Table 1.

Recent publications using platelet-rich plasma

Authors	Type of study	Number of subjects	Amount of autologous blood	Hemoglobin decrease	Need for transfusion	Length of stay	Pain	ROM
Gardner et al. [8]	Retrospective	98	450 mL	+*	NA	+	+	+
Berghoff et al. [2]	Retrospective	137	55 mL	+	+	+	NS	+
Everts et al. [7]	Prospective	165	250 mL	+	+	+	+	NA
Horstmann et al. [10]	Randomized, prospective	40	128 mL	NS	NS	NS	+	NS

*+ =  significant (p < 0.05); NA = not available; NS = nonsignificant.