{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,29]],"date-time":"2026-06-29T13:25:51Z","timestamp":1782739551567,"version":"3.54.5"},"reference-count":51,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2021,8,4]],"date-time":"2021-08-04T00:00:00Z","timestamp":1628035200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2021,8,4]],"date-time":"2021-08-04T00:00:00Z","timestamp":1628035200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Universit\u00e4tsklinikum des Saarlandes und Medizinische Fakult\u00e4t der Universit\u00e4t des Saarlandes"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Orthop Traumatol"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Background<\/jats:title>\n                <jats:p>Using the database of the German Cartilage Registry (KnorpelRegister DGOU), this study aims to present patient- and joint-related baseline data in a large cohort of patients with cam-derived femoroacetabular impingement syndrome (FAI) and to detect symptom-determining factors.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Materials and methods<\/jats:title>\n                <jats:p>Requiring cam morphology as the primary pathology, 362 patients were found to be eligible for inclusion in the study. The assessment of preoperative baseline data was performed using the patient-reported outcome measure\u2014International Hip Outcome Tool (iHOT-33). Descriptive statistics were performed to present baseline data. Univariate and multiple regression with post hoc testing were used to identify patient- and joint-related factors that might affect the preoperative iHOT-33 and its subscores, respectively.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The study collective\u2019s mean age was 36.71\u2009\u00b1\u200910.89\u00a0years, with 246 (68%) of them being male. The preoperative mean iHOT-33 total was 46.31\u2009\u00b1\u200920.33 with the subsection \u201csports and recreational activities\u201d presenting the strongest decline (26.49\u2009\u00b1\u200920.68). The parameters \u201cage,\u201d \u201csex,\u201d \u201cbody mass index\u201d (BMI), and the confirmation of \u201cprevious surgery on the affected hip\u201d were identified to statistically affect the preoperative iHOT-33. In fact, a significantly lower mean baseline score was found in patients aged\u2009&gt;\u200940\u00a0years (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), female sex (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001), BMI\u2009\u2265\u200925\u00a0kg\/m<jats:sup>2<\/jats:sup> (<jats:italic>p<\/jats:italic>\u2009=\u20090.002) and in patients with previous surgery on the affected hip (<jats:italic>p<\/jats:italic>\u2009=\u20090.022). In contrast, the parameters defect grade and size, labral tears, and symptom duration delivered no significant results.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>A distinct reduction in the baseline iHOT-33, with mean total scores being more than halved, was revealed. The parameters \u201cage\u2009&gt;\u200940\u00a0years,\u201d \u201cfemale sex,\u201d \u201cBMI\u2009\u2265\u200925,\u201d and confirmation of \u201cprevious surgery on the affected hip\u201d were detected as significantly associated with decreased preoperative iHOT-33 scores. These results help to identify symptom-defining baseline characteristics of cam-derived FAI syndrome.