A surgeon who has spent decades repairing the knees of Olympic athletes and NFL players walks into his clinic every morning with a quiet reminder of his own fragility. At 16, a brutal hit on a football field shattered his kneecap and tore his medial collateral ligament (MCL). That knee has never fully healed—and Dr. Nicholas DiNubile has spent 40 years making sure it never slows him down.
For DiNubile, this fight against knee deterioration is both professional and personal.
In a recent episode of “Vital Signs” from The Epoch Times, he shared decades of hard-won wisdom, not from a position of clinical detachment, but as someone who has lived with the problem he treats every day.
As a teenager playing football, he was clipped, tearing his MCL and suffering a severe fracture-dislocation of his patella (kneecap). Back then, the standard treatment was three months in a cast, a decision he now recognizes as deeply counterproductive.
“That was probably the worst thing you could ever do,” he recalled, “because keeping things still—unless you absolutely have to—is not good for your joints.”
The prolonged immobilization weakened the surrounding muscles and accelerated joint damage, causing his kneecap to develop arthritis far earlier than it otherwise might have. Decades later, even as one of the country’s leading knee specialists, he recognizes the limits of surgery for his particular injury. “If it’s just the kneecap that’s arthritic, it’s hard to fix that with surgery,” he said. “So I had to always work on other ways to work around it.”
That personal battle shaped his entire career philosophy—one built on smart movement, minimally invasive innovation, and a deep respect for the joint’s delicate balance. “Early in my career, I stopped doing joint replacements,” he said. “My goal was to save people’s knees: Number one, through prevention; number two, through amelioration.”
Shed Pounds, Build Strength
In the United States, knee pain and osteoarthritis rank among the top reasons people see a doctor. Aging, old injuries, excess weight, and daily wear slowly destroy protective cartilage, bringing stiffness, pain, and a frustrating loss of mobility.
Of all the variables a patient can control, DiNubile said one stands above the rest. “What’s the best advice for preventing knee problems? I would say keeping your weight down,” he said.
Excess weight affects knees in two ways—through direct mechanical overload and by fueling body-wide inflammation that worsens joint degeneration. “Every pound you carry, the knee thinks is four or five pounds,” DiNubile said. That amplified force wears down cartilage faster and speeds arthritis progression, while the inflammatory effects of obesity compound the damage from within. “The inflammatory side of obesity that creates inflammation throughout your body is not good if you’re already developing some arthritis,” he added.
Weight control is essential, but building strong leg muscles is often the more transformative pillar. As people age or become inactive, these muscles weaken, leaving the knees vulnerable. “Trying to keep your quadriceps and all your leg muscles strong is important,” DiNubile emphasized. “Your core, your quads, your calves, your hamstrings—they protect the knee. They’re your shock absorbers.”
A Case for Three-Dimensional Fitness
Staying active through sports is one of the best ways to lubricate joints, maintain joint function, and reduce the risk of arthritis—but not all movement is equal. DiNubile draws a sharp distinction between linear gym routines and what he calls three-dimensional fitness, or “3D Fit”: the kind of multidirectional agility, quick reaction, and adaptability that real life actually demands.
As editor-in-chief of “The Physician and Sportsmedicine,” DiNubile made this case in his editorial “Are You 3D Fit?”—arguing that treadmills and stationary bikes, while valuable, train the body in only one plane of movement. “Till I went to three-dimensional stuff again, I didn’t realize how much I lost, but I got it back.”
Tennis blends aerobic endurance with high-intensity intervals, sprints, stops, and explosive changes of direction, and constant spatial problem-solving. Studies show that recreational players may have better musculoskeletal and lower-extremity function, sharper coordination, better balance for fall prevention, and enhanced proprioception—“your body’s internal GPS system.”
The benefits extend beyond the physical. The mental and social benefits round it out: Strategy keeps the brain sharp, while play fosters friendships and combats loneliness—“as bad as being sedentary with aging,” DiNubile said. “You make new friends, and you do a lot with these friends.”
The sport can also adapt as the body changes. Even with knee limitations, tennis still offers ways to stay in the game. “I can’t play much singles anymore because I’ve got a bum knee,” he said, “But doubles lets you stay in the game.” In one activity, tennis covers physical, cognitive, and social bases—“all the bases for giving you what you want in life.”
Why Young Women Are at Particular Risk
A major concern in sports medicine is the high rate of anterior cruciate ligament (ACL) tears among young female athletes—and the long shadow those injuries cast. “When you tear your ACL, if you think a meniscus is bad, tearing your ACL is your guarantee. Even if you get good surgery and repair the ACL, you’re guaranteed 10 to 20 years later to have arthritis in that knee—even if it’s repaired,” DiNubile warned.
Joint Supplements: Protecting What Remains
For people showing early signs of knee arthritis, acceptance is key: The joint may require a different approach to stay active long-term. While remaining fit and engaged is entirely possible, high-impact activities should be minimized to avoid accelerating wear and tear.
He also recommends other cartilage-protective compounds, such as boswellia, green tea extract, and avocado-soy compounds, which are found in some of the better joint supplements. “I don’t think it’s going to regrow any cushions (cartilage) … but it can protect and stabilize the situation,” DiNubile said.
What supplements cannot do, however, is reverse structural damage. “You can’t take something in your mouth or get a shot and regrow your joint,” DiNubile said.
When Surgery Becomes Necessary
True cartilage repair is limited to specialized procedures.
When arthritis progresses to bone-on-bone contact, joint replacement is the standard of care. It relieves pain and restores function. “It’s still a great procedure. It keeps people active and gets you back to a lot of things—even if distance running isn’t on the menu,” DiNubile said. That said, it remains, in his view, a last resort rather than a first response.
Minimally invasive approaches, such as knee arthroscopy, allow surgeons to perform targeted repairs of meniscal and cartilage injuries through small incisions, preserving joint integrity.
The Mind’s Powerful Role in Healing
Of everything DiNubile has observed across decades of practice, one factor continues to separate patients who undergo identical procedures but have dramatically different outcomes: mindset.
“The mind really affects how you feel, how you heal, and you can make it work for you or against you,” DiNubile said.
Ten patients with identical procedures can have dramatically different recoveries. Elite athletes often heal faster because of their discipline and positive outlook. People with chronic pain, by contrast, may make limited progress despite successful surgeries if psychological factors are ignored.
DiNubile urges collaboration with mental health professionals as part of the rehabilitation plan, not as an optional extra. Healing is mechanical—but a strong, positive mind can be a powerful ally.
By combining weight control, smart movement through activities like tennis, targeted supplements, timely interventions, and the right mindset, you can prevent, ease, or even slow knee arthritis—and keep your knees thriving for life.
