The scale of the problem the guideline addresses is enormous. In the European Union alone, an estimated 22.1 million women and 6.6 million men aged fifty and older were living with osteoporosis in 2019, and 4.3 million new fragility fractures were reported that year. Germany carries a heavy share of this burden: roughly 4.5 million women, or 22.6 percent of the female population, and 1.2 million men are affected, together accounting for about 6.1 percent of the total population. A demographic simulation model projects that fractures attributable to osteoporosis in Germany will climb from 115,000 in 2010 to 274,000 in 2050, accumulating roughly 8.1 million fractures over that period and discounted costs of 88.5 billion euros.

What makes these numbers so troubling is that a proven countermeasure already exists. A substantial body of evidence shows that physical exercise, when properly designed, strengthens the muscular system, improves balance, and reduces the risk of falls and fall-related fractures in older adults, including those with confirmed bone loss. Patients with suspected or confirmed osteoporosis are routinely referred to physiotherapy to tackle fall risk, pain, restricted range of motion, posture, and declining physical function. Yet until recently, German physiotherapists had to work from the interdisciplinary 2023 national osteoporosis guideline, which offers only a few general statements about physiotherapy, or from a 2009 physiotherapy guideline that was never updated.

Building a brand-new guideline from scratch demands years of work, deep expertise, and considerable funding, so the team chose a smarter route: guideline adaptation. This internationally recognized approach takes an existing, high-quality guideline from another country and carefully reshapes it for a new healthcare context. The researchers structured their project around six modules, informed by the ADAPTE Collaboration framework, a methods paper from the German Society for Physiotherapy Science, and established procedures for cross-cultural adaptation of health measures. The study protocol was published prospectively on the Open Science Framework before the work began, and the project received ethical approval in Germany.

The first three modules formed a methodical search-and-select pipeline. Following the PRISMA 2020 reporting standards, the team searched three scientific databases, including MEDLINE, PEDro, and Web of Science, plus nine international guideline databases and relevant professional websites. They screened 873 records in total, 207 from databases and 666 from other methods, applying strict inclusion criteria: the document had to be a comprehensive guideline written specifically for physiotherapists, focused solely on osteoporosis management, published in German or English within the previous five years, and of acceptable methodological quality. Two reviewers screened independently at both the title-abstract and full-text levels, resolving disagreements through discussion.

Two candidates survived the funnel: the 2022 guideline from APTA Geriatrics, the Academy of Geriatric Physical Therapy of the American Physical Therapy Association, authored by Gregory Hartley and colleagues, and the 2022 UK consensus statement on physical activity and exercise for osteoporosis by Brooke-Wavell and colleagues. Both were appraised with the AGREE II instrument, the international gold standard for guideline quality, which rates 23 items across six domains including rigor of development and editorial independence. The American guideline scored 50 percent overall, the UK statement 58 percent, but the APTA Geriatrics document performed better on the two decisive domains, rigor of development and editorial independence, and was selected for adaptation.

Translation came next, and here the team embraced a strikingly modern technique. Rather than relying on a single human translator, they ran the English guideline through two artificial intelligence systems, the Perplexity AI search engine and the neural machine translation service DeepL, producing two independent German versions. Two researchers then synthesized these into a first draft, flagging every word or sentence rated critical or unclear. The draft, along with both AI translations and the original English text, went to a four-member expert committee: two clinical specialists in geriatric physiotherapy and two methodological experts in guideline development, who assessed linguistic accuracy, medical terminology, fit with the German healthcare system, and consistency with the 2023 German interdisciplinary osteoporosis guideline.

A virtual consensus meeting produced a second draft, which then faced its toughest critics: the people who would actually use it. Three practicing physiotherapists, aged 26 to 34 and treating between 2 and 50 osteoporosis patients per month, reviewed the draft for comprehensibility, readability, and feasibility, and gave interviews lasting up to 47 minutes. Two women with osteoporosis, aged 75 and 80, also reviewed the recommendations section. Their feedback drove concrete changes: a definition of impact training was added to a new glossary, the colors distinguishing different exercise types were made more contrasting and red and green were avoided to help visually impaired readers, and the potentially confusing pronoun we was replaced with neutral wording. The patients found the recommendations generally feasible, though some, such as progressive resistance training and jogging, exceeded their personal health restrictions, which the team judged to be individual limitations rather than flaws in the guideline.

Critically, none of the clinical recommendations themselves were altered. The adaptations were contextual: a note pointing German readers to national fall-prevention training recommendations from the Federal Initiative for Fall Prevention, a glossary defining terms such as low-trauma fracture and weight-bearing exercise, color-coded exercise categories, person-first and gender-conscious language, and the omission of the original implementation chapter, which described the American healthcare system and did not transfer. The original guideline’s developers reviewed and approved every change, and the final German version was signed off by the entire research team. It is now available open access on the Open Science Framework, and the team has announced it through national physiotherapy associations, published an accompanying article in a clinical journal, and launched an educational course already delivered in two German physiotherapy clinics with promising evaluations.

The project also reveals an interesting divergence within German-language guidance. A newly published guideline from the osteology umbrella association DVO on physical exercise for fracture prevention clearly recommends high-intensity strength training and impact loading such as jumping and rapid stair climbing where individually feasible, while the adapted APTA Geriatrics guideline is more cautious, emphasizing individual fracture-risk stratification and tailored loading. The two documents contain no fundamental contradiction; they simply emphasize different things, one focusing on what is effective and the other on identifying who should do it and under what safety conditions. Together they give German-speaking physiotherapists a two-pillar evidence base. The authors are candid about limitations, including an unupdated search, a small user-review panel, no formal back-translation, and the source guideline’s own reliance on evidence ending in 2018. Still, the work stands as a template: it shows that careful, participatory adaptation, with AI translation as a starting point rather than a shortcut, can move trustworthy clinical evidence across languages and health systems, and it hands millions of patients with fragile bones a far better chance that the therapy they receive matches the best science available.

Subject of Research: German translation and contextual adaptation of a US clinical practice guideline for physiotherapy management of osteoporosis

Article Title: Physical therapist management of patients with suspected or confirmed osteoporosis – German translation and contextual adaptation of a clinical practice guideline from the Academy of Geriatric Physical Therapy (USA)

Article References: Physical therapist management of patients with suspected or confirmed osteoporosis – German translation and contextual adaptation of a clinical practice guideline from the Academy of Geriatric Physical Therapy (USA). (n.d.). https://doi.org/10.3389/fresc.2026.1933821

Image Credits: AI Generated

DOI: 10.3389/fresc.2026.1933821

Keywords: osteoporosis, physiotherapy, clinical practice guideline, guideline adaptation, fracture prevention, exercise, AGREE II, ADAPTE, machine translation, geriatric rehabilitation, Germany, fall prevention