Personalized Walking Adjustments Ease Knee Arthritis Pain, Slow Cartilage Damage

Knee osteoarthritis affects roughly 22% of adults over 40 and ranks among the leading causes of disability in the United States. The condition eats away at cartilage—the smooth tissue that cushions the ends of bones—until everyday movements like walking, climbing stairs, or standing from a chair become painful ordeals. Painkillers can dull the ache, but they do nothing to address the underlying problem: the excessive pressure grinding away at damaged joints. A year-long clinical trial published in The Lancet Rheumatology suggests there may be another way. By making a small, carefully chosen adjustment to how a person walks, researchers found they could reduce knee pain by an amount comparable to medication, and more remarkably, slow the deterioration of cartilage itself.

The insight is biomechanical. The knee has two main sections—an inner compartment and an outer one. During normal walking, the inner section typically bears more of the load, which helps explain why osteoarthritis on the inside of the knee is so common. For people already suffering from this type of damage, each step compounds the injury, pressing down on tissue that is already worn. But the angle at which a person's toes point during walking can redistribute that pressure. Turning the toes slightly inward or outward alters the forces acting on the knee, potentially reducing stress on the affected cartilage. The catch, however, is that the same adjustment does not work for everyone. Some people benefit from turning their toes inward; others respond better when their toes point farther outward. Making the wrong choice could fail to help or even worsen the problem.

Researchers from the University of Utah, New York University, and Stanford University, led by Scott Uhlrich, an assistant professor of mechanical engineering at Utah, took a personalized approach. They recruited 68 participants with mild to moderate osteoarthritis affecting the inner knee. In the laboratory, each person underwent MRI scans and walked on a specialized treadmill equipped with sensors that measured the forces generated with each step. Motion capture cameras recorded their movements in detail. Participants then tested small changes in their foot position—turning their toes inward or outward by either 5 or 10 degrees—while researchers identified which adjustment reduced pressure on the affected knee most effectively for that individual. Some prospective participants were excluded because none of the tested adjustments successfully reduced their knee loading, a screening step that may explain why previous attempts at gait retraining had produced inconsistent results.

After the initial assessments, the 68 participants were randomly divided into two groups. One group received personalized instructions designed to minimize stress on the inner knee. The other received a sham treatment—they went through the same training process but were instructed to maintain their natural foot angle. Both groups attended six weekly training sessions. During these visits, participants walked on a treadmill while wearing a small device on their shin that provided biofeedback, delivering gentle vibrations whenever their foot moved outside the prescribed angle. Over time, participants learned to maintain their assigned foot position without needing constant reminders. After completing the six weeks of supervised training, they were encouraged to practice their walking technique for at least 20 minutes each day until it became a natural habit. Follow-up assessments showed that participants were remarkably consistent, maintaining their prescribed foot angles to within approximately one degree on average.

One year after starting the program, the results were striking. On a pain scale from zero to 10, participants in the intervention group reported an average improvement of 2.5 points, compared with 1.3 points in the sham group. According to Scott Uhlrich, the pain relief fell somewhere between what people typically experience from over-the-counter medications like ibuprofen and prescription painkillers like OxyContin. In an exploratory analysis, approximately 91% of participants receiving personalized retraining experienced a clinically meaningful reduction in pain, compared with 66% in the comparison group. The MRI findings were equally encouraging. Using advanced imaging techniques capable of detecting subtle changes in cartilage composition before major structural damage becomes visible on conventional scans, researchers found that a measurement called T1rho suggested cartilage in the inner knee deteriorated more slowly among participants who changed their walking pattern. These findings do not establish that damaged cartilage was rebuilt or that arthritis progression can be permanently stopped, but they raise the possibility that reducing mechanical stress could help preserve cartilage health over time. The treatment appeared generally well tolerated, with no severe adverse events reported.

Since the 2025 trial, additional research has reinforced these findings. A separate randomized trial published in Clinical Biomechanics in April 2026 investigated different types of biofeedback training in 50 people with knee osteoarthritis. All three groups, including the control group, experienced improvements in activity-related knee pain and physical function. However, only the group receiving feedback about its walking pattern achieved a lasting reduction in a key measure of knee loading—a 7.6% decrease that was maintained at a follow-up assessment one month later. Interestingly, the investigators did not detect significant changes in foot angle in any of the groups, suggesting that other adjustments to walking mechanics can also influence the forces acting on the knee.

For people living with knee osteoarthritis, the appeal of this approach extends beyond laboratory measurements. One trial participant described the freedom of adopting a treatment that required no medication or assistive device: "I don't have to take a drug or wear a device…it's just a part of my body now that will be with me for the rest of my days, so that I'm thrilled with." Once a person learns the technique, it can potentially become part of ordinary daily movement without requiring continued use of specialized equipment. That could be particularly valuable for people who develop arthritis relatively early in adulthood. For someone in their 30s, 40s, or 50s, osteoarthritis could mean decades of pain management before they are recommended for a joint replacement. Personalized gait retraining could help fill that large treatment gap.

One major obstacle remains: delivering personalized gait retraining outside a specialized research laboratory. The original trial relied on sophisticated motion capture equipment, pressure-sensitive treadmill measurements, MRI scans, and repeated in-person visits—resources that are expensive and difficult to provide in ordinary physical therapy clinics. Researchers are exploring ways to make the technology much simpler. Smartphone cameras could help analyze walking mechanics and estimate how different movements influence knee loading. Meanwhile, shoes fitted with motion sensors could provide feedback as patients practice walking at home or around their neighborhoods. Work published in Machine Learning with Applications in September 2026 explored another possibility: using artificial intelligence to estimate knee loading from acceleration measurements collected at the foot. The technology remains experimental and has not yet been validated as a treatment tool for people with knee osteoarthritis, but it illustrates how future rehabilitation systems might provide personalized guidance without requiring a room full of cameras and laboratory equipment. For now, researchers caution that personalized gait retraining is not yet ready for widespread clinical use. The original study included only 68 participants, all of whom had mild to moderate osteoarthritis affecting the inner knee and demonstrated that at least one tested walking adjustment could reduce their joint loading. Larger trials, longer follow-up periods, and practical methods for delivering the treatment will be needed before clinicians can routinely prescribe it. Still, the research points to an intriguing possibility: the way people walk may influence not only how much their knees hurt today, but potentially how well their cartilage holds up in the years ahead.