{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T05:06:19Z","timestamp":1768453579802,"version":"3.49.0"},"reference-count":0,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[1998,1,1]],"date-time":"1998-01-01T00:00:00Z","timestamp":883612800000},"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":[[1998,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We performed a retrospective study on 21 patients affected by unilateral spontaneous osteonecrosis of the femoral condyle. Fifteen were women and 6\u00a0men. Their average age was 66.9 years. In ten cases the onset of pain was sudden, with a clear previous history of trauma in two of them. Gait pain, effusion, and joint locking were the most frequent clinical symptoms. At the time of diagnosis, 7 patients presented with grade I necrosis, 8\u00a0grade II, 1\u00a0grade III, and 5\u00a0grade IV, following Koshino\u2019s classification [11]. The average percentage of osteonecrosis was 36.8%. Six patients underwent conservative treatment with physical exercises and nonsteroidal anti\u2010inflammatory drugs. We performed arthroscopy alone in 4 patients, arthroscopy and drilling in 8, valgus high tibial osteotomy in 2, and total knee arthroplasty in 1. The overall results after an average follow\u2010up of 41\u00a0months were excellent and good in 76.2% of the cases, fair in 14.3%, and poor in 9.5%. An associated medial meniscus tear was found in half of the patients who underwent surgery. In patients diagnosed with grade III and IV osteonecrosis, no increase in the percentage of necrosis was observed.<\/jats:p>","DOI":"10.1007\/s001670050065","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T03:30:30Z","timestamp":1030246230000},"page":"12-15","source":"Crossref","is-referenced-by-count":18,"title":["Spontaneous osteonecrosis of the knee"],"prefix":"10.1002","volume":"6","author":[{"given":"J. R.","family":"Valent\u00ed N\u00edn","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopedic Surgery University Clinic of Navarra Av. P\u00edo 12 n. 36 E\u201031008 Pamplona Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M.","family":"Leyes","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopedic Surgery University Clinic of Navarra Av. P\u00edo 12 n. 36 E\u201031008 Pamplona Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"D.","family":"Schweitzer","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopedic Surgery University Clinic of Navarra Av. P\u00edo 12 n. 36 E\u201031008 Pamplona Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[1998,1]]},"container-title":["Knee Surgery, Sports Traumatology, Arthroscopy"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/link.springer.com\/content\/pdf\/10.1007\/s001670050065.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/link.springer.com\/article\/10.1007\/s001670050065\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/esskajournals.onlinelibrary.wiley.com\/doi\/pdf\/10.1007\/s001670050065","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,19]],"date-time":"2025-10-19T10:18:37Z","timestamp":1760869117000},"score":1,"resource":{"primary":{"URL":"https:\/\/esskajournals.onlinelibrary.wiley.com\/doi\/10.1007\/s001670050065"}},"subtitle":["Treatment and evolution"],"short-title":[],"issued":{"date-parts":[[1998,1]]},"references-count":0,"journal-issue":{"issue":"1","published-print":{"date-parts":[[1998,1]]}},"alternative-id":["10.1007\/s001670050065"],"URL":"https:\/\/doi.org\/10.1007\/s001670050065","archive":["Portico"],"relation":{},"ISSN":["0942-2056","1433-7347"],"issn-type":[{"value":"0942-2056","type":"print"},{"value":"1433-7347","type":"electronic"}],"subject":[],"published":{"date-parts":[[1998,1]]}}}