DECISION ORDER
ORDERED that the appeal from the order dated October 29, 1998, is dismissed, as that order was superseded by the order dated March 23, 1999, made upon reargument; and it is further,
ORDERED that the order dated March 23, 1999, is affirmed insofar as appealed from; and it is further,
ORDERED that the respondent is awarded one bill of costs.
The court providently exercised its discretion in denying the plaintiffs' motion to restore the case to the trial calendar. A plaintiff who seeks to restore a case to the trial calendar within a year following its being stricken therefrom must show, inter alia, the existence of a meritorious cause of action and a sufficient reason for the delay (see, Lupoli v. Venus Labs., 264 A.D.2d 820; Evans v. Kringstein, 225 A.D.2d 582; Barton v. Jablon, 181 A.D.2d 755). The conclusory affidavit of the plaintiffs' medical expert was insufficient to establish the merits of the action (see, Evans v. Kringstein, supra; Iazzetta v. Vicenzi, 243 A.D.2d 540; Barton v. Jablon, supra), and the plaintiffs failed to satisfactorily explain the delay.