He won the opening stage time-trial on July 1 - his first ever Grand Tour stage victory - and took over the leader's yellow jersey.
But the savage stage that included seven categorised climbs, including the three steepest of the entire race, had taken its toll.
Fabio Baldato, one of the directors of Porte's BMC team, said the rider had shoulder pain but "was always conscious".
There was no getting up for Porte, who was placed in a neck brace, stretchered into an ambulance and straight to hospital - bloodied, bruised but still asking for his helmet and glasses.
But once again, as in Mark Cavendish's stage four horror crash, it's the riders that didn't cross the line who will dominate the headlines. "When I heard it on the radio then I stopped".
A very hard day on the mountains saw Froome need a bike change but recover to take a commanding lead in the Tour as Porte and Thomas crashed violently. "I only found out at the finish". Now, it's time to see how all of the racers, including Froome, compete on a little fresher legs after the day off.
"I feel bad, it was a really bad, bad crash", said Froome of Porte's spill.
"If everything goes to plan, Richie could be back on the bike at the beginning of August and slowly build his fitness up from there".
"Given where Mont du Chat is in the stage, coming after four big climbs already, and especially after the stage we've just had (on Saturday), it could be a very decisive climb of the Tour", warned Froome, the reigning champion. "It wasn't a swipe at Aru or anything like that". But Froome has so far fought off his rivals.
"It's not enough of a spectacle to see us on the edge of life at more than 190 beats a minute on the climbs, (now also) on unsafe descents where crashes happen every day", complained the 27-year-old Colombian.
"They got what they wanted", after that costly ninth stage, he said. "It was so slippery under the trees".
"But I think after seeing the crash I'm lucky that I have come away with the injuries I have".
"The images of Richie's crash were just absolutely horrific", said Froome who leads the Tour by 18s over Italian Fabio Aru (Astana) and 51s over Frenchman Romain Bardet (Ag2r).
Cannondale rider Uran came up with one final burst at the end of a gruelling 181.5 kilometres route from Nantua, which included three Hors Category climbs, and is now fourth in the general classification standings - with 55 seconds to make up on Froome.
But Quintana's ambitious Giro-Tour double bid appears to be extracting a heavy price - he is now two minutes 13 seconds down in eighth while two-time Tour victor Alberto Contador slipped all the way to 12th after shipping four minutes. "I was in great form and the team were really strong around me, so it's a disappointing. Then the race doctor said exactly the same, so I ended up stopping then, went for a scan and it's broken".
"I'm not regretful at all about having ridden the Giro".