<\/jats:p>\n                <jats:p><jats:italic>Trial registration<\/jats:italic>: The German Cartilage Registry is conducted in accordance with the Declaration of Helsinki and registered at germanctr.de (DRKS00005617). Registered 3 January 2014\u2014retrospectively registered. The registration of data was approved by the local ethics committees of every participating institution. Primary approval was given by the ethics committee at the University of Freiburg (No. 105\/13). <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/www.drks.de\/drks_web\/navigate.do?navigationId=trial.HTML&amp;TRIAL_ID=DRKS00005617\">https:\/\/www.drks.de\/drks_web\/navigate.do?navigationId=trial.HTML&amp;TRIAL_ID=DRKS00005617<\/jats:ext-link><\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s10195-021-00596-6","type":"journal-article","created":{"date-parts":[[2021,8,4]],"date-time":"2021-08-04T12:06:46Z","timestamp":1628078806000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Parameters affecting baseline hip function in patients with cam-derived femoroacetabular impingement syndrome: data analysis from the German Cartilage Registry"],"prefix":"10.1186","volume":"22","clinical-trial-number":[{"clinical-trial-number":"drks00005617","registry":"10.18810\/drks"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5163-2241","authenticated-orcid":false,"given":"Sebastian","family":"Serong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Moritz","family":"Schutzbach","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Fickert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philipp","family":"Niemeyer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Sobau","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gunther","family":"Spahn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wolfgang","family":"Zinser","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Landgraeber","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,8,4]]},"reference":[{"key":"596_CR1","doi-asserted-by":"publisher","first-page":"918","DOI":"10.1136\/annrheumdis-2012-201643","volume":"72","author":"R Agricola","year":"2013","unstructured":"Agricola R, Heijboer MP, Bierma-Zeinstra SMA et\u00a0al (2013) Cam impingement causes osteoarthritis of the hip: a nationwide prospective cohort study (CHECK). Ann Rheum Dis 72:918\u2013923. https:\/\/doi.org\/10.1136\/annrheumdis-2012-201643","journal-title":"Ann Rheum Dis"},{"issue":"Suppl 2","key":"596_CR2","doi-asserted-by":"publisher","first-page":"3","DOI":"10.2106\/JBJS.J.01734","volume":"93","author":"JC Clohisy","year":"2011","unstructured":"Clohisy JC, Dobson MA, Robison JF et\u00a0al (2011) Radiographic structural abnormalities associated with premature, natural hip-joint failure. J Bone Joint Surg Am 93(Suppl 2):3\u20139. https:\/\/doi.org\/10.2106\/JBJS.J.01734","journal-title":"J Bone Joint Surg Am"},{"key":"596_CR3","doi-asserted-by":"publisher","first-page":"3172","DOI":"10.1002\/art.23939","volume":"58","author":"M Doherty","year":"2008","unstructured":"Doherty M, Courtney P, Doherty S et\u00a0al (2008) Nonspherical femoral head shape (pistol grip deformity), neck shaft angle, and risk of hip osteoarthritis: a case-control study. Arthritis Rheum 58:3172\u20133182. https:\/\/doi.org\/10.1002\/art.23939","journal-title":"Arthritis Rheum"},{"key":"596_CR4","doi-asserted-by":"publisher","DOI":"10.1097\/01.blo.0000096804.78689.c2","author":"R Ganz","year":"2003","unstructured":"Ganz R, Parvizi J, Beck M et\u00a0al (2003) Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clin Orthop Relat Res. https:\/\/doi.org\/10.1097\/01.blo.0000096804.78689.c2","journal-title":"Clin Orthop Relat Res"},{"key":"596_CR5","doi-asserted-by":"publisher","first-page":"1099","DOI":"10.1177\/0363546512438381","volume":"40","author":"R Agricola","year":"2012","unstructured":"Agricola R, Bessems JHJM, Ginai AZ et\u00a0al (2012) The development of Cam-type deformity in adolescent and young male soccer players. Am J Sports Med 40:1099\u20131106. https:\/\/doi.org\/10.1177\/0363546512438381","journal-title":"Am J Sports Med"},{"key":"596_CR6","doi-asserted-by":"publisher","first-page":"3229","DOI":"10.1007\/s11999-011-1945-4","volume":"469","author":"KA