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The purpose of this study was to retrospectively assess the relationship between discoid lateral meniscus (DLM) types and tear patterns and causes of age\u2010specific clinical symptom onset.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Of 1650 arthroscopic surgeries over a 20\u2010year period, 138 (105 patients) were performed for DLM and were evaluated in this study. The mean age at surgery was 21.5\u2009\u00b1\u200915.8 years. The DLM type was classified by Watanabe\u2019s classification, and tear patterns were classified by the modified Bin\u2019s classification as simple horizontal, complicated horizontal, longitudinal, radial, complex, and no tear. Additionally, patients were divided by age group (&lt;\u200910, 10\u201319, 20\u201339, 40\u201359, and\u2009\u2265\u200960 years) and classified according to the causes of clinical symptom onset as follows: sports activities, minor trauma in daily living, and no traumatic episode.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The DLM was complete in 78 (56.5%) knees and incomplete in 60 (43.5%); no Wrisberg type DLM was observed. Simple horizontal and complicated horizontal tears were significantly more frequent in complete DLM, whereas radial tears and no tears were significantly more frequent in incomplete DLM (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001). When classified by age group, 74 (53.6%) knees with DLMs were found in teenagers. Sports activities caused symptom onset significantly more often in teenagers, no traumatic episode caused symptom onset in patients aged\u2009&lt;\u200910 years, and minor trauma in daily living caused symptom onset in patients aged 40\u201359 years and\u2009\u2265\u200960 years (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001). No relationship was found between the age distribution and tear patterns; however, the absence of tears tended to be more common in teenaged patients, and complicated horizontal tears were more common in patients over 20 years of age.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Symptomatic DLM occurred most often in teenagers. A relationship was identified between the DLM types and tear patterns, which could be helpful in preoperative planning. Causes of clinical symptom onset in patients with DLM were characterised by age group, which might help clinicians to suspect the presence of DLM.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>Level IV.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-021-06635-3","type":"journal-article","created":{"date-parts":[[2021,6,10]],"date-time":"2021-06-10T03:07:21Z","timestamp":1623294441000},"page":"1436-1442","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Symptomatic discoid lateral meniscus shows a relationship between types and tear patterns, and between causes of clinical symptom onset and the age distribution"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2426-3721","authenticated-orcid":false,"given":"Nami","family":"Yamaguchi","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Division of Orthopaedic Surgery, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine University of Miyazaki 5200 Kihara, Kiyotake\u2010cho, Miyazaki\u2010shi 889\u20101692 Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Etsuo","family":"Chosa","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Division of Orthopaedic Surgery, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine University of Miyazaki 5200 Kihara, Kiyotake\u2010cho, Miyazaki\u2010shi 889\u20101692 Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takuya","family":"Tajima","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Division of Orthopaedic Surgery, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine University of Miyazaki 5200 Kihara, Kiyotake\u2010cho, Miyazaki\u2010shi 889\u20101692 Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yudai","family":"Morita","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Division of Orthopaedic Surgery, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine University of Miyazaki 5200 Kihara, Kiyotake\u2010cho, Miyazaki\u2010shi 889\u20101692 Miyazaki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takuji","family":"Yokoe","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Division of Orthopaedic Surgery, Department of Medicine of Sensory and Motor Organs, Faculty of Medicine University of Miyazaki 5200 Kihara, Kiyotake\u2010cho, Miyazaki\u2010shi 889\u20101692 Miyazaki 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December 2020","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"8 June 2021","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"10 June 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 authors declare that they have no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This study was approved by the review board of Faculty of Medicine, University of Miyazaki (No. O-0773). Information regarding the study protocol was disclosed prior to the study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Information regarding the protocol of this study was disclosed at HP of the Faculty of Medicine, University of Miyazaki, and research subjects were provided an opportunity to refuse inclusion in this study. Patients who did not want to take part were not enrolled in this study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}