone and thigh muscle. When any of these components fails to move properly, it can cause your kneecap to rub up against your thigh bone. This abnormal rubbing can lead to deterioration in the patella, resulting in chondromalacia patellae, or runner’s knee.
Improper kneecap movement may result from:
poor alignment due to a congenital condition
weak hamstrings and quadriceps (the muscles in the back and front of your thighs, respectively)
muscle imbalance between the adductors and abductors (the muscles on the outside and inside of your thighs)
repeated stress to your knee joints, such as from running, skiing, or jumping
a direct blow or trauma to your kneecap
Who is at risk for chondromalacia patellae?
There are a variety of factors that may increase your risk for developing chondromalacia patellae.
Age
Adolescents and young adults are at high risk for this condition. During growth spurts, the muscles and bones develop rapidly, which may contribute to short-term muscle imbalances.
Sex
Females are more likely than males to develop runner’s knee, as they typically possess less muscle mass than males. This can cause abnormal knee positioning, as well as more lateral (side) pressure on the kneecap.
Flat feet
Having flat feet may place more stress on the knee joints than having higher arches would.
Previous injury
A prior injury to the kneecap, such as a dislocation, can increase your risk of developing runner’s knee.
High activity level
If you have a high activity level or engage in frequent exercises that place pressure on your knee joints, this can increase the risk for knee problems.
Arthritis
Runner’s knee can also be a symptom of arthritis, a condition causing inflammation to the joint and tissue. Inflammation can prevent the kneecap from functioning properly.