Comparative Analysis of Relaxed- and Flexed-Seated Radiographs for Assessing Spino-Pelvic Mobility in Total Hip Arthroplasty

Andreas Fontalis; Humza Osmani; Maël Guerra-Perron; Fabio Mancino; Warran Wignadasan; Pierre Putzeys; Fares S. Haddad

doi:10.1016/j.arth.2026.04.101

May 1, 2026The Journal of ArthroplastyOpen Access

Comparative Analysis of Relaxed- and Flexed-Seated Radiographs for Assessing Spino-Pelvic Mobility in Total Hip Arthroplasty

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Key Points

This research aims to evaluate the comparative value of radiographic techniques in assessing spino-pelvic mobility in THA patients.
A prospective cohort of 200 patients undergoing primary THA for osteoarthritis was analyzed.
Preoperative lateral radiographs were taken in standing, relaxed-seated, and flexed-seated positions.
Patients were classified using the hip-spine classification based on radiograph measurements.
40.5% of patients were reclassified between seated postures, shifting from mobile to stiff classifications.
Flatback deformity was found in 28.4% of patients, linked to higher stiffness in flexed-seated images.
Sacral slope correlation between relaxed and flexed postures was moderate (r = 0.48).

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Implication

Comparative analysis shows flexed-seated radiographs classify spine mobility differently in hip arthroplasty patients, indicating posture impacts assessment.

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Cite This Study

Fontalis et al. (2026) studied this question.

synapsesocial.com/papers/69fbe3aa164b5133a91a2f83 https://doi.org/10.1016/j.arth.2026.04.101

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Comparative Analysis of Relaxed- and Flexed-Seated Radiographs for Assessing Spino-Pelvic Mobility in Total Hip Arthroplasty

Key Points

No abstract yet

Implication

Discussion

Cite This Study

Comparative Analysis of Relaxed- and Flexed-Seated Radiographs for Assessing Spino-Pelvic Mobility in Total Hip Arthroplasty

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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