She returned July 30 for an adjustment, said the woman, who visited the center 12 times since 2010.
On July 30, the woman said, she lay on her back wearing only her underwear while Walcott massaged her arms, torso and back with a vibrator, as he had done during previous visits. No one else was present.
At one point during the session, she said, Walcott pulled down her panties "enough to insert his fingers" inside her.
When she told him to stop, the woman said, Walcott told her that he had done the same thing with three other women who asked him to do so.
"He said, 'What can I do to make this up to you? Do you want free massages?' " the woman recalled.
"I said, 'I'm out of here,' " said the woman, who called the police later that day.
Defense attorney Michael J. Engle said Walcott - who is free on bail and remains in business - did nothing improper and will fight the charges.
"It never happened, it's a complete fabrication," Engle said after the hearing. "He has hundreds of patients that love him, who have expressed that they can't believe that this would have ever happened and will be here in court to testify as character witnesses for him."