{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T07:50:19Z","timestamp":1777881019902,"version":"3.51.4"},"reference-count":23,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2020,5,1]],"date-time":"2020-05-01T00:00:00Z","timestamp":1588291200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Orthop Surg (Hong Kong)"],"published-print":{"date-parts":[[2020,5,1]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Prophylactic pinning of the uninvolved side after unilateral slipped capital femoral epiphysis (SCFE) is controversial as it balances increased surgical risks against the possibility of protecting a normal hip from initial slip and deformity. A posterior sloping angle (PSA) of greater than 12\u201314.5\u00b0 has been proposed by various authors as a treatment threshold to predict for contralateral hip progression and prophylactic pinning.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>A retrospective review of a 10-year series of patients with the diagnosis of SCFE and follow-up of 18 months was conducted. Patients were divided into two groups, those with Isolated Unilateral Slips and those who subsequently underwent Subsequent Contralateral Progression. PSA measurements were performed by two clinicians and assessed for inter-observer reliability. Data collected included age, sex, ethnicity, Loder class, endocrinopathy, renal impairment, radiation exposure, and PSA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>There were no significant differences between the distribution of gender, site of slip, age of onset, Loder class, and presence of medical comorbidities between the Isolated Unilateral Slip and Subsequent Contralateral Progression groups ( p &gt; 0.05). The mean PSA value was not significantly higher in the Subsequent Contralateral Progression group (17.9 \u00b1 4.32 (10.5\u201323.5)) compared to the Isolated Unilateral Slip group (15.8 \u00b1 5.31 (6\u201326)) ( p = 0.32). The receiver operator coefficient-derived ideal treatment threshold of 16.5\u00b0 gave a sensitivity of 0.71, specificity of 0.64, and number needed to treat of 3.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>PSA differences between the Subsequent Contralateral Progression and Isolated Unilateral Slip groups were not statistically significant in this series. All proposed treatment thresholds had poor specificity. Prophylactic pinning should not be based on isolated PSA values.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of evidence:<\/jats:title>\n                    <jats:p>III.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/2309499020937827","type":"journal-article","created":{"date-parts":[[2020,7,14]],"date-time":"2020-07-14T11:07:48Z","timestamp":1594724868000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":6,"title":["Posterior sloping angle of the capital femoral physis in slipped capital femoral epiphysis has poor clinical utility and should not guide treatment on prophylactic fixation"],"prefix":"10.1177","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5983-315X","authenticated-orcid":false,"given":"Youheng","family":"Ou Yang","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, Singapore General Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chloe Xiaoyun","family":"Chan","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, KK Women\u2019s and Children\u2019s Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gloria Hui Min","family":"Cheng","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, KK Women\u2019s and Children\u2019s Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sumanth Kumar","family":"Gera","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, KK Women\u2019s and Children\u2019s Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arjandas","family":"Mahadev","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, KK Women\u2019s and Children\u2019s Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad Ashik bin","family":"Zainuddin","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, KK Women\u2019s and Children\u2019s Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,7,14]]},"reference":[{"key":"bibr1-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/MOP.0b013e328320acea"},{"key":"bibr2-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01.bpo.0000217718.10728.70"},{"key":"bibr3-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01241398-199313050-00011"},{"key":"bibr4-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01241398-199505000-00018"},{"key":"bibr5-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/00004694-199703000-00013"},{"key":"bibr6-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01.blo.0000136655.51838.84"},{"key":"bibr7-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01.bpb.0000271325.33739.86"},{"key":"bibr8-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/BPO.0b013e3181efb888"},{"key":"bibr9-2309499020937827","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.F.01027"},{"key":"bibr10-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01241398-200011000-00009"},{"key":"bibr11-2309499020937827","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-200412000-00011"},{"key":"bibr12-2309499020937827","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-200208000-00004"},{"key":"bibr13-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/bpo.0b013e31814256af"},{"key":"bibr14-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/01.bpo.0000158811.29602.a5"},{"key":"bibr15-2309499020937827","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.L.00365"},{"key":"bibr16-2309499020937827","doi-asserted-by":"publisher","DOI":"10.2307\/2529310"},{"key":"bibr17-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1097\/BPO.0000000000000512"},{"issue":"3","key":"bibr18-2309499020937827","doi-asserted-by":"crossref","first-page":"184","DOI":"10.47102\/annals-acadmedsg.V37N3p184","volume":"37","author":"Lim YJ","year":"2008","journal-title":"Ann Acad Med Singapore"},{"issue":"9","key":"bibr19-2309499020937827","first-page":"215","volume":"77","author":"Fedorak GT","year":"2018","journal-title":"Hawaii J Med Public Health"},{"key":"bibr20-2309499020937827","unstructured":"https:\/\/www.gov.sg\/article\/what-are-the-racial-proportions-among-singapore-citizens, Singapore Government, \u201cWhat are the racial proportions amongst Singapore Citizens\u201d, Published 10 December 2019, Accessed 25th June 2020."},{"key":"bibr21-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1007\/s11832-016-0732-x"},{"key":"bibr22-2309499020937827","unstructured":"Kwiatkowska M, Czubak J, Tyrakowski M, et al. Posterior sloping angle can help in predicting the contralateral slip in patients with primary unilateral slipped capital femoral epiphysis. Presented at the European Society of Radiology, ECR 2014, 6-10th March 2014, Vienna. Scientific Exhibit. DOI: 10.1594\/ecr2014\/C-0225."},{"key":"bibr23-2309499020937827","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.70B2.3346283"}],"container-title":["Journal of Orthopaedic Surgery"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/2309499020937827","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/2309499020937827","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/2309499020937827","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T00:29:51Z","timestamp":1777595391000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/2309499020937827"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,5,1]]},"references-count":23,"journal-issue":{"issue":"2","published-print":{"date-parts":[[2020,5,1]]}},"alternative-id":["10.1177\/2309499020937827"],"URL":"https:\/\/doi.org\/10.1177\/2309499020937827","relation":{},"ISSN":["1022-5536","2309-4990"],"issn-type":[{"value":"1022-5536","type":"print"},{"value":"2309-4990","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,5,1]]},"article-number":"2309499020937827"}}