Siebenrock","year":"2011","unstructured":"Siebenrock KA, Ferner F, Noble PC et\u00a0al (2011) The cam-type deformity of the proximal femur arises in childhood in response to vigorous sporting activity. Clin Orthop Relat Res 469:3229\u20133240. https:\/\/doi.org\/10.1007\/s11999-011-1945-4","journal-title":"Clin Orthop Relat Res"},{"key":"596_CR7","doi-asserted-by":"publisher","first-page":"45","DOI":"10.1136\/bjsm.2005.019026","volume":"40","author":"M L\u2019Hermette","year":"2006","unstructured":"L\u2019Hermette M, Polle G, Tourny-Chollet C et\u00a0al (2006) Hip passive range of motion and frequency of radiographic hip osteoarthritis in former elite handball players. Br J Sports Med 40:45\u201349. https:\/\/doi.org\/10.1136\/bjsm.2005.019026","journal-title":"Br J Sports Med"},{"key":"596_CR8","doi-asserted-by":"publisher","first-page":"34","DOI":"10.1080\/00016470410001708060","volume":"75","author":"H Schmitt","year":"2004","unstructured":"Schmitt H, Brocai DRC, Lukoschek M (2004) High prevalence of hip arthrosis in former elite javelin throwers and high jumpers: 41 athletes examined more than 10 years after retirement from competitive sports. Acta Orthop Scand 75:34\u201339. https:\/\/doi.org\/10.1080\/00016470410001708060","journal-title":"Acta Orthop Scand"},{"key":"596_CR9","doi-asserted-by":"publisher","first-page":"2833","DOI":"10.1177\/0363546514563909","volume":"43","author":"JJ Nepple","year":"2015","unstructured":"Nepple JJ, Vigdorchik JM, Clohisy JC (2015) What is the association between sports participation and the development of proximal femoral cam deformity? A systematic review and meta-analysis. Am J Sports Med 43:2833\u20132840. https:\/\/doi.org\/10.1177\/0363546514563909","journal-title":"Am J Sports Med"},{"key":"596_CR10","doi-asserted-by":"publisher","first-page":"478","DOI":"10.1177\/0363546517697689","volume":"46","author":"WZ Morris","year":"2018","unstructured":"Morris WZ, Li RT, Liu RW et\u00a0al (2018) Origin of cam morphology in femoroacetabular impingement. Am J Sports Med 46:478\u2013486. https:\/\/doi.org\/10.1177\/0363546517697689","journal-title":"Am J Sports Med"},{"key":"596_CR11","doi-asserted-by":"publisher","first-page":"78","DOI":"10.1016\/j.jbiomech.2017.02.007","volume":"55","author":"AD Speirs","year":"2017","unstructured":"Speirs AD, Beaul\u00e9 PE, Huang A et\u00a0al (2017) Properties of the cartilage layer from the cam-type hip impingement deformity. J Biomech 55:78\u201384. https:\/\/doi.org\/10.1016\/j.jbiomech.2017.02.007","journal-title":"J Biomech"},{"key":"596_CR12","doi-asserted-by":"publisher","first-page":"1021","DOI":"10.1097\/CORR.0000000000000649","volume":"477","author":"C Pascual-Garrido","year":"2019","unstructured":"Pascual-Garrido C, Li DJ, Grammatopoulos G et\u00a0al (2019) The pattern of acetabular cartilage wear is hip morphology-dependent and patient demographic-dependent. Clin Orthop Relat Res 477:1021\u20131033. https:\/\/doi.org\/10.1097\/CORR.0000000000000649","journal-title":"Clin Orthop Relat Res"},{"key":"596_CR13","doi-asserted-by":"publisher","first-page":"997","DOI":"10.2106\/JBJS.16.01060","volume":"99","author":"TJ Menge","year":"2017","unstructured":"Menge TJ, Briggs KK, Dornan GJ et\u00a0al (2017) Survivorship and outcomes 10 years following hip arthroscopy for femoroacetabular impingement: labral debridement compared with labral repair. J Bone Joint Surg Am 99:997\u20131004. https:\/\/doi.org\/10.2106\/JBJS.16.01060","journal-title":"J Bone Joint Surg Am"},{"key":"596_CR14","doi-asserted-by":"publisher","first-page":"2882","DOI":"10.1177\/0363546517713731","volume":"45","author":"BG Domb","year":"2017","unstructured":"Domb BG, Yuen LC, Ortiz-Declet V et\u00a0al (2017) Arthroscopic labral