{
    "abstract": "In obese patients, malpositioning of the acetabular cup increases the risk of dislocation in total hip arthroplasty (THA). The aim of this study was to determine whether obesity affects the accuracy of acetabular cup positioning using a computed tomography (CT)-based navigation system.\nWe retrospectively evaluated 226 consecutive patients who underwent cementless primary THAs assisted by the CT-based hip navigation system. We divided the patients into three groups according to body mass index (BMI) and examined the difference between preoperative planning and postoperative implantation angles from CT data.\nThere was no significant correlation between BMI and both inclination and anteversion differences (R\u00a0=\u00a00.028 and R\u00a0=\u00a00.045, respectively). There were no significant differences among the BMI\u00a0<\u00a025, 25\u00a0\u2266\u00a0BMI\u00a0<\u00a030, and BMI\u00a0\u2267\u00a030 groups (p value: 0.725, 0.934, respectively); between the BMI\u00a0<\u00a025 and BMI\u00a0\u2267\u00a025 groups (p value: 0.542, 0.697, respectively); and between the BMI\u00a0<\u00a030 and BMI\u00a0\u2267\u00a030 groups with regard to inclination and anteversion (p value: 0.859, 0.456, respectively). Moreover, similar findings were observed with regard to the distance between the preoperative planning and postoperative cup positioning for the transverse, anteroposterior, and craniocaudal axes of the pelvis.\nWe found that the accuracy of acetabular cup placement using CT based-navigation in THA was not affected in obese patients. Therefore, THAs with a CT-based navigation system are considered useful in obese patients.",
    "authors": [
        {
            "affiliation": "Division of Comprehensive Geriatrics in Community, Niigata University Graduate School of Medical and Dental Sciences, Niigata, 9518520, Japan. Electronic address: imainorio2001@yahoo.co.jp.",
            "firstname": "Norio",
            "initials": "N",
            "lastname": "Imai"
        },
        {
            "affiliation": "Department of Orthopedic Surgery, Tachikawa General Hospital, Nagaoka, 9408621, Japan.",
            "firstname": "Ryota",
            "initials": "R",
            "lastname": "Takubo"
        },
        {
            "affiliation": "Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, 9518520, Japan.",
            "firstname": "Hayato",
            "initials": "H",
            "lastname": "Suzuki"
        },
        {
            "affiliation": "Department of Orthopedic Surgery, Tachikawa General Hospital, Nagaoka, 9408621, Japan.",
            "firstname": "Hayato",
            "initials": "H",
            "lastname": "Shimada"
        },
        {
            "affiliation": "Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, 9518520, Japan.",
            "firstname": "Dai",
            "initials": "D",
            "lastname": "Miyasaka"
        },
        {
            "affiliation": "Division of Advanced Materials Science and Technology, Niigata University Graduate School of Science and Technology, Niigata, 9502181, Japan.",
            "firstname": "Kazuki",
            "initials": "K",
            "lastname": "Tsuchiya"
        },
        {
            "affiliation": "Division of Orthopedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata, 9518520, Japan.",
            "firstname": "Naoto",
            "initials": "N",
            "lastname": "Endo"
        }
    ],
    "conclusions": "We found that the accuracy of acetabular cup placement using CT based-navigation in THA was not affected in obese patients. Therefore, THAs with a CT-based navigation system are considered useful in obese patients.",
    "copyrights": "Copyright \u00a9 2018 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.",
    "doi": "10.1016/j.jos.2018.11.007",
    "journal": "Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association",
    "keywords": [],
    "methods": null,
    "publication_date": "2018-12-14",
    "pubmed_id": "30522927",
    "results": "There was no significant correlation between BMI and both inclination and anteversion differences (R\u00a0=\u00a00.028 and R\u00a0=\u00a00.045, respectively). There were no significant differences among the BMI\u00a0<\u00a025, 25\u00a0\u2266\u00a0BMI\u00a0<\u00a030, and BMI\u00a0\u2267\u00a030 groups (p value: 0.725, 0.934, respectively); between the BMI\u00a0<\u00a025 and BMI\u00a0\u2267\u00a025 groups (p value: 0.542, 0.697, respectively); and between the BMI\u00a0<\u00a030 and BMI\u00a0\u2267\u00a030 groups with regard to inclination and anteversion (p value: 0.859, 0.456, respectively). Moreover, similar findings were observed with regard to the distance between the preoperative planning and postoperative cup positioning for the transverse, anteroposterior, and craniocaudal axes of the pelvis.",
    "title": "Accuracy of acetabular cup placement using CT-based navigation in total hip arthroplasty: Comparison between obese and non-obese patients.",
    "xml": "<Element 'PubmedArticle' at 0x7885021ca1b0>"
}