CAMBRIDGE, Mass. — In the fall of 1994, the psychiatrist Dr. Judith Herman was at the height of her influence. Her book “Trauma and Recovery,” published two years earlier, had been hailed in The New York Times as “one of the most important psychiatric works to be published since Freud.”

Her research on sexual abuse in the white, working-class city of Somerville, Mass., laid out a thesis that was, at the time, radical: that trauma can occur not only in the blind terror of combat but quietly, within the four walls of a house, at the hands of a trusted person.

More than most areas of science, psychology has been driven by individual thinkers and communicators. So what happened to Dr. Herman — as arbitrary as it was — had consequences for the field. She was in a hotel ballroom, preparing to present her latest findings, when she tripped on the edge of a rug and smashed her kneecap.

“Just, wham,” she said. “Smack.”

On and off for over two decades, Dr. Herman groped her way through a fog of chronic pain, undergoing repeated surgeries and finally falling back on painkillers. The trauma researchers who surrounded her in the Boston area moved on with their work, and the field of trauma studies swung toward neurobiology.

“She is a brilliant woman who lost 25 years of her career,” said her friend and colleague Dr. Bessel van der Kolk, whose 2014 book, “The Body Keeps the Score,” helped propel the field toward brain science. “If you talk about tragedy, that is a tragedy.”

At age 81, Dr. Herman rejoined the conversation, publishing “Truth and Repair,” a follow-up to her 1992 book “Trauma and Recovery: The Aftermath of Violence — From Domestic Abuse to Political Terror.” During that period, trauma gained broad acceptance in popular culture as a way to understand mental health.

But the dominant idea now comes from Dr. van der Kolk, who argues that traumatic experiences are stored in the body and can best be addressed through the unconscious mind. “The Body Keeps the Score” has appeared on the best-seller list for 232 weeks. TikTok bulges with testimonials from members of Gen Z, identifying all manner of habits and health conditions as trauma responses.

Dr. Herman does not want to use this flush of attention to debate her old friend. But in “Truth and Repair,” she picks up where she left off in 1992, arguing that trauma is, at its heart, a social problem rather than an individual one.

Drawing on interviews with survivors, she lays out a theory of justice designed to help them heal, centering on the collective acknowledgment of what they have suffered. Her approach is frankly political, rooted in the feminist movement, and unlikely to go viral on TikTok.

This does not seem to trouble her at all. “In my own life, I feel like I’m in a good place,” she said. “On the other hand, psychiatry will have to be dragged, kicking and screaming, into any progressive future.”

A pledge

When Dr. Herman and Dr. van der Kolk met in the 1980s, she treated the daughters of working-class Irish and Italian families who were coming forward with stories of sexual abuse. He had been treating veterans who seemed trapped in the past, exploding with extreme rage at minor frustrations.

She was reserved; he was expansive. Dr. Herman likes to call herself “plain vanilla,” doggedly faithful to psychodynamic psychotherapy; Dr. van der Kolk is “flavor of the month,” always exploring new treatments, first Prozac, then bodywork and eye movement desensitization and reprocessing.

They had this in common: The psychiatric establishment routinely dismissed the patients they treated as malingerers or hysterics. “We were in explicit agreement,” Dr. van der Kolk said. “We noted that people in academia were often very cruel to each other, and we pledged to have each other’s back.”

The diagnosis of PTSD was brand-new, having first appeared in the Diagnostic and Statistical Manual of Mental Disorders, or DSM, in 1980, and the Boston area, Dr. van der Kolk said, “was to trauma what Vienna was to music.” A trauma study group convened monthly in the elegant stretch of Cambridge mansions known as Professors’ Row.

Passing around glasses of sherry and cups of coffee, they argued, Dr. Herman said, about “what counted” as trauma. “The guys who worked with the vets, we had some back and forth, shall we say,” she said. “We had some knockdown drag-outs, calling out the sexism of the men who thought combat trauma was trauma and everything else was just whining.”

Dr. Herman is widely credited with putting this question to rest. “Trauma and Recovery” addressed a general audience in “measured, gripping, almost surgically precise” language, as the Times review put it, and with the authority of a Harvard psychiatrist.