base repair in the hip: 5-year minimum clinical outcomes. Am J Sports Med 45:2882\u20132890. https:\/\/doi.org\/10.1177\/0363546517713731","journal-title":"Am J Sports Med"},{"key":"596_CR15","doi-asserted-by":"publisher","DOI":"10.1007\/s12178-019-09559-1","author":"WJ Grantham","year":"2019","unstructured":"Grantham WJ, Philippon MJ (2019) Etiology and pathomechanics of femoroacetabular impingement. Curr Rev Musculoskelet Med. https:\/\/doi.org\/10.1007\/s12178-019-09559-1","journal-title":"Curr Rev Musculoskelet Med"},{"key":"596_CR16","doi-asserted-by":"publisher","first-page":"135","DOI":"10.1016\/j.gaitpost.2019.06.003","volume":"72","author":"DS Catelli","year":"2019","unstructured":"Catelli DS, Ng KCG, Kowalski E et\u00a0al (2019) Modified gait patterns due to cam FAI syndrome remain unchanged after surgery. Gait Posture 72:135\u2013141. https:\/\/doi.org\/10.1016\/j.gaitpost.2019.06.003","journal-title":"Gait Posture"},{"key":"596_CR17","doi-asserted-by":"publisher","first-page":"595","DOI":"10.1016\/j.arthro.2012.03.013","volume":"28","author":"NGH Mohtadi","year":"2012","unstructured":"Mohtadi NGH, Griffin DR, Pedersen ME et\u00a0al (2012) The development and validation of a self-administered quality-of-life outcome measure for young, active patients with symptomatic hip disease: the International Hip Outcome Tool (iHOT-33). Arthroscopy 28:595\u2013605. https:\/\/doi.org\/10.1016\/j.arthro.2012.03.013","journal-title":"Arthroscopy"},{"key":"596_CR18","doi-asserted-by":"publisher","first-page":"83","DOI":"10.1007\/s00402-015-2336-1","volume":"136","author":"F Baumann","year":"2016","unstructured":"Baumann F, Weber J, Zeman F et\u00a0al (2016) Validation of a German version of the International Hip Outcome Tool (G-iHOT33) according to the COSMIN checklist: how much improvement is clinically relevant? Arch Orthop Trauma Surg 136:83\u201391. https:\/\/doi.org\/10.1007\/s00402-015-2336-1","journal-title":"Arch Orthop Trauma Surg"},{"key":"596_CR19","doi-asserted-by":"publisher","first-page":"94","DOI":"10.1016\/j.joca.2016.08.013","volume":"25","author":"DH Li","year":"2017","unstructured":"Li DH, Wang W, Li X et\u00a0al (2017) Development of a valid simplified Chinese version of the International Hip Outcome Tool (SC-iHOT-33) in young patients having total hip arthroplasty. Osteoarthr Cartil 25:94\u201398. https:\/\/doi.org\/10.1016\/j.joca.2016.08.013","journal-title":"Osteoarthr Cartil"},{"key":"596_CR20","doi-asserted-by":"publisher","first-page":"62","DOI":"10.1186\/s12955-015-0255-z","volume":"13","author":"MA Ruiz-Ib\u00e1n","year":"2015","unstructured":"Ruiz-Ib\u00e1n MA, Seijas R, Sallent A et\u00a0al (2015) The international Hip Outcome Tool-33 (iHOT-33): multicenter validation and translation to Spanish. Health Qual Life Outcomes 13:62. https:\/\/doi.org\/10.1186\/s12955-015-0255-z","journal-title":"Health Qual Life Outcomes"},{"key":"596_CR21","doi-asserted-by":"publisher","first-page":"289","DOI":"10.2519\/jospt.2018.7610","volume":"48","author":"M Tijssen","year":"2018","unstructured":"Tijssen M, Tak I, Stubbe J et\u00a0al (2018) Translation, cross-cultural adaptation, and validation of the Dutch International Hip Outcome Tool-33 (iHOT-33 NL) in young, physically active individuals with symptomatic hip joint pathology. J Orthop Sports Phys Ther 48:289\u2013298. https:\/\/doi.org\/10.2519\/jospt.2018.7610","journal-title":"J Orthop Sports Phys Ther"},{"key":"596_CR22","doi-asserted-by":"publisher","first-page":"152","DOI":"10.1093\/jhps\/hnv022","volume":"2","author":"MK Dwyer","year":"2015","unstructured":"Dwyer MK, Green M, McCarthy JC (2015) Assessing outcomes following arthroscopic labral debridement-what can the IHOT-33 reveal? J Hip Preserv Surg 