{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,7]],"date-time":"2026-11-07T20:37:15Z","timestamp":1794083835480,"version":"4.8.0"},"reference-count":24,"publisher":"MJS Publishing, Medical Journals Sweden AB","license":[{"start":{"date-parts":[[2024,7,17]],"date-time":"2024-07-17T00:00:00Z","timestamp":1721174400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ActaO"],"abstract":"<jats:p>Background and purpose: Dislocations continue to be a serious complication after primary total hip arthroplasty (THA). Our primary aim was to report the \u201ctrue\u201d incidence of dislocations in Denmark and secondarily to validate a previously developed algorithm designed to identify THA dislocations in the updated version of the Danish National Patient Register (DNPR), based on data from the Danish Hip Arthroplasty Register (DHR).Methods: We included 5,415 primary THAs from the DHR performed from July 1 to December 31, 2019. Version 3 of the DNPR was launched in February 2019, and a combination of data from the DNPR and a comprehensive national review of 1,762 hospital contacts enabled us to identify every dislocation occurring during the 1st year after THA to determine the \u201ctrue\u201d 1-year incidence of dislocation. The results were presented as proportions with 95% confidence intervals (CI), and validation was performed by calculating sensitivity and predictive values.Results: The \u201ctrue\u201d 1-year incidence of dislocation was 2.8% (CI 2.4\u20133.3). Of these, 37% suffered recurrent dislocations during the follow-up period. Between-hospital variation ranged from 0.0% to 9.6%. The algorithm demonstrated a sensitivity close to 95%, while maintaining a positive predictive value of above 94%.Conclusion:\u00a0The \u201ctrue\u201d 1-year incidence of dislocation of 2.8% is comparable to earlier findings, and large variation among hospitals continues to be evident. We have proven the algorithm to be valid in the latest DNPR (version 3), enabling it to be employed as a new quality indicator in future annual DHR reports.<\/jats:p>","DOI":"10.2340\/17453674.2024.41064","type":"journal-article","created":{"date-parts":[[2024,7,17]],"date-time":"2024-07-17T09:22:19Z","timestamp":1721208139000},"page":"380-385","source":"Crossref","is-referenced-by-count":11,"title":["The \u201ctrue\u201d 1-year incidence of dislocation after primary total hip arthroplasty: validation of an algorithm identifying dislocations in the Danish National Patient Register based on 5,415 patients from the Danish Hip Arthroplasty Register"],"prefix":"10.2340","volume":"95","author":[{"given":"Lars L","family":"Hermansen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas F","family":"Iversen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pernille","family":"Iversen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5169-4282","authenticated-orcid":false,"given":"Bjarke","family":"Viberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6829-4787","authenticated-orcid":false,"given":"S\u00f8ren","family":"Overgaard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1183","published-online":{"date-parts":[[2024,7,17]]},"reference":[{"key":"68717","doi-asserted-by":"crossref","unstructured":"Hermansen L L, Viberg B, Overgaard S. Patient-reported outcome after dislocation of primary total hip arthroplasties: a cross-sectional study derived from the Danish Hip Arthroplasty Register. Acta Orthop 2022; 93: 29-36. 