A statement from Wickens' Schmidt Peterson Motorsports team said the Canadian driver had surgery to stabilise his spine at Lehigh Valley Hospital in Pennsylvania on Monday.
The collision came as they exited turn two and caused Hunter-Reay's car to careen into the wall, and Wickens' car was pulled along with it.
The Spaniard is revered as a master of his metier, but his reservoir of patience with an underperforming car has finally hit empty.
Ducati's Lorenzo and Marquez, on a Honda, traded first place over the closing laps before Lorenzo powered past on the home straight and then held off Marquez on the next corner to pull away to win.
Italian Rossi (Yamaha) remained 11th with only the ten fastest in free practice receiving a direct pass to Q2.
The Indian outfit, based in Silverstone, England, was placed into administration last month, but said its future had been secured by the consortium.
Dovizioso had the Spaniard 0.178sec behind him at the line with defending world champion and series leader Marc Marquez (Honda) third at 0.368.
Renault followed a little later by tweeting: "We are delighted to announce that @danielricciardo will join @RenaultSportF1 as race driver from 2019."
He plans to fine-tune his physical and mental fitness in readiness to turn up the heat in his closely-fought title duel with Sebastian Vettel next month.
His exit came on the sixth lap and only a week after another power failure had ended team-mate Daniel Ricciardo's race at the German Grand Prix.
The defending world champion came home 17.123 seconds ahead of title rival and fellow four-time champion Sebastian Vettel of Ferrari.
Victory on Sunday will give the 30-year-old his second win of the season.
"Whatever happens, like everybody else, 'Checo' (Perez) is entitled to be paid."
The championship leading Briton, who is battling with Ferrari’s Sebastian Vettel for a fifth drivers’ world title, delivered another master-class in wet-weather driving and perfect timing.
The Ferrari driver, who crashed out of last weekend’s German Grand Prix while leading, clocked a best lap of one minute and 16.170 seconds.