Cartilage deterioration begins subtly in your 30s, with roughly 15% of healthy people showing defects, increasing significantly to around 60% by age 60, though symptoms like osteoarthritis often become noticeable after 50, resulting from slow, cumulative wear and cell changes (senescence) that reduce repair capacity, making joints stiffer and more prone to pain over time.
Sometimes cartilage damage occurs as part of degeneration, called osteoarthritis, which is the overall loss of tissue quality that occurs with aging. Cartilage damage is most frequently seen between the ages of 15 and 30 or above the age of 50.
Cartilage (hyaline cartilage or articular cartilage) is a 3-5 mm thin tissue that coats the boney surfaces inside our joints. It provides a very low friction articulation that ideally lasts a lifetime.
Pain, stiffness, swelling, and loss of range of motion in the joint are symptoms of articular cartilage damage. Healthy articular cartilage allows a joint to move easily and reduces friction between bones.
Cartilage Regeneration Options
MACI is a surgical procedure that uses cartilage-forming cells from your body to restore damaged cartilage in the knees. It involves a biopsy to harvest chondrocytes (cartilage-forming cells), which are allowed to multiply in a lab, and surgery to implant them into the damaged area.
Vitamin D has been associated with cartilage regeneration in OA, but the exact mechanism is not well defined. Vitamin D deficiency is associated with an increased risk of patients developing OA in some studies, but the results of other studies have been inconsistent.
These findings indicate that joint activities such as walking may play a key role in maintaining and recovering cartilage strain, with implications for maintaining cartilage health and preventing or delaying cartilage degeneration.
Cycling both indoors and outdoors is beneficial for your condition as it keeps your knee joints moving without putting too much pressure on them. Cycling is a great exercise to condition the knee joints, to ultimately help reduce stiffness and increase your muscle strength, which boosts your mobility.
Through the ability of magnetic resonance imaging (MRI) to characterize soft tissue noninvasively, it has become an excellent method for evaluating cartilage. The development of new and faster methods allowed increased resolution and contrast in evaluating chondral structure, with greater diagnostic accuracy.
How to Naturally Increase Cartilage in Your Joints
Stretch every day and warm up before you exercise
Be sure to perform simple joint stretches every day. This helps ward off stiff joints and protects your cartilage. Always warm up before you exercise. Without warming up, you could tear cartilage that has thinned.
Gout is an extremely painful type of arthritis caused by a buildup, overflow and/or inability to process uric acid.
Glucosamine (G) 1,500 to 2,000 mg/d and chondroitin sulfate (Cs) 800 to 1,200 mg/d and avocado-soy unsaponifiables (ASU) 300 to 600 mg/d, taken together or alone, are useful as adjunct therapies in cartilage disorders. Each is sold as prescription, over the counter (OTC), or as supplements, depending upon the country.
Controlled, repetitive low-impact loading exercises stimulate cartilage repair and strengthening. Recommended exercises include cycling, elliptical training, rowing, and moderate walking. Avoid high-impact activities like running and jumping that can damage cartilage.
Weak legs are a common problem in seniors because we lose muscle mass as we get older. As we age, we tend to become less active, and this causes a reduction in our muscle strength. While some physical conditions can cause leg weakness, chances are, your weak leg muscles are part of the aging process.
Our estimates suggest that diagnosis of symptomatic knee OA occurs early in the life course (median age 55 years), with incidence peaking between ages 55 and 64. Early diagnosis of symptomatic knee OA may yield future increases in health care utilization and medical costs associated with knee OA.
What are symptoms of cartilage damage in the knee?
Cartilages take many forms, but all are characterized by the presence of fibrous collagens embedded in a highly hydrated extracellular matrix containing typically 60–80% water.
Imaging Tests
Your doctor may order an X-ray to create images of the knee bones and to rule out other causes of your symptoms, such as fractures or degenerative osteoarthritis. An MRI, which creates images of soft tissues, helps your doctor determine whether you have an acute injury to the knee cartilage.
The 75% rule in cycling training means that 75% of your total riding time should be spent at an easy, aerobic pace (below 75% of your maximum heart rate or FTP), with only 25% dedicated to high-intensity efforts (Zones 4-5), to build endurance without overtraining. This approach, often called polarized training, emphasizes building a strong aerobic base through Zone 1/2 riding, preventing burnout, and ensuring high-quality, effective hard sessions, leading to better power and endurance gains.
The #1 mistake making bad knees worse is excessive rest and a sedentary lifestyle, leading to weaker supporting muscles, stiffness, and a vicious cycle of more pain; instead, gentle, consistent movement (like walking, swimming) is crucial to strengthen the joint and improve function, though it must be balanced with avoiding activities that cause sharp pain. Other major errors include ignoring pain signals, carrying excess weight, wearing unsupportive shoes, and poor movement patterns, says Parkside Sports Physiotherapy and Coastal Empire Orthopedics.
For patients with knee osteoarthritis, aerobic activities such as walking, cycling, or swimming are likely to be the best exercise for improving pain, function, gait performance, and quality of life, finds a study published by The BMJ today.
Oranges are an obvious choice in terms of getting vitamin C to promote the building of collagen as well as to promote cellular healing, which by extension is helpful in cartilage regeneration and protection. Vitamin C is also found in abundant quantities in other foods like kiwis, red peppers, kale, and strawberries.
Some people worry that exercising could make their arthritis worse. But the truth is being active is good for us and helps keep our joints healthy. “All the evidence suggests that exercising helps to strengthen your joints, maintain flexibility and improve your general health,” explains David.
As of 2025, PRP has moved beyond being an experimental therapy. It is now recognized as one of the leading biologic options for knee osteoarthritis. Ongoing studies are exploring how PRP can be combined with stem cell therapy or other regenerative techniques to further enhance outcomes.