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Objectives and questions: Isolated intertrochanteric rotational osteotomy (ITO) has been applied for the correction of symptomatic pathological femoral torsion as an extra-articular deformity. While long-term outcome analyses have been reported elsewhere, the methodological aspects of assembling historical cohorts and reconstructing long-term clinical course from institutional documentation remain insufficiently described. The objective of this ePoster is to describe cohort structure, indication framework, and documentation-based follow-up methodology after isolated ITO.

Material and methods: A single-center retrospective cohort was identified from institutional surgical records, including patients treated with isolated intertrochanteric rotational or derotational osteotomy between 2002 and 2009. Predefined inclusion and exclusion criteria were applied to assemble a homogeneous cohort without concomitant acetabular or intra-articular procedures. The dataset originates from a doctoral dissertation with extended observational follow-up. Case identification workflow, indication principles, surgical concept, and available follow-up sources were summarized descriptively. Consistent with the historical treatment period, cross-sectional imaging for standardized quantitative torsion measurement was not routinely available; therefore, rotational correction was documented based on structured clinical assessment and operative reports. In accordance with the predefined methodological focus, no statistical analyses or outcome evaluations were performed.

Results: A long-term cohort of 60 patients treated with isolated femoral rotational correction was assembled. Reconstruction of the long-term clinical course was primarily based on institutional documentation and follow-up records. Completeness and granularity of available information varied across the extended observation period, reflecting the inherent characteristics of retrospective long-term datasets reconstructed from routine clinical documentation. The present abstract is intentionally restricted to cohort composition, documentation structure, and follow-up methodology and does not address functional outcomes, complication rates, or treatment effectiveness.

Discussion and conclusions: This ePoster provides a structured, documentation-focused overview of cohort assembly and long-term observational methodology after isolated intertrochanteric rotational osteotomy. By explicitly addressing data sources, documentation limits, and historical treatment context, it illustrates how long-term hip preservation cohorts can be reconstructed for subsequent scientific analyses. The present ePoster is based on the same institutional cohort as previously submitted outcome- and safety-focused analyses but addresses a distinct methodological research objective, thereby avoiding data duplication and preserving the scientific independence of subsequent publications.