Her ideas also radiated into the communities where she practiced, said Rosie McMahan, whose family worked with Dr. Herman and her colleague Emily Schatzow to confront sexual abuse by her father.

“She did this remarkable thing — ‘Wait a minute, the same things that were happening to those soldiers, in a sense, happened in families,’“ said Ms. McMahan, whose book, “Fortunate Daughter,” describes her family’s reconciliation. “They recognized that it was trauma and called it such. They behaved as if it was.”

Their ideas were gaining ground. In 1994, the editors of the DSM expanded the definition of PTSD, dropping the requirement that the traumatic event be “outside the range of usual human experience.” Dr. Herman and Dr. van der Kolk began lobbying for the inclusion of complex PTSD resulting from recurring or long-term traumatic events.

Then came what’s known as the “memory wars” — a pushback from leading psychiatrists against therapy that encouraged patients to unearth memories of sexual abuse. The criticism often zeroed in on Dr. van der Kolk, who served as an expert witness in high-profile cases, and Dr. Herman, whose work on dissociation was regularly cited by defenders of repressed-memory therapy.

Dr. Herman shrugged off this critique as “predictable,” the same resistance that Vietnam War veterans and rape victims had encountered when they came forward. “You know, history is a dialectical process,” she said. “When you have a movement that challenges the power structure, you will have a backlash.”

Some clinicians did go overboard, Dr. van der Kolk said. They “started talking about satanic ritual abuse, kids being sacrificed in altars,” he said. “It got a little bit weird. Judy and I never went with that crowd. But they were part of our crowd.”

By the time the debate faded, his laboratory at Massachusetts General Hospital had been shut down, and he lost his affiliation with Harvard Medical School. “Almost all of us bit the dust in the memory wars,” he added.

Since the mid-1990s, the editors of the DSM have consistently opposed further expanding the definition of PTSD. The original intent was “intentionally strict, meant to avoid the possibility that all mental disorders are simply caused by trauma,” said Dr. Allen Frances, who chaired the DSM’s fourth edition task force.

While stress contributes to most psychiatric problems, he said, PTSD diagnoses can be made quickly and carelessly without pursuing underlying mental disorders, such as anxiety and depression. Taking that leap, he added, means “all the rest of the knowledge ever accumulated about mental disorders goes out the window.”

Dr. Frances was similarly skeptical of “trauma-informed therapy,” which he said provided “a misleadingly reassuring explanation” too complicated psychiatric problems. He added that proponents of the idea, like Dr. Herman and Dr. van der Kolk, had won over a large part of the general public.

“You can write best-sellers on this because it’s an appealing model for people searching for an explanation for the distress in life,” Dr. Frances said. That avenue was closing. But that wasn’t the only thing that happened.

On the day she broke her kneecap, Dr. Herman was preparing to deliver a workshop on her latest findings and was carrying a carousel of slides to a projector. She was distracted and did not see that binding had come loose from the rug.

Dr. Herman has offered vague explanations for the 30-year gap between her books. “Life intervened, in the form of illnesses and a move to an assisted-living community,” she writes in a forward to “Truth and Repair.” She flicked away the question in an interview, calling it “a very long, sad tale which I won’t bore you with.”

But there is a story. Her kneecap healed, but nerve tumors had formed in her leg, and the pain grew steadily worse. For long stretches, daily life became a challenge. There were remissions, but there were also times she could not get out of bed, where even changing positions was “extremely, extremely painful.” She was so desperate that she asked a doctor if he could amputate her leg.

“All you could think about was pain,” she said. “It wasn’t even thinking about pain. It was being pained. One’s existence was just pain. It’s like being in a tunnel.” Like “Your whole existence is pain, and nothing exists outside of it,” she added.

There was a subtext in her doctors’ response early on, which she, as a fellow physician, was uniquely qualified to identify: They did not quite believe her. “I was a middle-aged woman with pain of unexplained origin,” she said. In the jargon of medical residents, she said, she was a “crock,” or a female hypochondriac.

Eleven years and three surgeries later, her doctors said there was nothing more they could do. This was the worst when there was no hope of reprieve. “It made me not want to live,” she said. “That is literally what happened.”

