An orthobiologic is prepared from your own tissue: blood, bone marrow, or fat is collected, processed under a defined protocol, and injected at a chosen anatomical target. Processing standards matter because every one of those steps — how the sample is drawn, how long it sits, how it is spun, how it is labeled and handled — changes what actually ends up in the syringe. Two patients can both be told they received “PRP” and receive materially different preparations delivered to different targets.
That gap between the word and the material is not hypothetical. In a cross-sectional survey of 357 adult patients at a single orthopaedic clinic in Chicago, conducted between October 2023 and April 2024, only 44.0% were familiar with orthobiologics at all, and 66.9% of the full cohort believed orthobiologics could treat cartilage injuries.
Key points
- “Orthobiologic” is a category, not a product. Platelet-rich plasma, bone marrow aspirate concentrate, and micro-fragmented adipose are prepared differently and behave differently.
- The delivery route is part of the preparation. Intra-articular, intraosseous or subchondral, tendon, and intradiscal targets are different clinical decisions, not different names for one injection.
- Consistency is the point of a protocol. Standardized collection, timing, sterile handling, and labeling are what make a series of treatments comparable to one another.
- Patient expectations are frequently wrong. Two thirds of surveyed patients believed orthobiologics treat cartilage injuries, which is why the preparation conversation has to happen before consent, not after.
Why “orthobiologics” is not one thing
Orthobiologics is an umbrella term covering preparations made from a patient’s own blood, marrow, or adipose tissue. Under that umbrella sit intra-articular and tendon platelet-rich plasma in leukocyte-poor and leukocyte-rich variants, intraosseous and subchondral PRP, bone marrow aspirate concentrate, micro-fragmented adipose, and intradiscal preparations.
Because they start from different tissues and follow different handling paths, they are not interchangeable. The question worth asking a clinic is never “do you offer orthobiologics” but “which preparation, prepared how, delivered where, and why that one for me.”
Regen.MD describes each of these categories, and the reasoning behind choosing between them, on our orthobiologics service page.
The preparation steps a clinic should be able to explain to you
Informed consent for an autologous preparation depends on your understanding what is being made from your own tissue. Each of the following is a step you can reasonably ask about before you agree to anything.
Collection and identification
Every autologous preparation starts with a collection: a venous draw for PRP, a marrow aspiration for BMAC, a small lipoaspirate for micro-fragmented adipose. Chain of identity from the moment of collection through to injection is the baseline safety requirement, because the material is specific to one patient and cannot be replaced.
Controlled processing and timing
After collection the sample is processed under a defined protocol: fixed centrifuge parameters, fixed intervals between steps, fixed volumes. Timing is not a formality. A sample that waits, or that is spun differently, yields a different final preparation, and that variation is what a protocol exists to suppress.
Sterility, handling, and quality assurance
Because an autologous preparation is opened, processed, and re-injected, sterile technique and closed handling are central to infection risk reduction. A clinic should be able to describe its handling practice and what it documents about each preparation.
Delivery route and target
The injection target is a preparation decision as much as a procedural one. Intraosseous and subchondral PRP place the preparation into bone-adjacent tissue rather than the joint space; tendon and intradiscal targets are different again. A protocol aimed at a precise target has to be consistent about what reaches it.
What preparation standards cannot deliver
Clear processing is a necessary condition for a sound plan, not a sufficient one, and it does not change what these preparations are capable of. No orthobiologic has been shown to regrow or regenerate articular cartilage, and any clinic implying otherwise has moved past what the evidence supports.
For advanced knee osteoarthritis in particular, PRP is appropriately framed the way trial authors have framed it: a safe bridge therapy before arthroplasty, aimed at pain and function while the decision about surgery is made. That framing does not become more ambitious because the preparation was careful.
This is exactly where the survey finding bites. If two thirds of patients arrive believing orthobiologics treat cartilage injuries, an accurate account of the preparation is the first opportunity to correct the expectation.
How preparation fits into the clinical reasoning
Preparation standards are downstream of a diagnosis. Before any injection is planned, the relevant questions are why the tissue is failing, what systemic and metabolic factors are contributing, and whether an injection addresses any of them.
