The Spaniard dislocated his left shoulder in the fall, which came just three hours before he was due to line up on pole at Silverstone.
Doctors were able to pop his shoulder back into place and, with the aid of painkilling injections, Marquez went on to stage an incredible fight for victory with Jorge Lorenzo, only losing out in the final corner, and by less than one tenth of a second.
In the process he also extended his championship advantage to 30 points - something he had believed impossible in the immediate aftermath of his crash.
"After the morning I thought my weekend was finished," Marquez said. "I dislocated my shoulder and it was quite painful.
"But the doctors did a very good job, I feel not so bad so I say 'OK, I will try'.
"For the beginning [of the race] the pain was not a problem, but the most difficult point was at the end.
"I was quite tired and I felt my shoulder was not strong enough, especially changing direction from left to right. But I was so happy because even like that I was able to fight with Jorge to the last corner.
"I try on the last lap, I pass him but when I changed direction [at Luffield] I went a little bit wide and said 'OK, Jorge will go in, sure'.
"He did a very good job and I just congratulate him and now concentrate on trying to repair the shoulder.
"This circuit is one where Jorge and Yamaha are quite strong, so I'm happy we opened four points in the championship."
Marquez said his race-long attack was proof that he will not abandon his swashbuckling style in order to preserve his points lead over the final six races.
"Its true, taking 20 points was important for the championship - we are 30 points in front, 39 with Jorge," he said.
"Sometimes you need to take decisions. But you saw that I still take the same risks, with or without those points.
"The battle was so nice, I enjoyed it. Always I will try to push and be there."
- Sports & Recreation
- Jorge Lorenzo