2:152\u2013157. https:\/\/doi.org\/10.1093\/jhps\/hnv022","journal-title":"J Hip Preserv Surg"},{"key":"596_CR23","doi-asserted-by":"publisher","first-page":"232596711984898","DOI":"10.1177\/2325967119848982","volume":"7","author":"OA Sogbein","year":"2019","unstructured":"Sogbein OA, Shah A, Kay J et\u00a0al (2019) Predictors of outcomes after hip arthroscopic surgery for femoroacetabular impingement: a systematic review. Orthop J Sports Med 7:2325967119848982. https:\/\/doi.org\/10.1177\/2325967119848982","journal-title":"Orthop J Sports Med"},{"key":"596_CR24","doi-asserted-by":"publisher","first-page":"2353","DOI":"10.1016\/j.arthro.2018.03.021","volume":"34","author":"JWT Byrd","year":"2018","unstructured":"Byrd JWT, Bardowski EA, Jones KS (2018) Influence of T\u00f6nnis grade on outcomes of arthroscopic management of symptomatic femoroacetabular impingement. Arthroscopy 34:2353\u20132356. https:\/\/doi.org\/10.1016\/j.arthro.2018.03.021","journal-title":"Arthroscopy"},{"key":"596_CR25","doi-asserted-by":"publisher","first-page":"2332","DOI":"10.1007\/s00167-014-3332-7","volume":"24","author":"T Cla\u00dfen","year":"2016","unstructured":"Cla\u00dfen T, K\u00f6rsmeier K, Kamminga M et\u00a0al (2016) Is early treatment of cam-type femoroacetabular impingement the key to avoiding associated full thickness isolated chondral defects? Knee Surg Sports Traumatol Arthrosc 24:2332\u20132337. https:\/\/doi.org\/10.1007\/s00167-014-3332-7","journal-title":"Knee Surg Sports Traumatol Arthrosc"},{"key":"596_CR26","doi-asserted-by":"publisher","first-page":"288","DOI":"10.1177\/0363546517739824","volume":"46","author":"GL Cvetanovich","year":"2018","unstructured":"Cvetanovich GL, Weber AE, Kuhns BD et\u00a0al (2018) Hip arthroscopic surgery for femoroacetabular impingement with capsular management: factors associated with achieving clinically significant outcomes. Am J Sports Med 46:288\u2013296. https:\/\/doi.org\/10.1177\/0363546517739824","journal-title":"Am J Sports Med"},{"key":"596_CR27","doi-asserted-by":"publisher","first-page":"1812","DOI":"10.1016\/j.arthro.2017.04.008","volume":"33","author":"BU Nwachukwu","year":"2017","unstructured":"Nwachukwu BU, Chang B, Kahlenberg CA et\u00a0al (2017) Arthroscopic treatment of femoroacetabular impingement in adolescents provides clinically significant outcome improvement. Arthroscopy 33:1812\u20131818. https:\/\/doi.org\/10.1016\/j.arthro.2017.04.008","journal-title":"Arthroscopy"},{"key":"596_CR28","doi-asserted-by":"publisher","first-page":"612","DOI":"10.1177\/0363546516669325","volume":"45","author":"BU Nwachukwu","year":"2017","unstructured":"Nwachukwu BU, Fields K, Chang B et\u00a0al (2017) Preoperative outcome scores are predictive of achieving the minimal clinically important difference after arthroscopic treatment of femoroacetabular impingement. Am J Sports Med 45:612\u2013619. https:\/\/doi.org\/10.1177\/0363546516669325","journal-title":"Am J Sports Med"},{"key":"596_CR29","doi-asserted-by":"publisher","first-page":"2225","DOI":"10.1016\/S0140-6736(18)31202-9","volume":"391","author":"DR Griffin","year":"2018","unstructured":"Griffin DR, Dickenson EJ, Wall PDH et\u00a0al (2018) Hip arthroscopy versus best conservative care for the treatment of femoroacetabular impingement syndrome (UK FASHIoN): a multicentre randomised controlled trial. The Lancet 391:2225\u20132235. https:\/\/doi.org\/10.1016\/S0140-6736(18)31202-9","journal-title":"The Lancet"},{"key":"596_CR30","doi-asserted-by":"publisher","first-page":"l185","DOI":"10.1136\/bmj.l185","volume":"364","author":"AJR Palmer","year":"2019","unstructured":"Palmer AJR, Ayyar Gupta V, Fernquest S et al (2019) Arthroscopic hip surgery compared with physiotherapy and activity modification for the treatment of symptomatic\u00a0femoroacetabular