At Regen.MD, that review happens first: history, imaging, and metabolic data are read by a physician, and the output is a written roadmap rather than a procedure booking. You can read how the sequence is structured in our evaluation pathway.
The practical consequence is that a well-prepared biologic injected into a poorly characterized problem is still a poorly reasoned plan. Preparation quality and clinical reasoning are separate requirements, and both have to hold.
Questions worth asking any clinic offering orthobiologics
- Which specific preparation are you proposing, and from which of my tissues?
- What is your processing protocol, and what is held constant between patients?
- What is the injection target, and what imaging guidance is used to reach it?
- What is this intended to achieve, over what period, and what would tell us it has not worked?
- What happens next if it does not work?
A clinic that answers those five plainly is describing a plan. One that answers them with category language is describing a sale.
What this practice actually uses
The formulation questions above are not left open here. Regen.MD prepares platelet-rich plasma leukocyte-poor — no white blood cells and no red blood cells — activated with calcium chloride, at a platelet concentration of two to three times baseline, with higher dosing in the six to twelve times range.
The target is a measured dose of more than ten billion platelets delivered per joint. Measured rather than assumed: platelet yield varies between patients and between draws, which is why a protocol expressed only as a multiple of baseline can deliver very different absolute doses to two people on the same day. That is the practice’s specification, not a finding from any single trial.
Frequently asked questions
Why does processing matter if the material comes from my own body?
Autologous does not mean uniform. Variability comes from your biology and from handling, so collection technique, centrifuge parameters, timing, and sterile practice all shape what is finally injected, and a fixed protocol is what makes one treatment comparable to the next. The preparations Regen.MD works with are described on our orthobiologics service page.
What is the difference between intraosseous and intra-articular PRP?
Intra-articular PRP is placed in the joint space; intraosseous or subchondral PRP is placed into bone-adjacent tissue beneath the joint surface, which is a different target requiring image guidance. Which target is appropriate depends on your imaging and symptom pattern, assessed during our evaluation pathway.
Can a carefully prepared orthobiologic rebuild my cartilage?
No. No orthobiologic has been shown to regrow or regenerate articular cartilage, and processing quality does not change that; for advanced knee osteoarthritis, PRP is framed as a bridge therapy before joint replacement. The conditions evaluated on that basis are listed under the conditions we evaluate.
What is BMAC, and how is it prepared differently from PRP?
Bone marrow aspirate concentrate starts from a marrow aspiration rather than a venous draw, and is then concentrated under a defined protocol, so the collection step itself is a procedure with its own technique and handling requirements. Background reading on these categories is collected in the Regen.MD library.
Are peptides part of an orthobiologic preparation?
No. Peptides are a separate subject discussed clinically and educationally at Regen.MD, and they are not sold as a product or bundled into an injection plan. What that discussion covers is described on our peptide therapy page.
Find out what is actually driving your joint pain
Regen.MD begins with a physician-led Clinical Evaluation — a review of your history, imaging, and metabolic data, and a written terrain roadmap. Evaluation is contingent upon review of your data.
Questions? Call (314) 295-3000 or text (314) 886-5902.
Sources
- Garcia JR, Pallone LV, Gilat R, et al. What Do Patients Know About Orthobiologics? Perceived Efficacy, Safety, and Factors Influencing Treatment Decisions. Orthopaedic Journal of Sports Medicine. 2026;14(2). https://pubmed.ncbi.nlm.nih.gov/41743451/ (Referenced for: cross-sectional single-center survey of 357 analyzed adult patients at an orthopaedic clinic in Chicago, October 2023 to April 2024; 44.0% familiarity with orthobiologics; 66.9% of the cohort believing orthobiologics could treat cartilage injuries.)
- Regen.MD. Orthobiologics. 2026. https://regen.md/services/orthobiologics/ (Referenced for: the orthobiologic preparations offered by this practice — intra-articular and tendon PRP, intraosseous and subchondral PRP, bone marrow aspirate concentrate, micro-fragmented adipose, and intradiscal orthobiologics.)