Knee Arthritis & Stem Cell Treatment in Miami

They can help some patients, but being told your knee is “bone-on-bone” does not, by itself, tell us whether stem cell therapy is likely to be successful or unsuccessful.

Advanced knee arthritis can still respond in some patients, but that does not mean every bone-on-bone knee should be treated. Stem cell therapy cannot completely reverse advanced disease or rebuild a severely damaged cartilage surface. The more important question is what is driving the pain, how much of the problem is structural or mechanical, and whether the knee can still be managed successfully.

The knee is more than the cartilage seen on an X-ray or MRI. Pain may also come from the meniscus, ligaments, tendons or other structures around the joint, and those findings can change both the target and the treatment plan. That is why we evaluate the entire knee, not just whether an imaging report says “bone-on-bone.”

Do We Need to Treat the Bone Beneath the Cartilage?

Sometimes arthritis affects the subchondral bone—the bone just beneath the cartilage. An MRI may show a change there, sometimes described as a bone marrow lesion or edema-like change. That finding alone does not mean the bone needs treatment. Dr. Karli reviews its location and appearance, then asks whether it fits your pain and the rest of what is happening in your knee. If treating the bone is appropriate, he may discuss an intraosseous injection in our in-office operating room, using fluoroscopic X-ray guidance and conscious (twilight) sedation. Conscious sedation is also available for other knee injections if you prefer it. Dr. Karli will discuss the options thoroughly with you and explain which approach makes the most sense for your long-term outcome.

Does Bone-on-Bone Mean I Need a Knee Replacement?

No. Being told your knee is “bone-on-bone” does not automatically mean you need a knee replacement.

“Bone-on-bone” describes advanced cartilage loss and often narrowing of the joint space seen on imaging, but imaging is only one part of the decision. We also look at what is actually causing the pain, how well the knee still functions, whether there is mechanical restriction or instability, what other structures may be involved, what treatments have already been tried and what the patient hopes to achieve.

Being told you are a candidate for knee replacement is one way to approach advanced arthritis. For some patients, knee replacement is not the only reasonable next step. Cell therapy may be worth evaluating first when the goal is to manage pain, preserve function and avoid moving too quickly to an irreversible surgery.

The field continues to evolve and outcomes data continues to grow. We cannot completely reverse advanced arthritis or rebuild a severely damaged cartilage surface, but we can often manage the disease very well and for sustained periods of time (often years) when the source of pain is accurately diagnosed and the patient is appropriately selected.

From Dr. Karli: “I’ve treated thousands of knees over more than 20 years in regenerative medicine, and some of the knees I expected to respond poorly have surprised me, with patients maintaining pain relief and function for years. There are limitations to both cell therapy and knee replacement. Our job is to help you understand those tradeoffs and decide which path makes the most sense for you.”

When Is Knee Arthritis Too Advanced for Stem Cell Therapy?

There is no single X-ray grade, including “bone-on-bone,” that automatically makes a knee too advanced for stem cell therapy. But there is a point where the structural or mechanical problem can outweigh what a cell-based treatment can reasonably manage.

We have treated advanced knees that responded better than expected, which is why we do not make this decision from imaging alone. At the same time, there are limits. Significant deformity, instability, severe loss of motion or a joint that is mechanically failing may make meaningful improvement less likely and may make surgery the more appropriate option.

Stem cell therapy cannot fully rebuild a knee that has lost its structural integrity. The goal is to manage pain and preserve or improve function when there is still a reasonable likelihood of doing so. That requires accurately diagnosing the source of pain, understanding the mechanical limitations of the knee and being honest about what treatment can and cannot accomplish.

From Dr. Karli: “If I believe your likelihood of success is low, I will tell you that. Some patients still choose to proceed because they want to know they explored every reasonable option before an irreversible surgery. For them, even a year of meaningful pain relief or improved function may be worthwhile. Cost, expectations and the likelihood of benefit all matter, and our job is to counsel you fairly so you can make an informed decision.”