If it ain’t broke, don’t fix it, Nikola Jokic believes. And in this case, it’s only sprained. Jokic has used a shooting sleeve on his right arm three consecutive games after sustaining a mysterious elbow injury last Wednesday, purportedly while warming up for a game against Houston that night — even though he was already wearing the sleeve when he warmed up. The specific origins of the sprain may never be known. “It was just an accident,” Jokic said with an embarrassed laugh in the Nuggets’ locker room Tuesday night.