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The study consists of 68 patients (75 THAs) with a Proxima stem implanted between 2006 and 2015. The clinical results include Harris Hip Scores. Radiological follow-up reports on stem migration, bony trabecular development and radiolucent lines. Kaplan\u2013Meier survival analysis was performed. The mean age of patients was 48.4\u00a0years, with a mean follow-up 114\u00a0months. The average Harris Hip Score improved significantly from 45.1 preoperatively to 97.6 at the final evaluation (<jats:italic>p\u2009&lt;\u2009<\/jats:italic>0.001). Stem migration was observed in five hips (in all of them up to the 6th postoperative month, without any further progression of migration or radiological loosening). Bony trabecular development was detected in modified Gruen zones (1, 2, 4, 6, 7 for Proxima stem): in zone 1 (0%), 2 (49.3.0%), 4 (38.7%), 6 (82.7%), 7 (0%). Radiolucent lines were observed around one cup (DeLee and Charnley zone I) and three stems (none was loose, all three with fibrous stable fixation). Complications were found in three hips (4.0%): intraoperative periprosthetic femoral fracture (threated with cerclage wire) in two hips and squeezing hip in one patient (with perioperative ceramic inlay breakage and exchange). No hip was revised. The implant survival was 100.0% both clinically and radiologically. Observations in the mean follow-up of 114\u00a0months show that the results (clinical and radiological) of the Proxima stem in patients with Crowe type II DDH are promising.<\/jats:p>","DOI":"10.1007\/s00590-024-03844-7","type":"journal-article","created":{"date-parts":[[2024,2,17]],"date-time":"2024-02-17T04:25:54Z","timestamp":1708143954000},"page":"1619-1625","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Mid-term results of total hip arthroplasty with anatomical ultra-short cementless stem in patients with developmental dysplasia of the hip Crowe type II"],"prefix":"10.1007","volume":"34","author":[{"given":"Maros","family":"Hrubina","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Libor","family":"Necas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marian","family":"Melisik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zoltan","family":"Cibula","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Lisy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juraj","family":"Cabala","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jozef","family":"Holjencik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jozef","family":"Cabala","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,2,17]]},"reference":[{"key":"3844_CR1","doi-asserted-by":"publisher","first-page":"40","DOI":"10.1097\/BLO.0b013e3181576052","volume":"465","author":"JNA Argenson","year":"2007","unstructured":"Argenson JNA, Flecher X, Parratte S, Aubaniac JM (2007) Anatomy of the dysplastic hip and consequences for total hip arthroplasty. 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