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In DDH, Japanese surgeons refined reconstructive osteotomies and established surgical strategies for complex primary and high-dislocation THA. Early clinical adoption of highly cross-linked polyethylene and advances in ceramic bearing technology improved implant longevity by reducing wear and osteolysis. Japan also pioneered CT-based navigation for both acetabular and femoral component placement and introduced the functional pelvic plane concept, shifting implant alignment from fixed safe zones toward individualized functional positioning that incorporates stem anteversion and spinopelvic dynamics. These innovations have subsequently expanded to robotic-assisted surgery and advanced three-dimensional reconstruction.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Japan has made substantial contributions to modern hip surgery, from biological joint preservation to precision arthroplasty. This integrated approach\u2014emphasizing anatomical accuracy, biomechanical restoration, and long-term durability\u2014continues to influence contemporary practice and provides a foundation for future advances in robotics, artificial intelligence, and personalized hip reconstruction.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00264-026-06957-2","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T17:50:09Z","timestamp":1784051409000},"page":"2143-2152","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Japan\u2019s contributions to hip joint preservation and reconstruction: from osteonecrosis and developmental dysplasia to precision arthroplasty"],"prefix":"10.1007","volume":"50","author":[{"given":"Masaki","family":"Takao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9352-465X","authenticated-orcid":false,"given":"Wataru","family":"Ando","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Sakai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hidetoshi","family":"Hamada","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keisuke","family":"Uemura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatsuhiko","family":"Kutsuna","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Imagama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nobuhiko","family":"Sugano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,7,14]]},"reference":[{"key":"6957_CR1","doi-asserted-by":"publisher","first-page":"2715","DOI":"10.1007\/s11999-010-1292-x","volume":"468","author":"W Fukushima","year":"2010","unstructured":"Fukushima W, Fujioka M, Kubo T, Tamakoshi A, Nagai M, Hirota Y (2010) Nationwide epidemiologic survey of idiopathic osteonecrosis of the femoral head. 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