LDRT for Older Adults Who Can't Have Surgery

There comes a point for many older adults when the usual path runs out. The knee or hip still hurts every day. Physical therapy helped a little and then stopped helping. Injections wore off faster each time. And the operation that would fix the joint outright is off the table, because the heart or lungs would not take anesthesia well, because blood thinners cannot safely stop, because frailty or other illness makes a hospital stay too risky, or simply because you have decided you do not want it. Low-dose radiation therapy, or LDRT, is one option for that situation. It has been used in Germany for decades.

It Is Your Health, Not Your Birthday, That Rules Out Surgery

Age alone is a poor reason to refuse someone an operation, and the surgical literature says so. In a single-center review of elective hip replacements, 609 patients aged 80 and older had the same perioperative complication rates and the same patient-reported outcome scores as younger patients, though they stayed in the hospital longer, 3.5 days on average compared with 2.5 days, and were more often discharged to a skilled nursing facility, 9.3 percent compared with 2.6 percent^[1]. A systematic review of eight studies covering 494,144 patients found perioperative death rates between 0.33 percent and 1.96 percent in the older group, with longer hospital stays, and concluded that eligibility should rest on comorbidities and overall health rather than age alone^[2].

So if a surgeon has told you no, it is usually about the whole picture, not the number. Heart disease, lung disease, kidney trouble, diabetes that is hard to control, a history of blood clots or bleeding, frailty, or a prior bad reaction to anesthesia can each tip the balance. Sometimes it is a combination that no single diagnosis explains. Whatever the reason, it is worth asking the surgeon to spell it out, because the same health picture also shapes whether LDRT makes sense, and a radiation oncologist will want to know it too.

It is also worth saying that choosing not to have surgery is a valid decision on its own. Some people at 80 or 85 simply do not want a major operation and months of rehabilitation, even if a surgeon would do it. LDRT does not require you to justify that choice to anyone.

Why the Usual Alternatives Also Narrow With Age

Painkillers get trickier as you get older. The American Geriatrics Society advises avoiding nonsteroidal anti-inflammatory drugs, or NSAIDs, like ibuprofen and naproxen in older adults when alternatives exist, because upper gastrointestinal ulcers, gross bleeding, or perforation occur in about 1 percent of patients treated for 3 to 6 months and in 2 to 4 percent of patients treated for a year, and the drugs can also raise blood pressure and injure the kidneys, with risks that grow with dose and duration^[3]. That matters most for people who also take blood thinners, steroids, or antiplatelet drugs, where the bleeding risk climbs further^[3]. Acetaminophen is gentler on the stomach but often too weak for bone-on-bone pain, and opioids bring their own problems at older ages, including falls, confusion, and constipation.

Injections have a different limit. A cortisone shot can quiet a joint for a while, but the relief fades, and repeating shots indefinitely is not a plan most doctors like. LDRT is not a stronger version of an injection. It works differently, by calming inflammation in the joint with a low dose of radiation, and when it works, the benefit is judged over months rather than weeks. The German DEGRO guideline says the effect of a course should be judged after 2 to 3 months^[4]. That slow build is worth knowing before you start, so an unchanged first week does not feel like failure.

What the Evidence Shows in Older Patients Specifically

Older adults are the main group studied in this research. A large German series from two university hospitals followed 970 patients aged 65 and older with 1,185 treated sites. About two thirds, 65.6 percent, reported a pain response, and the researchers found no significant difference in pain response between age groups^[5]. For patients who did not respond well enough, a second course was given, and 61.0 percent of those responded 8 weeks later^[5].

A modern American series points the same way for adults generally. In 69 patients with 168 treated joints, each phase was 3 Gy in six visits of 0.5 Gy over 2 to 3 weeks, the average relevant pain score fell from 6.3 before treatment to 4.0 at the end of treatment and was still 4.0 at the 10 week follow-up, and 80 percent of joints showed significant improvement at the end of treatment, with 72 percent maintaining it at follow-up^[6]. That series had no control group, so it cannot prove the treatment caused every bit of improvement, but it shows what United States programs are actually seeing.