impingement: multicentre randomised controlled trial. BMJ 364:l185. https:\/\/doi.org\/10.1136\/bmj.l185","journal-title":"BMJ"},{"key":"596_CR31","doi-asserted-by":"publisher","first-page":"3024","DOI":"10.1016\/j.arthro.2018.06.049","volume":"34","author":"S Maxwell","year":"2018","unstructured":"Maxwell S, Pergaminelis N, Renouf J et\u00a0al (2018) Identification of a Patient Acceptable Symptomatic State Score for the International Hip Outcome Tool in people undergoing hip arthroscopy. Arthroscopy 34:3024\u20133029. https:\/\/doi.org\/10.1016\/j.arthro.2018.06.049","journal-title":"Arthroscopy"},{"key":"596_CR32","doi-asserted-by":"publisher","first-page":"5","DOI":"10.1186\/s12891-019-3026-x","volume":"21","author":"PG Robinson","year":"2020","unstructured":"Robinson PG, Maempel JF, Rankin CS et\u00a0al (2020) Evaluation of the patient acceptable symptom state following hip arthroscopy using the 12 item international hip outcome tool. BMC Musculoskelet Disord 21:5. https:\/\/doi.org\/10.1186\/s12891-019-3026-x","journal-title":"BMC Musculoskelet Disord"},{"key":"596_CR33","doi-asserted-by":"publisher","first-page":"M235","DOI":"10.1093\/gerona\/53a.3.m235","volume":"53","author":"FC Bijnen","year":"1998","unstructured":"Bijnen FC, Feskens EJ, Caspersen CJ et\u00a0al (1998) Age, period, and cohort effects on physical activity among elderly men during 10 years of follow-up: the Zutphen Elderly Study. J Gerontol A Biol Sci Med Sci 53:M235\u2013M241. https:\/\/doi.org\/10.1093\/gerona\/53a.3.m235","journal-title":"J Gerontol A Biol Sci Med Sci"},{"key":"596_CR34","doi-asserted-by":"publisher","first-page":"247","DOI":"10.1016\/S0140-6736(12)60646-1","volume":"380","author":"PC Hallal","year":"2012","unstructured":"Hallal PC, Andersen LB, Bull FC et\u00a0al (2012) Global physical activity levels: surveillance progress, pitfalls, and prospects. Lancet 380:247\u2013257. https:\/\/doi.org\/10.1016\/S0140-6736(12)60646-1","journal-title":"Lancet"},{"key":"596_CR35","doi-asserted-by":"publisher","first-page":"798","DOI":"10.1177\/0363546514524364","volume":"42","author":"R Agricola","year":"2014","unstructured":"Agricola R, Heijboer MP, Ginai AZ et\u00a0al (2014) A cam deformity is gradually acquired during skeletal maturation in adolescent and young male soccer players: a prospective study with minimum 2-year follow-up. Am J Sports Med 42:798\u2013806. https:\/\/doi.org\/10.1177\/0363546514524364","journal-title":"Am J Sports Med"},{"key":"596_CR36","doi-asserted-by":"publisher","first-page":"601","DOI":"10.1136\/bjsports-2017-097626","volume":"52","author":"A Palmer","year":"2018","unstructured":"Palmer A, Fernquest S, Gimpel M et\u00a0al (2018) Physical activity during adolescence and the development of cam morphology: a cross-sectional cohort study of 210 individuals. Br J Sports Med 52:601\u2013610. https:\/\/doi.org\/10.1136\/bjsports-2017-097626","journal-title":"Br J Sports Med"},{"key":"596_CR37","doi-asserted-by":"publisher","first-page":"401","DOI":"10.1016\/j.ypmed.2007.07.017","volume":"45","author":"R Bize","year":"2007","unstructured":"Bize R, Johnson JA, Plotnikoff RC (2007) Physical activity level and health-related quality of life in the general adult population: a systematic review. Prev Med 45:401\u2013415. https:\/\/doi.org\/10.1016\/j.ypmed.2007.07.017","journal-title":"Prev Med"},{"key":"596_CR38","doi-asserted-by":"publisher","first-page":"398","DOI":"10.1016\/j.arthro.2013.12.010","volume":"30","author":"DH Nawabi","year":"2014","unstructured":"Nawabi DH, Bedi A, Tibor LM et\u00a0al (2014) The demographic characteristics of high-level and recreational athletes undergoing hip arthroscopy for femoroacetabular impingement: a sports-specific analysis. Arthroscopy 