Many people shrug off knee pain—especially when it flares up while walking down stairs—as a natural consequence of getting older. But when pain leads you to avoid walking or going out altogether, thigh muscle strength can quickly drop, leaving you far more vulnerable in everyday life. Instead of automatically blaming old age, it is worth taking a hard look at how your knee is actually functioning right now and whether you need medical treatment.
Redefining Surgical Limits for Advanced Age
Advanced age alone no longer rules out surgical options. Doctors now routinely provide targeted joint treatments or perform artificial joint replacement surgery after evaluating overall health and surgical risks—not just for patients in their 70s and 80s, but also for those aged 90 and older. In the past, many people firmly believed they had to "just live with it because of old age," or that they should delay an artificial joint procedure for as long as possible. Increasingly, clinicians are moving away from delaying care based on age alone, choosing instead to weigh a patient’s health status and physical function when deciding whether to treat.
Moon Sung-chul, director of the Joint Center at Nanuri Hospital, notes that this change reflects a broader shift in how clinicians approach patient care. "Degenerative osteoarthritis isn't simply an inevitable disease that comes with aging—it's a condition that can significantly reduce a patient's activity level and overall quality of life," Moon Sung-chul said on the 15th. "This is no longer an era of giving up on treatment based on age alone; it's an era of comprehensively evaluating a patient's health status and symptoms to choose the most appropriate treatment path."
Looking Beyond the X-Ray Image
Degenerative osteoarthritis is typically classified into stages 1 through 4 on X-rays, but hospitals do not decide on surgery based on the stage alone. Even among patients diagnosed with stage 4, some manage daily life without significant pain, while others struggle to walk even at stage 3. In those cases, key criteria include whether the joint damage is limited to only part of the knee, as well as the patient's leg alignment and ligament condition. If those conditions are favorable, clinicians can consider treatments that preserve the patient’s own joint as much as possible, such as an osteotomy (surgery that cuts a bowed leg bone to correct the alignment angle) or a partial knee replacement. By contrast, if the damage is extensive and accompanied by severe pain and functional decline, doctors will consider a total knee arthroplasty.
However, advanced imaging tests such as MRIs are not repeatedly performed for every patient. If symptoms suddenly worsen, the knee becomes hot and swollen, or other atypical symptoms appear—or if damage is suspected that cannot be explained by X-ray alone—an MRI is utilized to further check the condition of the remaining cartilage, the meniscus (the crescent-shaped cartilage inside the knee that absorbs shock), and the synovium (the thin membrane surrounding the joint that produces lubricating synovial fluid).
"In degenerative osteoarthritis, the patient's actual pain and degree of functional decline are far more important than the stage seen on an X-ray," Moon Sung-chul stressed. "Treatment decisions should be made by looking at the patient, not just the images."
The True Lifespan of Modern Implants
Once testing and diagnosis lead to a decision to proceed with artificial joint surgery, the next major question is longevity. This concern is often the biggest reason why many patients hesitate to undergo surgery.
Looking across clinical data, more than nine out of 10 people are still doing well without needing revision surgery 10 years after an artificial joint replacement. A review article published in a Korean medical journal reported that the 10-year survival rate among Korean patients was 94.7%, showing no significant difference from Western patients (94.8%). Large-scale joint replacement registry data from the United Kingdom also showed a 10-year survival rate of 96.7%. As the time horizon lengthens, however, survival rates gradually decline: an international study pooling data from multiple countries found that after 25 years, the survival rate fell to the 82% range. In this context, "survival rate" does not mean the artificial joint remains completely unchanged in the body; rather, it means the implant has held up effectively without the need for a second revision surgery.
"Today's artificial joints boast a 10-year survival rate of 95% to 98%," Moon Sung-chul said. "Especially for patients aged 60 and older, receiving treatment at the right time—rather than missing the window because of vague fears—can actually be a definitive way to extend healthy life expectancy."
Preserving Joint Health Before Considering the Operating Room
Still, the ultimate goal of treatment is not surgery alone. Exercises tailored specifically to the patient—such as thigh-strengthening workouts, walking, stationary cycling, or low-impact aquatic exercise—can successfully help reduce pain and maintain vital joint function. For individuals who are overweight or obese, losing weight alone can significantly reduce the mechanical burden placed on the knee. Correcting lifestyle habits that excessively bend or stress the knee and maintaining a routine of consistent stretching also play a major role in protecting the joint. If pain or swelling persists for a long time after exercise, you should adjust the physical intensity and method.
"Treatment for degenerative osteoarthritis isn't about rushing blindly into artificial joint replacement—it's a careful process of helping patients use their own natural joints for as long and as healthily as possible," Moon Sung-chul said. "When needed, we should also actively perform appropriate surgery so that patients can keep walking longer and maintain independent living—that is the most important goal of joint treatment today."
Rather than dismissing persistent knee pain as an unavoidable tax of old age, it is highly rewarding to take a careful look at the signals your knee is sending right now.
