Platelet-rich plasma for muscle injuries: A systematic review of the basic science literature

Table 7 Variables reported – combined in vivo and in vitro muscle studies

Outcome	Studies reporting, n (%)	Significant increase, n	No significant change, n	Significant decrease, n
Cell viability	0 (0)	0	0	0
Cell proliferation	1(25)	1	1
Cell differentiation	1 (25)	1	0	0
Gene expression	3 (75)	3	0	2
Gross appearance of muscle repair	0 (0)	0	0	0
Histologic assessment of muscle repair	2 (50)	2	1	1
Proteoglycan content	0 (0)	0	0	0
Collagen deposition	0 (0)	0	0	0
Muscle strength	0 (0)	0	0	0
Inflammatory mediation	0 (0)	0	0	0