30:398\u2013405. https:\/\/doi.org\/10.1016\/j.arthro.2013.12.010","journal-title":"Arthroscopy"},{"key":"596_CR39","doi-asserted-by":"publisher","first-page":"1487","DOI":"10.1177\/0363546513500766","volume":"42","author":"E Saadat","year":"2014","unstructured":"Saadat E, Martin SD, Thornhill TS et\u00a0al (2014) Factors associated with the failure of surgical treatment for femoroacetabular impingement: review of the literature. Am J Sports Med 42:1487\u20131495. https:\/\/doi.org\/10.1177\/0363546513500766","journal-title":"Am J Sports Med"},{"key":"596_CR40","doi-asserted-by":"publisher","first-page":"488","DOI":"10.1177\/0363546517749475","volume":"47","author":"AA Minkara","year":"2019","unstructured":"Minkara AA, Westermann RW, Rosneck J et\u00a0al (2019) Systematic review and meta-analysis of outcomes after hip arthroscopy in femoroacetabular impingement. Am J Sports Med 47:488\u2013500. https:\/\/doi.org\/10.1177\/0363546517749475","journal-title":"Am J Sports Med"},{"key":"596_CR41","doi-asserted-by":"publisher","first-page":"2303","DOI":"10.1177\/0363546517705617","volume":"45","author":"BM Saltzman","year":"2017","unstructured":"Saltzman BM, Kuhns BD, Basques B et\u00a0al (2017) The influence of body mass index on outcomes after hip arthroscopic surgery with capsular plication for the treatment of femoroacetabular impingement. Am J Sports Med 45:2303\u20132311. https:\/\/doi.org\/10.1177\/0363546517705617","journal-title":"Am J Sports Med"},{"key":"596_CR42","doi-asserted-by":"publisher","first-page":"232596711986007","DOI":"10.1177\/2325967119860079","volume":"7","author":"BU Nwachukwu","year":"2019","unstructured":"Nwachukwu BU, Beck EC, Chapman R et\u00a0al (2019) Preoperative performance of the PROMIS in patients undergoing hip arthroscopic surgery for femoroacetabular impingement syndrome. Orthop J Sports Med 7:2325967119860079. https:\/\/doi.org\/10.1177\/2325967119860079","journal-title":"Orthop J Sports Med"},{"key":"596_CR43","doi-asserted-by":"publisher","first-page":"700","DOI":"10.1016\/j.bbrc.2004.12.041","volume":"328","author":"JL Carrington","year":"2005","unstructured":"Carrington JL (2005) Aging bone and cartilage: cross-cutting issues. Biochem Biophys Res Commun 328:700\u2013708. https:\/\/doi.org\/10.1016\/j.bbrc.2004.12.041","journal-title":"Biochem Biophys Res Commun"},{"key":"596_CR44","doi-asserted-by":"publisher","first-page":"106","DOI":"10.1016\/j.arr.2007.10.001","volume":"7","author":"PM van der Kraan","year":"2008","unstructured":"van der Kraan PM, van den Berg WB (2008) Osteoarthritis in the context of ageing and evolution. Loss of chondrocyte differentiation block during ageing. Ageing Res Rev 7:106\u2013113. https:\/\/doi.org\/10.1016\/j.arr.2007.10.001","journal-title":"Ageing Res Rev"},{"key":"596_CR45","doi-asserted-by":"publisher","first-page":"37","DOI":"10.1093\/jhps\/hnv076","volume":"3","author":"NH Bech","year":"2016","unstructured":"Bech NH, Kodde IF, Dusseldorp F et\u00a0al (2016) Hip arthroscopy in obese, a successful combination? J Hip Preserv Surg 3:37\u201342. https:\/\/doi.org\/10.1093\/jhps\/hnv076","journal-title":"J Hip Preserv Surg"},{"key":"596_CR46","doi-asserted-by":"publisher","first-page":"57","DOI":"10.1016\/j.arthro.2014.07.013","volume":"31","author":"JA Collins","year":"2015","unstructured":"Collins JA, Beutel BG, Garofolo G et\u00a0al (2015) Correlation of obesity with patient-reported outcomes and complications after hip arthroscopy. Arthroscopy 31:57\u201362. https:\/\/doi.org\/10.1016\/j.arthro.2014.07.013","journal-title":"Arthroscopy"},{"key":"596_CR47","doi-asserted-by":"publisher","first-page":"965","DOI":"10.1177\/0363546514565089","volume":"43","author":"A Gupta","year":"2015","unstructured":"Gupta A, Redmond JM, Hammarstedt JE et\u00a0al (2015) Does