No fluff. No fads. Deep-dive investigative reports from the surgeon who actually sees the inside of the joints.
If a clinic is selling you an injection without first doing standing X-rays and a careful exam, they are selling — not treating. The difference between “helped a lot” and “did nothing” is usually about which injection met which knee.
Hyaluronic acid (HA) is a natural component of synovial fluid — the slippery liquid inside every joint. In arthritis, the native HA becomes shorter and thinner, and joint fluid loses its shock-absorbing elasticity. Injectable HA products replace or supplement that molecule with a higher-molecular-weight version, typically over a series of one to three injections.
Platelet-rich plasma (PRP) is your own blood, centrifuged down to a high-concentration platelet layer that is re-injected into the joint. Platelets release dozens of growth factors — the idea is that these stimulate chondrocyte metabolism and quiet inflammatory cytokines.
PRP is not a single product. The difference between a quality preparation and a budget one is an order of magnitude of platelet concentration — and that is what the research is measuring.
Dr. Sameh Elguizaoui, M.D. — Board-Certified Orthopedic SurgeonWe wrote a full deep dive on PRP earlier in this series — see the PRP decoded article for the preparation details. The short version: leukocyte-poor, double-spin PRP with > 5× platelet concentration has the best evidence.
Multiple randomized trials now compare HA and PRP head-to-head for knee osteoarthritis. The consistent finding: in early-to-mid-stage disease, PRP outperforms HA at 6 and 12 months for pain and function, but not by a huge margin. In advanced, bone-on-bone disease, neither performs particularly well — and surgery becomes the honest recommendation.
Lubrication
Biologic
Cortisone is a short-term anti-inflammatory. It works quickly but can damage cartilage with repeated injection. We use it sparingly and avoid it in early arthritis when we plan to offer biologics.
Not simultaneously. Mixing preparations complicates the biology. We typically pick one, assess response at 3 months, and switch only if warranted.
For orthopedic use, almost never. HA is covered by most insurers for knee OA. PRP is typically out-of-pocket, which is part of why we advise it only when the evidence says it will help.
The data remain mixed and the regulatory landscape is a concern. Read our stem cell investigation before paying five figures for an unregulated injection.
HA can be repeated every 6 months. PRP typically holds for 9–12 months and can be repeated annually if it helped.
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Take the first step toward recovery. Schedule a consultation with Dr. Elguizaoui to discuss your condition and explore your treatment options.