“Judy’s fall had a gigantic impact,” Dr. van der Kolk said. “When you talk about suffering, that was suffering. She was suffering physically. A large part of the joy and triumph of publishing a great book she did not get to enjoy.”

He also said the injury had created a distance in their relationship. He was on fire with the ideas that would later become “The Body Keeps the Score,” among them a view that chronic pain may express suppressed trauma. He thought he could help. But she was, he said, “too injured to be all that curious.” After that, he said, “Judy and I started to go in different directions.”

“It was the source of sadness on my part, as I was entering this body world, that Judy did not go in the same direction,” he said.

Dr. Herman had little recollection of this exchange. But she did not see any more significant meaning to her pain; it was just pain, a bunch of malfunctioning neurons, and it preoccupied her entirely. She was fitted with a brace and crutches and managed to continue teaching and supervising trainees by taking large doses of fentanyl, applied through a transdermal patch.

Asked what the experience taught her, she paused and said, “I guess I just had more empathy for people who go through various forms of torture.”

A remedy appeared in 2019, almost by chance. She had gone to see a surgeon about arthritis in her hand, and instead, he peered at her knee. After she left, he emailed her an article about a surgery developed at Walter Reed National Military Medical Center to treat amputees, war veterans from Iraq and Afghanistan.

Later that year, surgeons removed the damaged nerves, sutured them to a motor nerve harvested from her quadriceps, and implanted them into her muscle. She weaned herself off fentanyl and set aside the brace and the crutches. She compared the relief she felt to women's sensations when childbirth ended.

“I mean, it’s heavenly,” she said. “I’m in a permanent state of gratitude.”

And that, she said, was why she had the energy to finish another book.

“It’s a crazy story,” she said. “I owe it all to the forever wars.”

The Mother of Psychotraumatology Field

When Dr. Herman walked into a launch event at the Harvard Book Store last month, wearing orthopedic shoes and multiple shades of purple, there was an intake of breath from the audience, comprised mainly of older women in mental health professions.

The store offered books on healing trauma through weight lifting, quitting one’s job, or blocking the nerves known as the stellate ganglion; books on trauma in the music of Dolly Parton, polyamorous families, and the Indian caste system; and, of course, “The Body Keeps the Score,” one of those books that, the store’s buying manager said, “even people who aren’t necessarily readers have heard about.”

This did not escape Dr. Herman’s admirers, who waited in folding chairs, grumbling discreetly about the authors who rode on her coattails. “All the noise around trauma is all about white men,” remarked a psychiatric nurse specialist Mary Gorman. “It’s like she’s the forgotten stepchild.”

Dr. van der Kolk, who has been helping Dr. Herman to publicize her book, was acutely aware of this dynamic. “The Body Keeps the Score,” he said, benefited enormously from its focus on neurobiology. “In the culture right now, if it’s based on the brain, it’s real,” he added. “Everything else is woozy stuff.”

As his book neared publication, he said, he worried that it would supplant Dr. Herman’s as the best-known title on trauma. “She must have known that, to some degree, I would bump her to the second position,” he said. “I wondered how she would deal with it.”

Considering the whole story, he sounded stricken. Were it not for her injury, he said, “Judy really would have been the queen of trauma.”

Dr. Herman, in contrast, sounded cheerful as she looked back on it all. She said that for a woman of her generation to become, a full professor at Harvard was a big deal. As for the years lost to pain, she said that the work she had done in her 40s and 50s had already helped to launch a generation of younger scholars.

“It wasn’t so much of a cult of personality,” she said. “All that haunts the field. But in my case, once ‘Trauma and Recovery’ came out, I wasn’t the only messenger.”

At 81, she has the aches and pains of old age but cannot shake the feeling of having been reborn. She sees a return to the politics that shaped her as a young doctor in the Black Lives Matter, the #MeToo movement, and the psychiatric residents she supervises.

“I’m back in that exploring kind of moment,” she said. “It’s quite exciting. I wish I had a 40-year-old body instead of an 80-year-old one to keep up with it.”

Ellen Barry covers mental health. She has served as The Times’s Boston bureau chief, London-based chief international correspondent, and bureau chief in Moscow and New Delhi. She was part of a team that won the 2011 Pulitzer Prize for International Reporting.