Dr. Fishman said he successfully treated a former basketball player, who responded immediately, and a 40-year-old magazine photographer who had torn his rotator cuff while on assignment. The photographer, he said, had been unable to lift his arm high enough to shake someone’s hand.

Instead of an operation that can cost as much as $12,000, followed by four months of physical therapy, with no guarantee of success, Dr. Fishman’s treatment, is an adaptation of a yoga headstand called the triangular forearm support. His version can be done against a wall or using a chair as well as on one’s head. The maneuver, in effect, trains a muscle below the shoulder blade, the subscapularis, to take over the job of the injured muscle, the supraspinatus, that normally raises the arm from below chest height to above the shoulder.

The doctor discovered the benefit of this technique quite accidentally. He had suffered a bad tear in his left shoulder when he swerved to avoid a taxi that had pulled in front of his car. Frustrated by an inability to practice yoga during the month he waited to see a surgeon, one day he attempted a yoga headstand. After righting himself, he discovered he could raise his left arm over his head without pain, even though an M.R.I. showed that the supraspinatus muscle was still torn.

Dr. Fishman, who has since treated more than 700 patients with this technique, said it has helped about 90 percent of them. “It doesn’t work on everyone — not on string musicians, for example, whose shoulder muscles are overtrained,” he said in an interview.

In a report published this spring in Topics in Geriatric Rehabilitation (an issue of the journal devoted to therapeutic yoga), he described results in 50 patients with partial or complete tears of the supraspinatus muscle. The initial yoga maneuver was repeated in physical therapy for an average of five sessions and the patients were followed for an average of two and a half years.

The doctor and his co-authors reported that the benefits matched, and in some cases exceeded, those following physical therapy alone or surgery and rehabilitation. All the yoga-treated patients maintained their initial relief for as long as they were studied, up to eight years, and none experienced new tears.