{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T12:38:19Z","timestamp":1782477499595,"version":"3.54.5"},"reference-count":35,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2010,1,29]],"date-time":"2010-01-29T00:00:00Z","timestamp":1264723200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2010,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The purposes of this study were to report clinical features of the developmental anomaly of ossification type bipartite or tripartite patella using a large series and to propose a new classification for the developmental anomaly of ossification type bipartite or tripartite patella. The first author prospectively examined 111 patients with symptomatic or asymptomatic bipartite (131\u00a0knees) or tripartite (8\u00a0knees) patellae. Eighty\u2010six (77%) were male and 25 (23%) were female. Forty\u2010three patients (39%) showed right knee involvement and 40 (36%) showed left, while 28 (25%) showed involvement in both knees. Forty\u2010six bipartite and 4 tripartite patellae (36%) were symptomatic and 85 bipartite and 4 tripartite patellae (64%) were asymptomatic at initial examination. The median age at onset of pain of symptomatic patients (50\u00a0knees) was 15.6 \u00b1 8.1 years (range, 10\u201351 years). The most common symptom was pain at the separated fragments during or after strenuous activity in all 50\u00a0knees. Physical examination revealed localized tenderness over the separated fragments in all 50\u00a0knees. Bipartite or tripartite patellae were classified by evaluating location and number of fragments. One hundred fifteen knees (83%) were classified as supero\u2010lateral bipartite type, 16 (12%) were lateral bipartite type, 6 (4%) were supero\u2010lateral and lateral tripartite type, and 2 (1%) were supero\u2010lateral tripartite type. For the developmental anomaly of ossification type bipartite or tripartite patella, a classification based on both location and number of fragments is simple and easy to understand and applicable to all types of bipartite or tripartite patella.<\/jats:p>","DOI":"10.1007\/s00167-010-1047-y","type":"journal-article","created":{"date-parts":[[2010,1,28]],"date-time":"2010-01-28T08:45:55Z","timestamp":1264668355000},"page":"1465-1469","source":"Crossref","is-referenced-by-count":77,"title":["Clinical features and classification of bipartite or tripartite patella"],"prefix":"10.1002","volume":"18","author":[{"given":"Yoshikazu","family":"Oohashi","sequence":"first","affiliation":[{"name":"Oohashi Orthopaedic Clinic 38\u201020, Ninomiya\u20103\u2010choume 910\u20100015 Fukui\u2010City Fukui\u2010Ken Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tomihisa","family":"Koshino","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery School of Medicine Yokohama City University Yokohama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoshinori","family":"Oohashi","sequence":"additional","affiliation":[{"name":"Oohashi Orthopaedic Clinic 38\u201020, Ninomiya\u20103\u2010choume 910\u20100015 Fukui\u2010City Fukui\u2010Ken Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2010,1,29]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1053\/jars.2002.30645"},{"key":"e_1_2_6_3_1","first-page":"601","article-title":"A developmental anomaly of the patella frequently diagnosed as fracture","volume":"41","author":"Adams JD","year":"1925","journal-title":"Surg Gynecol Obstet"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1097\/01241398-199001000-00013"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1053\/jars.2003.50055"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/0020\u20101383(89)90128\u20109"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.knee.2006.09.001"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/bjs.1800228717"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1097\/00003086\u2010197507000\u201000025"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01916049"},{"key":"e_1_2_6_11_1","doi-asserted-by":"crossref","first-page":"180","DOI":"10.1097\/00003086-197807000-00026","article-title":"Painful medial bipartite patellae. 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