Most people hear two options for a worn-out knee: live with it, or replace the whole joint. On Episode 7 of our Pain 2 Power radio show, Dr. Dave Kashuba and Mike McGann sat down with Dr. Rami Elkhechen, M.D., a fellowship-trained sports medicine orthopedic surgeon now with NYU Langone Health, to talk about a third path. The goal there is to rebuild the cartilage you were born with rather than swap the joint for metal and plastic.
It's a narrower path than the other two, and it only suits certain knees. But if yours is one of them, you should know about it before anyone hands you a surgery date, and know how much of the result depends on the months of rehab that follow.
By The First Rehabilitation Team · Reviewed by Dr. Dave Kashuba, Ph.D.
Why cartilage is the part to protect
Dr. Elkhechen trained at NYU School of Medicine, did his sports medicine fellowship at the Ochsner Sports Medicine Institute in New Orleans, and spent time as an assistant team physician for the Saints and the Pelicans. Cartilage preservation is one of his focus areas, and he uses an analogy that sticks. Cartilage, he says, is "the gold in a vault at a bank." The ligaments, tendons, and meniscus around it are the security system, the guards and the alarm. They matter enormously, but they exist to protect the gold. "Once the cartilage is gone," he explained, "the supporting structures become secondary."
Dave raised the problem directly on the show: cartilage has no nerve endings. You can wear it down for years without feeling a thing, which is why so many people don't arrive until the problem is already advanced. As Dave put it, by the time someone shows up with pain, the trouble has often reached the bone underneath.
So the joint surface you most want to protect is also the one that gives you the least warning. That's an odd setup. It's also the reason the rest of this post spends so much time on the indirect clues.
The signs to get checked
Because cartilage itself can't hurt, the early clues are indirect. Dr. Elkhechen pointed to two in particular. The first is swelling inside the joint, a build-up of fluid that seems to come from nowhere. You didn't fall, you didn't twist it, and yet the knee looks puffy after a morning on the tennis court. The second is simpler: you can't do your normal activity anymore. If you're active and something you enjoy has become off-limits, that's reason enough to have it looked at.
After a specific tweak or twist, his advice was measured. Give it a few days of rest, ice, and anti-inflammatories. If the pain settles, you likely don't need an office visit. If it lingers, that's when to come in.
His broader point was about timing. Get evaluated early, because even if there's nothing to do yet, it can be monitored so the window for treatment doesn't quietly close. That window is the whole game with cartilage, as the next section explains.
Who is a candidate for a cartilage transplant?
Before any of this, Dr. Elkhechen was emphatic about the order of operations. It starts with X-rays and a hands-on physical exam, often an MRI, and then non-operative treatment. "We tend to try non-operative treatment as often and as much as we can before we indicate any patients for any type of surgical management," he said, adding that conservative care is frequently successful on its own.
Small and contained, or worn all over?
The single biggest factor is the shape of the damage. Transplants are for small, focal areas of damage: a contained spot, with healthy cartilage around it. A contained lesion is far more treatable than widespread, end-stage arthritis.
That distinction is also how these three knee topics on our blog sort themselves out. If your knee is wearing generally, the right starting point is knee arthritis treatment before surgery, the conservative ladder an orthopedic surgeon described on Episode 6. If the wear has gone far enough that replacement is on the table, read partial vs total knee replacement before you choose. A transplant sits in its own lane: one defined spot, in a knee that is otherwise holding up.
Age, health, and insurance
Beyond the shape of the damage, candidates are generally people up to about age 55, sometimes 60 in good health, subject to insurance approval. Mike pointed out the difference: a knee replacement is a successful operation, but the joint always feels somewhat different afterward. A transplant aims to restore your own anatomy.
For a lot of active people around the Palm Beaches, the forty-something who runs along A1A before work or the fifty-something with a standing doubles game, that difference is the whole reason to ask.
