Varus malalignment of short femoral stem not associated with post-hip arthroplasty fracture.

Autor: Nishioka ST; Bone & Joint Center, Straub Medical Center, 888 South King Street, Honolulu, HI, 96818, USA., Andrews SN; Bone & Joint Center, Straub Medical Center, 888 South King Street, Honolulu, HI, 96818, USA. samantha.andrews@straub.net.; Department of Surgery, University of Hawai'i, John A. Burns School of Medicine, 1356 Lusitana Street, Honolulu, HI, 96813, USA. samantha.andrews@straub.net., Mathews K; Bone & Joint Center, Straub Medical Center, 888 South King Street, Honolulu, HI, 96818, USA., Nakasone CK; Bone & Joint Center, Straub Medical Center, 888 South King Street, Honolulu, HI, 96818, USA.; Department of Surgery, University of Hawai'i, John A. Burns School of Medicine, 1356 Lusitana Street, Honolulu, HI, 96813, USA.
Jazyk: angličtina
Zdroj: Archives of orthopaedic and trauma surgery [Arch Orthop Trauma Surg] 2022 Nov; Vol. 142 (11), pp. 3533-3538. Date of Electronic Publication: 2021 Nov 30.
DOI: 10.1007/s00402-021-04244-w
Abstrakt: Introduction: Periprosthetic femoral fractures are an increasingly common post-operative complication of total hip arthroplasty (THA). Though varus malalignment is known to increase fracture risk in standard-length femoral stems, varus malalignment is not as well studied in short stems. Therefore, the purpose of this study was to determine if varus malalignment contributes to early periprosthetic fracture risk in a cementless taper-wedged, short femoral stem.
Materials and Methods: This retrospective review included 366 consecutive patients (441 THAs) having undergone THA via anterior approach by a single surgeon between July 2014 and December 2016. All patients received the same short, cementless femoral stem. Femoral component angle was measured on 6-week post-THA weight-bearing radiographs, with malalignment defined as a femoral component angle exceeding 0° ± 3°. Periprosthetic femoral fracture and aseptic loosening occurring within 2 years post-THA were recorded.
Results: The final data analysis included 426 hips with a mean follow-up time of 32.9 ± 10.2 months. Varus and neutral alignment occurred in 84 (19.6%) and 342 (79.9%) of stems, respectively. Three (0.7%) periprosthetic femoral fractures occurred within 2 years, all occurring in patients with neutrally aligned femoral stems. One (0.2%) stem failed due to aseptic loosening and was malaligned.
Conclusion: Despite nearly 20% of stems placed in varus alignment, three of the four early complications occurred in a neutrally aligned stem. Based on these results, forceful intraoperative realignment of a short femoral stem with good initial fixation may present an unnecessary increased risk of intraoperative fracture.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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