eprintid: 26514 rev_number: 13 eprint_status: archive userid: 1589 dir: disk0/00/02/65/14 datestamp: 2019-08-06 14:25:04 lastmod: 2019-08-22 10:54:48 status_changed: 2019-08-06 14:25:04 type: article metadata_visibility: show creators_name: Innmann, Moritz M. creators_name: Weishorn, Johannes creators_name: Bruckner, Thomas creators_name: Streit, Marcus R. creators_name: Walker, Tilman creators_name: Gotterbarm, Tobias creators_name: Merle, Christian creators_name: Maier, Michael W. title: Fifty-six percent of proximal femoral cortical hypertrophies 6 to 10 years after Total hip arthroplasty with a short Cementless curved hip stem – a cause for concern? subjects: ddc-610 divisions: i-911460 divisions: i-911800 keywords: Cortical, Hypertrophy, Thigh, Pain, Short, Stem, Cementless, Hip, Arthroplasty abstract: Background: Thigh pain and cortical hypertrophies (CH) have been reported in the short term for specific short hip stem designs. The purpose of the study was to investigate 1) the differences in clinical outcome, thigh pain and stem survival for patients with and without CHs and 2) to identify patient and surgery-related factors being associated with the development of CHs. Methods: A consecutive series of 233 patients with 246 hips was included in the present retrospective diagnostic cohort study, who had received a total hip arthroplasty (THA) between December 2007 and 2009 with a cementless, curved, short hip stem (Fitmore, Zimmer, Warsaw, IN, USA). Clinical and radiographic follow-up, including the radiographic parameters for hip geometry reconstruction, were prospectively assessed 1, 3, and 6 to 10 years after surgery. Results: Cortical hypertrophies were observed in 56% of the hips after a mean of 7.7 years, compared to 53% after 3.3 years being mostly located in Gruen zone 3 and 5. There was no significant difference for the Harris Hip Score and UCLA score for patients with and without CHs. Only one patient with a mild CH in Gruen zone 5 and extensive heterotopic ossifications around the neck of the stem reported thigh pain. The Kaplan Meier survival rate after 8.6 years was 99.6% (95%-CI; 97.1–99.9%) for stem revision due to aseptic loosening and no association with CHs could be detected. Postoperative increase in hip offset was the only risk factor being associated with the development of CHs in the regression model (ΔHO; OR 1.1 (1.0–1.2); p = 0.001). Conclusions: The percentage of cortical hypertrophies remained almost constant in the mid-term compared to the short-term with the present cementless short hip stem design. The high percentage of cortical hypertrophies seems not be a cause for concern with this specific implant in the mid-term. Level of evidence: Diagnostic Level IV date: 2019 publisher: BioMed Central id_scheme: DOI ppn_swb: 1671857798 own_urn: urn:nbn:de:bsz:16-heidok-265143 language: eng bibsort: INNMANNMORFIFTYSIXPE2019 full_text_status: public publication: BMC musculoskeletal disorders volume: 20 number: 261 place_of_pub: London pagerange: 1-9 issn: 1471-2474 citation: Innmann, Moritz M. ; Weishorn, Johannes ; Bruckner, Thomas ; Streit, Marcus R. ; Walker, Tilman ; Gotterbarm, Tobias ; Merle, Christian ; Maier, Michael W. (2019) Fifty-six percent of proximal femoral cortical hypertrophies 6 to 10 years after Total hip arthroplasty with a short Cementless curved hip stem – a cause for concern? BMC musculoskeletal disorders, 20 (261). pp. 1-9. ISSN 1471-2474 document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/26514/1/12891_2019_Article_2645.pdf