Introduction: PRP in Knee Osteoarthritis Research
Interest in platelet-rich plasma (PRP) preparation continues to grow in musculoskeletal medicine.
In particular, researchers are studying PRP preparation systems in patients with knee osteoarthritis.
Recently, investigators at Fondazione Policlinico Universitario Agostino Gemelli IRCCS in Rome, Italy, published research evaluating a neutrophil-depleted PRP preparation.
This study adds to the expanding body of literature on platelet-rich plasma preparation in knee osteoarthritis.
What Is Platelet-Rich Plasma (PRP)?
Platelet-rich plasma is an autologous biologic preparation derived from a patient’s own blood.
Clinicians produce PRP using a PRP preparation system.
First, they collect a blood sample. Next, they process the sample using centrifugation. Then, the system separates blood into layers:
• red blood cells
• platelet-poor plasma
• platelet-rich plasma
The platelet-rich fraction contains concentrated platelets and signaling proteins. Therefore, researchers continue to study platelet-rich plasma preparation in regenerative medicine.
Overview of the Study
The study is titled:
“High Dose Neutrophil-Depleted Platelet-Rich Plasma Therapy for Knee Osteoarthritis: A Retrospective Study.”
In this analysis, investigators reviewed clinical records from 212 patients diagnosed with Kellgren-Lawrence grade 1–3 knee osteoarthritis.
Study design highlights:
• retrospective review of patient records
• PRP prepared using a neutrophil-depleted protocol
• three injections administered per patient
• follow-up period of approximately 12 months
During follow-up, investigators tracked changes in patient-reported outcome measures.
According to the authors, many patients showed measurable changes in these scores over time.
However, as with many PRP studies, the authors emphasized the need for:
• prospective clinical trials
• standardized PRP preparation methods
• consistent reporting of platelet concentration
Why PRP Preparation Systems Matter
One key focus in PRP research is how platelet-rich plasma is prepared.
Different PRP preparation systems can produce samples with varying characteristics.
Important variables include:
• platelet concentration levels
• leukocyte (white blood cell) content
• red blood cell (RBC) presence
• platelet-derived protein profiles
Because of this variability, researchers often stress the importance of standardized platelet-rich plasma preparation.
PRP Preparation Systems in Clinical Research
PRP preparation systems, including systems such as Tropocells®, are designed to process whole blood using centrifugation and separation technology.
These systems aim to:
• isolate platelet-rich plasma
• reduce red blood cell contamination
• support consistent preparation workflows
However, systems may differ in:
• centrifugation protocols
• platelet recovery rates
• leukocyte profiles
• workflow design
As a result, comparative studies play an important role in evaluating PRP preparation system performance.
Ongoing Research in Orthobiologics
Research in orthobiologics continues to expand.
Investigators are actively studying:
• platelet-rich plasma preparation methods
• platelet concentration variability
• leukocyte-reduced PRP formulations
• standardization of preparation protocols
These efforts aim to improve understanding of how PRP preparation systems influence biologic composition.
Access the Study
You can access the full study here:
➡ High Dose Neutrophil-Depleted Platelet-Rich Plasma Therapy for Knee Osteoarthritis: A Retrospective Study
Preprints.org
Conclusion
Platelet-rich plasma preparation remains an important area of research in knee osteoarthritis.
While this study provides additional insight into neutrophil-depleted PRP preparation, results must be interpreted carefully.
Because PRP preparation systems vary, clinicians should evaluate:
• system design
• preparation protocols
• current scientific evidence
As research continues, standardized methods may help clarify the role of platelet-rich plasma preparation in musculoskeletal medicine.
Regulatory Notice
Tropocells® systems are intended for the preparation of autologous platelet-rich plasma.
The clinical use of PRP is determined by the treating physician based on patient evaluation and professional judgment.
Statements regarding PRP reflect published scientific literature and are not intended to imply FDA-cleared indications for specific clinical outcomes.
Reference
High Dose Neutrophil-Depleted Platelet-Rich Plasma Therapy for Knee Osteoarthritis: A Retrospective Study
Preprints.org