Not all the evidence is this positive. A 2025 systematic review and meta-analysis pooling 12 studies with 1,750 participants found that across sham-controlled trials, LDRT did not significantly outperform sham treatment for average pain or for function^[7]. The uncontrolled series, including the large elderly cohort above, report much better results than the sham-controlled trials do. Because of that gap, no one can promise you relief. It is also why a good program tracks your pain scores before and after, so your own result is measured rather than assumed.

What a Course Actually Asks of You

Very little, compared with surgery. There is no anesthesia, no incision, no hospital stay, and no rehabilitation program. A typical course is six short visits over 2 to 3 weeks, each visit lasting about 10 to 15 minutes, with the beam itself on for only part of that time. You lie still, the machine does its work, and you go home. There is no recovery time and nothing radioactive left in your body afterward, so you do not need to keep your distance from family.

The practical burden is the trips. Six visits means six rides, and for someone who no longer drives, that is the real logistics problem, not the treatment itself. Line up rides or medical transport before the first visit, and ask the program whether visits can be grouped with other appointments. If you use a walker or a wheelchair, tell the program in advance so the treatment room setup is ready.

Two more practical points matter at older ages. First, LDRT does not close off later surgery. Loyola Medicine, which offers LDRT, says it does not prevent joint replacement later, and that because the dose is low, later surgery remains safe^[8]. If your health improves, or if you change your mind about an operation, that door is still open. Second, a repeat course is possible. In the American series above, 33 percent of joints went on to receive a second phase of the same 3 Gy in six visits, with further pain reduction^[6]. That series had no control group, so it cannot prove the second course caused the extra improvement, but it shows a second course is a real option some programs use.

Safety and the Long-Term Question at Older Ages

Short-term side effects are usually mild. In the Korean sham-controlled trial of 114 knee patients, no treatment-related toxicities were reported^[9]. Our side effects page covers the full list, including the rare ones.

The long-term question is cancer, and age matters here. Radiation-induced cancers, when they occur, typically take many years to appear. A person treated at 85 has fewer years ahead for such a risk to play out than a person treated at 45. The largest long-term safety analysis, 4,699 patients treated between 1994 and 2011, found only three solid cancers inside previously treated regions, an incidence of 0.064 percent, though it also found a small difference in blood-cancer-free survival for treatment near bone marrow, which matters more for spine and shoulder treatment than for a knee or hand^[10]. Low is not zero. But for an older adult weighing daily pain against a small theoretical risk years out, the balance often looks different than it does for a younger patient, and that is a legitimate part of the decision.

Questions Worth Asking Before a Course

• Am I being offered this because surgery is unsafe for me, or because I have chosen not to have it, and does that change anything about the plan?
• What has already been tried for this joint, and is there anything simpler left worth trying first?
• How many patients my age has this program treated, and what did they report?
• What total dose and how many visits are you planning, and when will you judge the result?
• What medicines should I keep taking, and do any of them need to pause around treatment?
• How will I get to six visits, and can the schedule work around my rides and other appointments?
• If this helps, how long might it last, and what happens if the pain comes back?
• If it does not help, does anything about this treatment affect a future operation?

Being unable to have surgery can feel like running out of options. It is not quite that. LDRT will not rebuild a joint, and it will not help everyone who tries it. But for an older adult whose pain has outlasted pills, therapy, and injections, and for whom an operation is unsafe or unwanted, it is a real option with a short, gentle course and studies that include many people over 65. Bring a family member to the consultation if that helps, bring your medication list, and ask the program to measure your pain before and after, so you will know, in numbers you trust, whether it worked for you.

