{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T17:16:14Z","timestamp":1783012574891,"version":"3.54.6"},"reference-count":58,"publisher":"S. Karger AG","issue":"6","license":[{"start":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T00:00:00Z","timestamp":1775606400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T00:00:00Z","timestamp":1775606400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Gerontology"],"abstract":"<jats:p>&lt;p&gt;Introduction: Total hip arthroplasty (THA) effectively alleviates pain and improves quality of life in patients with severe hip osteoarthritis (OA). However, there are limited comprehensive longitudinal data on physical function and objectively measured physical activity (PA) patterns after THA. The purpose of this study was to establish the test-retest reliability of physical fitness measures in patients with hip OA and to evaluate changes in physical fitness and activity over time following THA. Methods: Seventy-eight OA patients (mean age 73.7 \u00b1 4.2 years, 81% women) scheduled for THA underwent comprehensive physical fitness testing and accelerometry-based PA monitoring. Assessments were conducted at two preoperative time points and at 4-month (n = 57) and 1-year postoperative follow-up (n = 48). The test battery included measures of muscle strength, motor fitness, and cardiorespiratory fitness. PA was objectively measured using hip-worn triaxial accelerometers. Self-reported Hip Disability and Osteoarthritis Outcome Score (HOOS) were collected pre- and postoperatively. Results: Good to excellent test-retest reliability was demonstrated across 23 of 24 fitness parameters. At 1-year post-op, significant improvements were observed in 23 of 45 measured parameters, including functional mobility (timed up-and-go: \u221229%), walking distance (Six-Minute Walk Test: +16%), trunk endurance-strength (+71 to 82%), shoulder press (+32%), various leg strength tests (+13 to 42%), 4-m max walking speed (+42%), moderate-to-vigorous physical activity (+63%) and daily step count from 6,004 to 7,558 steps\/day (+26%). Ipsilateral-to-contralateral step height asymmetry decreased from 27% preoperatively to 8% at 1-year follow-up. VO&lt;sub&gt;2peak&lt;\/sub&gt; demonstrated a modest but significant improvement from 22.7 to 23.6 mL\/kg\/min (+4%) 1 year postoperatively. Conclusion: This study revealed low fitness and activity levels in patients with severe hip OA before surgery, with marked improvements in physical fitness and activity measurements 1 year after surgery. The high reliability of the comprehensive assessment battery supports its usefulness for both research and clinical practice. These findings contribute to the existing evidence on simple, field-based fitness tests for patients with hip OA, while also offering methodological insights and recovery trajectories. &lt;\/p&gt;<\/jats:p>","DOI":"10.1159\/000551919","type":"journal-article","created":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T16:01:12Z","timestamp":1775664072000},"page":"419-437","source":"Crossref","is-referenced-by-count":0,"title":["Physical Fitness and Physical Activity Levels One Year after Total Hip Arthroplasty in Older Hip Osteoarthritis Patients: A Longitudinal Observational 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