How the two-stage transplant works
When a transplant is the right call, it happens in two stages, with a lab in between. Here's the sequence as Dr. Elkhechen laid it out.
| Step | What happens | Timing he gave |
|---|---|---|
| Workup | X-rays, a hands-on physical exam, often an MRI | Before anything else |
| Conservative care | Non-operative treatment, tried "as often and as much as we can" | Frequently successful on its own |
| Stage one | Outpatient scope with a small camera; if the damage fits, a "small Tic Tac sized" piece of cartilage is harvested from a part of the joint that doesn't need it | Can take around thirty minutes |
| The lab | Your own cells are grown on a scaffold | Roughly six weeks |
| Stage two | A more involved procedure implants the new cartilage into the damaged area | After the cells are ready |
| Recovery | Motion early; weight-bearing and impact held back | Depends on where the lesion is and how large |
Notice the six weeks in the middle. That gap is useful, because it's time you can spend getting stronger, which is where the prehab conversation further down comes in.
Cartilage transplant knee recovery: rehab decides the outcome
This is where the conversation came home for us. Surgery puts the new cells in place. What happens over the next few months decides whether they take.
Motion early
"Cartilage loves range of motion," Dr. Elkhechen said, and gentle motion begins almost immediately after surgery. That can surprise people who expect to be told to keep the leg still. Moving the joint carefully, within the limits your surgeon sets, is part of the treatment.
Weight held back, on purpose
Weight-bearing and high-impact activity are a different story. Those are held back deliberately so the new cells can take hold. Recovery timelines depend on where and how large the lesion is. Damage under the kneecap may allow weight-bearing almost right away with the knee held straight, while other areas typically take eight to twelve weeks to reach full weight-bearing.
That's a long time to be careful, and it's where people get into trouble. You feel fine at week five, the knee isn't sore, the weather is perfect, and the temptation to test it with a long walk on the beach is real. The cells don't know the weather is nice. Follow the protocol.
What therapy is doing in the meantime
The waiting period is spent on range of motion and on strengthening the muscles around the knee, the ones, in his words, "supporting that gold." That's exactly the post-surgical rehabilitation our physical therapy team does: we work from your surgeon's protocol, measure your range of motion as it comes back, and progress strength in step with what the tissue is allowed to do. When the surgeon clears more weight, the focus shifts to walking well again, which is what gait training means in plain English. You can read more about our approach on the knee pain page.
Prehab: getting strong before the operation
Dave asked about prehab, meaning rehabilitation before surgery, and Dr. Elkhechen does it routinely, especially with ACL patients, strengthening the quadriceps and hip abductors ahead of time. His reasoning applies well beyond one procedure: "The stronger your base is as you're coming in, in terms of strength and your activity level, you're probably going to come out the other side much better in terms of recovery."
For a transplant, the six-week lab window is a natural place for that work. Ask your surgeon whether prehab fits your plan, and if it does, bring us the details.
Knowing the why
He also said patients who understand their diagnosis and their therapy plan do better: "If they're not on board with treatment, that treatment is less likely to succeed." Knowing the what and the why changes results. It's why our therapists explain what they found at the first visit, and why we'd rather you ask the same question three times than nod along.
What you can do to protect your knees now
Asked what prevents this kind of damage in the first place, Dave pointed to the knee's stabilizers, particularly the vastus medialis (the VMO) on the inner knee, which helps track the kneecap. His guidance was to strengthen the whole quadriceps and work the muscles both above and below the joint, including the glutes and calves.
One exercise he shared on air: lie on your back with your knees comfortably bent and both feet flat on the floor or bed. Lift your hips upward, pause at the top, and squeeze the glute muscles, three sets of ten. Move gently, stay within a comfortable range, and stop if anything sharpens the pain.
That bridge sits at the end of the knee section in our home exercise library, next to the seated leg extensions that work the VMO. Dave pairs the two rather than doing either alone, because the knee is carried from above and below.
Start with an evaluation
Whether your knee needs surgery, prehab, or simply a smarter strengthening plan, the honest answer starts with someone looking at it. Our therapists evaluate your knee, tell you plainly whether therapy is likely to help, and coordinate with your physician or an orthopedic specialist when you need one. We see patients from North Palm Beach and up the coast through Tequesta.
Call First Rehabilitation of North Palm Beach at 561-624-4263, request an appointment online, or hear the full conversation on the Pain 2 Power podcast.
This article is general information, not medical advice. Every situation is different, so please consult a qualified professional about yours.