Table III.

Platelet-rich plasma quality, cellular and growth factor correlations with Achilles Tendon Rupture Score at two years.

Parameter	n	r	% variance*	p-value†
Cell count
Red blood cell count	77	0.011	0.011	0.927
White blood cell count	77	< 0.001	< 0.001	0.996
Platelet count‡	74	0.065	0.419	0.584
Platelet quality
Activated CD62p expression (%)	77	-0.119	1.411	0.303
Mean fluorescence intensity	77	0.025	0.065	0.826
Growth factor
IGF-1	78	0.059	0.347	0.608
TGF-β1	75	0.0672	0.452	0.567
PDGF-AB	76	-0.076	0.580	0.513
VEGF	78	-0.165	2.706	0.150
FGFb	78	0.041	1.168	0.722

^*Proportion of variance in Achilles Tendon Rupture Score at two years explained by key blood parameter, calculated as: ((r × r) × 100).

^†Pearson’s correlation.

^‡As PLT-F (the Fluorescent Platelet Count on the Sysmex XN analyser).

FGFb, basic fibroblast growth factor; IGF-1, insulin-like growth factor-1; PDGF-AB, platelet-derived growth factor AB; TGF-β, transforming growth factor-beta; VEGF, vascular endothelial growth factor.