Responders to Platelet-Rich Plasma in Osteoarthritis: A Technical Analysis

Table 1

The Mishra and PAW classification.

(a) PAW classification system

(i) Platelet concentration	P1: ≤baseline
	P2: >baseline–750000/µl
	P3: >750000–1250000/µl
	P4: >1250000/µl
(ii) X	Exogenous activation
(iii) White blood cells	(i) Total WBCs
	A: above baseline
	B: ≤baseline
	(ii) Neutrophils:
	A: above baseline
	B: ≤baseline

(b) Mishra classification

	WBC	Activation?	Platelet concentration
Type 1	Increased	No	A: ≥5x
			B: <5x
Type 2	Increased	Yes	A: ≥5x
			B: <5x
Type 3	Minimal or no WBCs	No	A: ≥5x
			B: <5x
Type 4	Minimal or no WBCs	Yes	A: ≥5x
			B: <5x