"After Eros" When X-rays presented evidence of a spinal injury that doctors said should have put her in a wheelchair, the choreographer Maureen Fleming asked her mother for more information about a childhood injury she had suffered outside an American Navy base in Japan. "A man on a bicycle darted in front of my mother's car," Fleming says, "And when my head went through the windshield, the man laughed and rode away." The choreographer could not recall the incident, but she did remember inventing a type of slow and sinuous dance as a child-a twisting movement that doctors said kept mobility in joints that otherwise would have needed to be surgically fused. Though Fleming returned to Japan as an adult to further explore this slow, healing movement with Butoh masters, its instinctive origins remain something of a mystery-a mystery she has commemorated by naming this program with an allusion to the man who, with a laugh, rode off, like Eros, "It's a feminine response," she says. "Not 'I have to find this man' but something more regenerative: facing one's pain instead of running away." (Playhouse 91, at 316 E. 91st St. For information about tickets, calls 966-1100. Dec. 21 at 8 and Dec. 22 at 3 and 8.