{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T02:05:21Z","timestamp":1782439521726,"version":"3.54.5"},"reference-count":41,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2025,2,5]],"date-time":"2025-02-05T00:00:00Z","timestamp":1738713600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["European Journal of Sport Science"],"published-print":{"date-parts":[[2025,3]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>The aim of the study was to evaluate conventional ultrasound (US) as a radiation\u2010free alternative to X\u2010ray for determining biological age (BA; indicated by skeletal age). BA, was determined in 24 healthy, male, elite youth soccer goalkeepers around peak height velocity (11\u201316\u00a0years of age) using both X\u2010ray and conventional US scans of the left hand. X\u2010ray scans were evaluated using the Tanner\u2013Whitehouse 2 method. Conventional US scans served to determine BA via ossification ratios of 13 hand and wrist bones. The new conventional US method showed very strong correlation with X\u2010ray <jats:italic>r<\/jats:italic>\u00a0=\u00a00.90 (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05). However, the agreement for the difference in BA and CA, which accounts for age\u2010related variance, was classified poor (ICC\u00a0=\u00a00.48, <jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.05). Additionally, linear regression analysis and the Bland\u2013Altman plot suggested the presence of a systematic and proportional overestimation of BA in younger players and an underestimation of BA in older players. Furthermore, Cohen's kappa showed a moderate agreement between players' classification into maturity groups for the two assessment methods. In conclusion, our study has shown that using US\u2010derived ossification ratios did not deliver valid results compared to X\u2010ray when determining BA in youth soccer goalkeepers.<\/jats:p>","DOI":"10.1002\/ejsc.12264","type":"journal-article","created":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T01:20:56Z","timestamp":1738804856000},"source":"Crossref","is-referenced-by-count":2,"title":["Assessment of Biological Age With Conventional Ultrasound Imaging as an Alternative to X\u2010Ray\u2014A Pilot Study in Youth Soccer"],"prefix":"10.1002","volume":"25","author":[{"given":"Chantal","family":"Widmer","sequence":"first","affiliation":[{"name":"Department for Elite Sport Swiss Federal Institute of Sport Magglingen  Magglingen Switzerland"},{"name":"Department of Health Sciences and Technology ETH Zurich  Zurich Switzerland"},{"name":"Faculty of Science and Medicine University of Fribourg  Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jasmin D.","family":"Busch","sequence":"additional","affiliation":[{"name":"Department of Diagnostic Interventional and Paediatric Radiology Inselspital University of Bern  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1058-4367","authenticated-orcid":false,"given":"Dennis\u2010Peter","family":"Born","sequence":"additional","affiliation":[{"name":"Department for Elite Sport Swiss Federal Institute of Sport Magglingen  Magglingen Switzerland"},{"name":"Section for High\u2010Performance Sports Swiss Swimming Federation  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4139-2955","authenticated-orcid":false,"given":"Michael","family":"Romann","sequence":"additional","affiliation":[{"name":"Department for Elite Sport Swiss Federal Institute of Sport Magglingen  Magglingen Switzerland"},{"name":"Faculty of Science and Medicine University of Fribourg  Fribourg Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jsams.2020.10.003"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tjem.2018.08.001"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1177\/096228029900800204"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600\u20100838.2008.00867.x"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.52082\/jssm.2022.640"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1177\/001316446002000104"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.bspc.2012.02.002"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.5114\/biolsport.2024.127380"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1519\/ssc.0000000000000281"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1136\/bjsm.2009.067439"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/s8756\u20103282(00)00331\u20108"},{"key":"e_1_2_11_13_1","article-title":"A New View of Statistics","author":"Hopkins W. 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