Davydenko suffered the injury when he fell in training
Nikolay Davydenko could miss Russia's Davis Cup tie with India after being forced to pull out of the Dubai Championships with a wrist injury.
The Russian struggled through Tuesday's first-round match before pulling out of his second-round match with Michael Berrer after losing the first set 6-3.
"I thought about quitting before the match, but in practice I was OK. A match is different though," he said.
"It was too much for me, it gets too risky now, and it's better to retire."
Second seed Novak Djokovic survived a minor scare before seeing off fellow Serb Viktor Troicki 3-6 6-4 6-2, but it was the exit of ATP World Tour champion Davydenko that really grabbed the headlines.
"I wasn't happy with the performance overall. But I won, that's what matters," said Djokovic.
"He was a better player for a set and a half. I think this is one of the rare tournaments that you really feel a big, big difference between the day match and night match.
"The balls go really much faster, and as soon as the shade came on the court, I felt more control over my game."
Davydenko had complained of discomfort after his three-set win over Florent Serra on Tuesday, but was clearly in more pain against Berrer.
He frequently over-hit the ball, suffered an early break of serve to go 3-1 down and was unable to break back against the powerful left-hander.
When Davydenko netted a high backhand volley, it was clear he was struggling and was not fit to carry on.
"I thought I could win anyway," said world number 56 Berrer.
"At the moment I am self-confident. My way of playing hurts a lot of guys."
In the last eight, the German will play former Australian Open finalist Marcos Baghdatis, after he beat Indian qualifier Somdev Devvarman 6-3 3-6 6-1.
Sixth seed Marian Cilic came back from 6-3 down in a second-set tie-breaker to defeat Austrian qualifier Stefan Koubek 6-2 7-6.
But there was more success for another Austrian, Juergen Melzer, who beat Spain Tommy Robredo 6-3 7-5.
Seventh seed Mikhail Youzhny of Russia defeated Germany's Bjoern Phau 7-2 6-4, and Ivan Ljubicic beat fifth seed Jo-Wilfried Tsonga 7-5 6-3.