References:
1. Zak SG, Lygrisse K, Tang A, Meftah M, Long WJ, Schwarzkopf R. Primary total hip arthroplasty outcomes in octogenarians. Bone and Joint Open. 2021;2(7):535-539 (609 patients aged 80 and older vs younger patients; equivalent perioperative complication rates and outcome scores; hospital stay 3.5 vs 2.5 days; discharge to skilled nursing 9.3% vs 2.6%). Bone and Joint Open
2. Rusche A, Osterhoff G, Roth A, Schopow N. Perioperative outcome of primary total hip arthroplasty in octogenarians: a systematic review. Journal of Orthopaedics. 2025;60:152-158 (8 studies, 494,144 patients; perioperative mortality 0.33% to 1.96% in the older cohort; longer hospital stays; eligibility should rest on comorbidities and overall health, not age alone). PMC
3. American Geriatrics Society 2023 Updated AGS Beers Criteria for Potentially Inappropriate Medication Use in Older Adults. Journal of the American Geriatrics Society. 2023 (upper gastrointestinal ulcers, gross bleeding, or perforation in about 1% of patients treated with an NSAID for 3 to 6 months and 2% to 4% for 1 year; NSAIDs can raise blood pressure and induce kidney injury; risks are dose related; risk higher with corticosteroids, anticoagulants, or antiplatelet agents). DOI
4. Ott OJ, Niewald M, Weitmann HD, et al; German Cooperative Group on Radiotherapy for Benign Diseases (GCG-BD). DEGRO guidelines for the radiotherapy of non-malignant disorders. Part II: Painful degenerative skeletal disorders. Strahlentherapie und Onkologie. 2015;191(1):1-6 (effect judged after 2 to 3 months). PubMed
5. Rühle A, Tkotsch E, Mravlag R, et al. Low-dose radiotherapy for painful osteoarthritis of the elderly: a multicenter analysis of 970 patients with 1185 treated sites. Strahlentherapie und Onkologie. 2021;197(10):895-902 (970 patients aged 65 and older at two university hospitals; 65.6% reported a pain response; no significant difference in pain response between age groups; 61.0% response 8 weeks after a second course). DOI
6. Koneru BN, Sick J, Shaikh HA, Spengler H, Small W Jr, Shaffer R. Low-dose radiation therapy for osteoarthritis: a retrospective single-institution analysis of 69 patients and 168 joints. International Journal of Radiation Oncology, Biology, Physics. 2025;123(2):352-360 (each phase 3 Gy in 6 fractions of 0.5 Gy over 2 to 3 weeks; relevant pain score 6.3 before treatment, 4.0 at end of treatment, 4.0 at 10 week follow-up; 80% of joints significantly improved at end of treatment, 72% maintained at follow-up; 33% of joints received a second phase with further pain reduction; retrospective, no control group). PubMed
7. Hammadeh BM, Aldalati AY, Al Matairi A, et al. Efficacy, safety, and pain management of low-dose radiation therapy in osteoarthritis: a comprehensive systematic review and meta-analysis. Rheumatology International. 2025;45(9):210 (12 studies, 1,750 participants; across sham-controlled trials, no significant benefit over sham for pain, standardized mean difference -0.92, p = 0.13, or function, standardized mean difference 0.22, p = 0.22). Springer
8. Harkenrider M. Low-Dose Radiation Therapy for Osteoarthritis. Loyola Medicine (LDRT does not prevent joint replacement surgery in the future; because of the low dose, later surgery remains safe). Loyola Medicine
9. Kim BH, Ro DH, Wang JH, et al. Single course low-dose radiation therapy in knee osteoarthritis (LoRD-KNeA): a randomized controlled trial. BMC Medicine. 2026 (114 patients; no treatment-related toxicities reported). BMC Medicine
10. Risk of radiation-induced malignancy after low-dose radiotherapy for non-malignant musculoskeletal disorders: a long-term retrospective analysis of n=4699 patients. International Journal of Radiation Oncology, Biology, Physics. 2026 (4,699 patients treated 1994 to 2011; three solid malignancies inside treated regions, 0.064%; blood-cancer-free survival at 12.5 years 99.0% away from marrow vs 97.7% near marrow). PubMed