{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T06:36:54Z","timestamp":1791959814084,"version":"4.3.4"},"reference-count":30,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T00:00:00Z","timestamp":1726185600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Medicina"],"abstract":"<jats:p>Background and Objectives: Neglected patellar dislocation in the presence of end-stage osteoarthritis (OA) is a rare condition characterized by the patella remaining laterally dislocated without reduction. Due to the scarcity of reported cases, the optimal management approach is still uncertain. However, primary total knee arthroplasty (TKA) can serve as an effective treatment option. This study aimed to present the clinical and radiological outcomes achieved using our surgical technique. Materials and Methods: A retrospective review of 12 knees in 8 patients with neglected patellar dislocation and end-stage OA who underwent primary TKA was conducted. The surgical procedure involved conventional TKA techniques (e.g., medial parapatellar arthrotomy) and additional procedures specific to the individual pathologies of neglected patellar dislocation (e.g., lateral release, medial plication, and quadriceps lengthening). Clinical outcomes, including patient-reported outcome measures (PROMs) (Knee Society Scores and the Western Ontario and McMaster Universities Osteoarthritis Index) and knee range of motion (ROM), were assessed preoperatively and two years postoperatively. Radiological measures including mechanical femorotibial angle and patellar tilt angle were assessed preoperatively and until the last follow-up examinations. Any complications were also reviewed. Results: There were significant improvements in all PROMs, knee ROM, and radiological outcomes, including mechanical femorotibial angle and patellar tilt angle (all p &lt; 0.05). At a mean follow-up of 68 months, no major complications requiring revision surgery, including patellar dislocation, were reported. Conclusions: Primary TKA is an effective procedure for correcting various pathologies associated with neglected patellar dislocation in end-stage OA without necessitating additional bony procedures. Satisfactory clinical and radiological outcomes can be expected using pathology-specific procedures.<\/jats:p>","DOI":"10.3390\/medicina60091492","type":"journal-article","created":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T03:03:37Z","timestamp":1726196617000},"page":"1492","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Primary Total Knee Arthroplasty for Treating Osteoarthritic Knees with Neglected Patellar Dislocation"],"prefix":"10.3390","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1954-9875","authenticated-orcid":false,"given":"Sung Eun","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Orthopedic Surgery, Seoul National University Hospital, Seoul 03080, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seong Hwan","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Chung-Ang University Hospital, Seoul 06973, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jung-In","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Seoul National University Hospital, Seoul 03080, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1229-8863","authenticated-orcid":false,"given":"Hyuk-Soo","family":"Han","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Seoul National University Hospital, Seoul 03080, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Myung Chul","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Seoul National University Hospital, Seoul 03080, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6199-908X","authenticated-orcid":false,"given":"Du Hyun","family":"Ro","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Seoul National University Hospital, Seoul 03080, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"144","DOI":"10.1007\/s11999-011-2123-4","article-title":"Pain relief and functional improvement remain 20 years after knee arthroplasty","volume":"470","author":"Meding","year":"2012","journal-title":"Clin. Orthop. Relat. Res."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"474","DOI":"10.2106\/00004623-200403000-00003","article-title":"Total knee arthroplasty following proximal tibial osteotomy: Risk factors for failure","volume":"86","author":"Parvizi","year":"2004","journal-title":"J. Bone Jt. Surg. Am. Vol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"543","DOI":"10.1016\/j.arth.2006.03.013","article-title":"Total knee arthroplasty in patients with poliomyelitis","volume":"22","author":"Jordan","year":"2007","journal-title":"J. Arthroplast."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"447","DOI":"10.1016\/j.knee.2008.06.004","article-title":"Knee replacement for osteoarthritis secondary to chronic patellar dislocation and trochlear dysplasia","volume":"15","author":"Hau","year":"2008","journal-title":"Knee"},{"key":"ref_5","first-page":"812","article-title":"Congenital dislocation of the patella","volume":"20","author":"Ghanem","year":"2000","journal-title":"Part I Pathol. Anat. J. Pediatr. Orthop."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1016\/S0883-5403(96)80090-8","article-title":"Management of the chronic irreducible patellar dislocation in total knee arthroplasty","volume":"11","author":"Bullek","year":"1996","journal-title":"J. Arthroplast."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"614","DOI":"10.1016\/j.rbo.2015.11.002","article-title":"Total knee arthroplasty with subvastus approach in patient with chronic post-traumatic patellar dislocation","volume":"51","author":"Junqueira","year":"2016","journal-title":"Rev. Bras. Ortop."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2457","DOI":"10.2106\/JBJS.H.00812","article-title":"Proximal patellar quadricepsplasty realignment during total knee arthroplasty for irreducible congenital dislocation of the patella: A report of two cases","volume":"92","author":"Dao","year":"2010","journal-title":"J. Bone Jt. Surg. Am. Vol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1302\/0301-620X.97B10.36920","article-title":"The difficult primary total knee arthroplasty: A review","volume":"97","author":"Baldini","year":"2015","journal-title":"Bone Jt. J."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"129","DOI":"10.1097\/00003086-198801000-00019","article-title":"Total knee arthroplasty in a patient with congenital dislocation of the patella: Case report","volume":"226","author":"Marmor","year":"1988","journal-title":"Clin. Orthop. Relat. Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"384","DOI":"10.1054\/arth.2001.20545","article-title":"Total knee arthroplasty in an adult with con-genital dislocation of the patella","volume":"16","author":"Bergquist","year":"2001","journal-title":"J. Arthroplast."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"422","DOI":"10.1080\/000164701753542113","article-title":"Total knee arthroplasty in bilateral congenital dislocation of the patella--a case report","volume":"72","author":"Pradhan","year":"2001","journal-title":"Acta Orthop. Scand."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/S0968-0160(02)00144-8","article-title":"Total knee arthroplasty for neglected permanent post-traumatic patellar dislocation\u2014Case report","volume":"10","author":"Hudson","year":"2003","journal-title":"Knee"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"254","DOI":"10.1007\/s00167-008-0676-x","article-title":"TKA using the subvastus approach and lateral retinacular release in patients with permanent post-traumatic patellar dislocation: A report of two cases","volume":"17","author":"In","year":"2009","journal-title":"Knee Surg. Sports Traumatol. Arthrosc."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"772","DOI":"10.3928\/01477447-20090818-22","article-title":"Total knee arthroplasty in a patient with neglected congenital patellar dislocation","volume":"32","author":"Tunay","year":"2009","journal-title":"Orthopedics"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"e517","DOI":"10.1016\/j.arth.2010.01.101","article-title":"Total knee arthroplasty combined with medial patellofemoral ligament reconstruction for osteoarthritic knee with preoperative valgus deformity and chronic patellar dislocation","volume":"26","author":"Matsushita","year":"2011","journal-title":"J. Arthroplast."},{"key":"ref_17","first-page":"890315","article-title":"Total knee arthroplasty in a patient with bilateral congenital dislocation of the patella treated with a different method in each knee","volume":"2015","author":"Yamanaka","year":"2015","journal-title":"Case Rep. Orthop."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1016\/j.artd.2016.10.001","article-title":"Total knee arthroplasty for treatment of osteoarthritis with prolonged patellar dislocation","volume":"3","author":"Kumagai","year":"2017","journal-title":"Arthroplast. Today"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1043","DOI":"10.1002\/ca.22894","article-title":"A comparison of three methods of measuring tibial torsion in children with myelomeningocele and normally developing children","volume":"30","author":"Borish","year":"2017","journal-title":"Clin. Anat."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"45","DOI":"10.4055\/cios.2016.8.1.45","article-title":"Radiologic Measurement of Tibial Tuberosity-Trochlear Groove (TT-TG) Distance by Lower Extremity Rotational Profile Computed Tomography in Koreans","volume":"8","author":"Song","year":"2016","journal-title":"Clin. Orthop. Surg."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2380","DOI":"10.1097\/CORR.0000000000000886","article-title":"Classifications in Brief: The Dejour Classification of Trochlear Dysplasia","volume":"477","author":"Kazley","year":"2019","journal-title":"Clin. Orthop. Relat. Res."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"119","DOI":"10.1007\/s11832-008-0090-4","article-title":"Congenital dislocation of the patella","volume":"2","author":"Wada","year":"2008","journal-title":"J. Child. Orthop."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"439","DOI":"10.1016\/j.knee.2017.01.003","article-title":"Femoral component rotations in different gap tensions in total knee arthroplasty: A prospective randomized controlled trial","volume":"24","author":"Kim","year":"2017","journal-title":"Knee"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Kim, J.I., Jang, J., Lee, K.W., Han, H.S., Lee, S., and Lee, M.C. (2017). Anterior tibial curved cortex is a reliable landmark for tibial rotational alignment in total knee arthroplasty. BMC Musculo-Skelet. Disord., 18.","DOI":"10.1186\/s12891-017-1609-y"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"S43","DOI":"10.1016\/j.otsr.2018.04.028","article-title":"Patellar complications after total knee arthroplasty","volume":"105","author":"Putman","year":"2019","journal-title":"Orthop. Traumatol. Surg. Res."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.artd.2021.08.013","article-title":"Knee osteoarthritis with patellar dislocation treated by total knee arthroplasty using a lateral parapatellar approach-ingenuity of exposure and closure","volume":"11","author":"Kubo","year":"2021","journal-title":"Arthroplast. Today"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1097\/01241398-199003000-00025","article-title":"Surgical management of congenital and habitual dislocation of the patella","volume":"10","author":"Gao","year":"1990","journal-title":"J. Pediatr. Orthop."},{"key":"ref_28","first-page":"152","article-title":"Effect of femoral and tibial component position on patellar tracking following total knee arthroplasty: 10-year follow-up of Miller-Galante I knees","volume":"14","author":"Matsuda","year":"2001","journal-title":"Am. J. Knee Surg."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"942","DOI":"10.1054\/arth.2002.34826","article-title":"Factors affecting patellar tracking after total knee arthroplasty","volume":"17","author":"Kawano","year":"2002","journal-title":"J. Arthroplast."},{"key":"ref_30","first-page":"7","article-title":"Evolution of trochlear compartment geometry in total knee arthroplasty","volume":"4","author":"Saffarini","year":"2016","journal-title":"Ann. Transl. Med."}],"container-title":["Medicina"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1648-9144\/60\/9\/1492\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T15:55:16Z","timestamp":1760111716000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1648-9144\/60\/9\/1492"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,9,13]]},"references-count":30,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2024,9]]}},"alternative-id":["medicina60091492"],"URL":"https:\/\/doi.org\/10.3390\/medicina60091492","relation":{},"ISSN":["1648-9144"],"issn-type":[{"value":"1648-9144","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,9,13]]}}}