Table 1.

Ongoing clinical trial registered on ClinicalTrials.gov from 29 December 2022 comparing leukocyte-rich vs. leukocyte-poor Platelet-rich Plasma for treatment of knee osteoarthritis.

Study Identifier	Biologic (Description)	Study Phase; Estimated Enrollment (N)	Primary Outcome Measure(s)	Recruitment Status	Country
NCT04187183	Fresh PRP with concentrated leukocytes vs. Fresh PRP without concentrated leukocytes	Not applicable; N = 132	IKDC-subjective score (International Knee Documentation Committee) (Time Frame: 12 months). As a specific subjective rating scale for the knee, this scoring system is one of the most reliable tools for assessing knee diseases. The survey examines three categories: symptoms, sport activity and knee function.	Recruiting	Italy