10.1080\/17453674.2021.1983973","DOI":"10.1016\/j.arth.2020.10.004"},{"key":"68718","unstructured":"DHR. Danish Hip Arthroplasty Register\u2014Annual Report. Available from: http:\/\/danskhoftealloplastikregisterdk\/wp-content\/uploads\/2022\/07\/DHR-aarsrapport-2021_Udgivet-2022_offentliggjort-versionpdf 2022"},{"key":"68719","doi-asserted-by":"crossref","unstructured":"Moon J K, Kim Y, Hwang K T, Yang J H, Kim Y H. The incidence of hip dislocation and suture failure according to two different types of posterior soft tissue repair techniques in total hip arthroplasty: a prospective randomized controlled trial. Int Orthop 2018; 42(9): 2049-56. doi: 10.1007\/s00264-018-3884-0","DOI":"10.1007\/s00264-018-3884-0"},{"key":"68720","doi-asserted-by":"crossref","unstructured":"Amado O, Bautista M, Moore J, Bonilla G, Jimenez N, Llinas A. A multimodal approach prevents instability after total hip arthroplasty: a 1 year follow-up prospective study. J Clin Orthop Trauma 2018; 9(2): 137-41. doi: 10.1016\/j.jcot.2016.11.004","DOI":"10.1016\/j.jcot.2016.11.004"},{"key":"68721","doi-asserted-by":"crossref","unstructured":"Jones C W, De Martino I, D\u2019Apolito R, Nocon A A, Sculco P K, Sculco T P. The use of dual-mobility bearings in patients at high risk of dislocation. Bone Joint J 2019; 101-B(1_Supple_A): 41-5. doi: 10.1302\/0301-620X.101B1.BJJ-2018-0506.R1","DOI":"10.1302\/0301-620X.101B1.BJJ-2018-0506.R1"},{"key":"68722","doi-asserted-by":"crossref","unstructured":"Pincus D, Jenkinson R, Paterson M, Leroux T, Ravi B. Association between surgical approach and major surgical complications in patients undergoing total hip arthroplasty. JAMA 2020; 323(11): 1070-6. doi: 10.1001\/jama.2020.0785","DOI":"10.1001\/jama.2020.0785"},{"key":"68723","doi-asserted-by":"crossref","unstructured":"Hermansen L L, Viberg B, Overgaard S. Large hospital variation in the risk of dislocation after primary total hip arthroplasty for primary osteoarthritis: 31,105 patients in 59 hospitals from the Danish Hip Arthroplasty Register. Acta Orthop 2022; 93: 503-8. doi: 10.2340\/17453674.2022.2754","DOI":"10.2340\/17453674.2022.2754"},{"key":"68724","doi-asserted-by":"crossref","unstructured":"Hermansen L L, Viberg B, Hansen L, Overgaard S. \u201cTrue\u201d cumulative incidence of and risk factors for hip dislocation within 2 years after primary total hip arthroplasty due to osteoarthritis: a nationwide population-based study from the Danish Hip Arthroplasty Register. J Bone Joint Surg Am 2021; 103(4): 295-302. doi: 10.2106\/JBJS.19.01352","DOI":"10.2106\/JBJS.19.01352"},{"key":"68725","doi-asserted-by":"crossref","unstructured":"Hermansen L L, Viberg B, Overgaard S. Development of a diagnostic algorithm identifying cases of dislocation after primary total hip arthroplasty-based on 31,762 patients from the Danish Hip Arthroplasty Register. Acta Orthop 2021; 92(2): 137-42. doi: 10.1080\/17453674.2020.1868708","DOI":"10.1080\/17453674.2020.1868708"},{"key":"68726","doi-asserted-by":"crossref","unstructured":"Benchimol E I, Smeeth L, Guttmann A, Harron K, Moher D, Petersen I, et al. The REporting of studies Conducted using Observational Routinely-collected health Data (RECORD) Statement. PLoS Med 2015; 12(10): e1001885. doi: 10.1371\/journal.pmed.1001885.","DOI":"10.1371\/journal.pmed.1001885"},{"key":"68727","doi-asserted-by":"crossref","unstructured":"Ranstam J, Robertsson O. Statistical analysis of arthroplasty register data. 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Hemiarthroplasty versus total hip arthroplasty for femoral neck fracture in elderly patients: twelve-month risk of revision and dislocation in an instrumental variable analysis of Medicare data. J Bone Joint Surg Am 2023; 105(21): 1695-702. doi: 10.2106\/JBJS.23.00247","DOI":"10.2106\/JBJS.23.00247"},{"key":"68737","doi-asserted-by":"crossref","unstructured":"Tohidi M, Mann S M, McIsaac M A, Groome P A. Comparative effectiveness of total hip arthroplasty and hemiarthroplasty for femoral neck fracture: a propensity-score-matched cohort study. J Bone Joint Surg Am 2023; 105(8): 591-9. doi: 10.2106\/JBJS.22.01193","DOI":"10.2106\/JBJS.22.01193"},{"key":"68738","doi-asserted-by":"crossref","unstructured":"HEALTH Investigators; Bhandari M, Einhorn T A, Guyatt G, Schemitsch E H, Zura R D, et al. Total hip arthroplasty or hemiarthroplasty for hip fracture. 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