obesity affect outcomes in hip arthroscopy? A matched-pair controlled study with minimum 2-year follow-up. Am J Sports Med 43:965\u2013971. https:\/\/doi.org\/10.1177\/0363546514565089","journal-title":"Am J Sports Med"},{"key":"596_CR48","doi-asserted-by":"publisher","first-page":"16","DOI":"10.2106\/JBJS.N.00625","volume":"97","author":"A Gupta","year":"2015","unstructured":"Gupta A, Redmond JM, Hammarstedt JE et\u00a0al (2015) Does obesity affect outcomes after hip arthroscopy? A cohort analysis. J Bone Joint Surg Am 97:16\u201323. https:\/\/doi.org\/10.2106\/JBJS.N.00625","journal-title":"J Bone Joint Surg Am"},{"key":"596_CR49","doi-asserted-by":"publisher","DOI":"10.1016\/j.arthro.2019.08.032","author":"KN Kunze","year":"2019","unstructured":"Kunze KN, Nwachukwu BU, Beck EC et\u00a0al (2019) Preoperative duration of symptoms is associated with outcomes 5 years after hip arthroscopy for femoroacetabular impingement syndrome. Arthroscopy. https:\/\/doi.org\/10.1016\/j.arthro.2019.08.032","journal-title":"Arthroscopy"},{"key":"596_CR50","doi-asserted-by":"publisher","first-page":"e122","DOI":"10.2196\/resprot.5895","volume":"5","author":"J Maurer","year":"2016","unstructured":"Maurer J, Grotejohann B, Jenkner C et al (2016) A registry for evaluation of efficiency and safety of surgical treatment of cartilage defects: the German Cartilage Registryn(KnorpelRegister DGOU). JMIR Res Protoc 5:e122. https:\/\/doi.org\/10.2196\/resprot.5895","journal-title":"JMIR Res Protoc"},{"key":"596_CR51","doi-asserted-by":"publisher","first-page":"465","DOI":"10.5301\/hipint.5000141","volume":"24","author":"MA Imam","year":"2014","unstructured":"Imam MA, Barke S, Stafford GH et\u00a0al (2014) Loss to follow-up after total hip replacement: a source of bias in patient reported outcome measures and registry datasets? Hip Int 24:465\u2013472. https:\/\/doi.org\/10.5301\/hipint.5000141","journal-title":"Hip Int"}],"container-title":["Journal of Orthopaedics and Traumatology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s10195-021-00596-6.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/article\/10.1186\/s10195-021-00596-6\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s10195-021-00596-6.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,8,10]],"date-time":"2021-08-10T10:17:34Z","timestamp":1628590654000},"score":1,"resource":{"primary":{"URL":"https:\/\/jorthoptraumatol.springeropen.com\/articles\/10.1186\/s10195-021-00596-6"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,8,4]]},"references-count":51,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2021,12]]}},"alternative-id":["596"],"URL":"https:\/\/doi.org\/10.1186\/s10195-021-00596-6","relation":{},"ISSN":["1590-9921","1590-9999"],"issn-type":[{"value":"1590-9921","type":"print"},{"value":"1590-9999","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,8,4]]},"assertion":[{"value":"17 April 2021","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"25 July 2021","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"4 August 2021","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The German Cartilage Registry is conducted in accordance with the Declaration of Helsinki and registered at germanctr.de (DRKS00005617). The registration of data was approved by the local ethics committees of every participating institution. Primary approval was given by the ethics committee at the University of Freiburg (No. 105\/13). Informed consent was obtained from all patients enrolled in this study.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Written informed consent for publication was obtained.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that there is no conflict of interest.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"32"}}