{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T12:16:31Z","timestamp":1767183391753,"version":"build-2065373602"},"reference-count":27,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2022,8,19]],"date-time":"2022-08-19T00:00:00Z","timestamp":1660867200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Purpose: Prolonged operative time (OT) is associated with adverse complications after total knee arthroplasty (TKA). The purpose of this study was to determine whether preoperative factors, such as sex, age, body mass index, body weight (BW), body height, American Society of Anesthesiologists grade, tibiofemoral angle, hospital for special surgery scores, surgical side, surgical order, and calendar year of surgery, affect OT. Methods: One hundred and nineteen patients (238 knees) with osteoarthritis who underwent staged bilateral primary TKA performed by a single surgeon were evaluated. The medical records of 15 males and 104 females were retrospectively reviewed. All variables were expressed as median (interquartile range). Results: The OT for all TKAs was 57 min (51, 65). The OT on the left side (59 min (52\u201367)) was longer than that on the right side (55 min (50\u201362)) (p = 0.015). Multiple regression analysis revealed that longer OT was related to BW (\u03b2 = 0.488, p &lt; 0.001), calendar year of surgery (\u03b2 = \u22120.218, p&lt; 0.001), and operative side (\u03b2 = \u22120.151, p = 0.007). The Jonckheere\u2013Terpstra test showed a trend toward decreasing OT with calendar year on the left side (p = 0.037) (surgeon\u2019s non-dominant side), but not on the right (p = 0.795). Body height, BW, and body mass index showed weak correlations (r = 0.212, p = 0.001; r = 0.352, p &lt; 0.001; r = 0.290, p &lt; 0.001, respectively) with OT. Conclusion: Patients with a large physique, and especially obesity, with an affected knee on the surgeon\u2019s non-dominant side may require a longer OT; OT decreased over time.<\/jats:p>","DOI":"10.3390\/jcm11164867","type":"journal-article","created":{"date-parts":[[2022,8,21]],"date-time":"2022-08-21T23:51:01Z","timestamp":1661125861000},"page":"4867","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Comparison of Operative Times in Primary Bilateral Total Knee Arthroplasty Performed by a Single Surgeon"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3360-8461","authenticated-orcid":false,"given":"Yoshinori","family":"Ishii","sequence":"first","affiliation":[{"name":"Ishii Orthopaedic & Rehabilitation Clinic, 1089 Shimo-Oshi, Gyoda, Saitama 361-0037, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideo","family":"Noguchi","sequence":"additional","affiliation":[{"name":"Ishii Orthopaedic & Rehabilitation Clinic, 1089 Shimo-Oshi, Gyoda, Saitama 361-0037, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junko","family":"Sato","sequence":"additional","affiliation":[{"name":"Ishii Orthopaedic & Rehabilitation Clinic, 1089 Shimo-Oshi, Gyoda, Saitama 361-0037, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ikuko","family":"Takahashi","sequence":"additional","affiliation":[{"name":"Ishii Orthopaedic & Rehabilitation Clinic, 1089 Shimo-Oshi, Gyoda, Saitama 361-0037, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hana","family":"Ishii","sequence":"additional","affiliation":[{"name":"School of Plastic Surgery, Kanazawa Medical University, 1-1 Daigaku Uchinada, Ishikawa 920-0253, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryo","family":"Ishii","sequence":"additional","affiliation":[{"name":"School of Orthopaedic Surgery, Shinshu University Hospital, 3-1-1 Asahi Matsumoto, Nagano 390-8621, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kei","family":"Ishii","sequence":"additional","affiliation":[{"name":"Iwate Prefectural Ninohe Hospital, 38 Horino, Ninohe, Iwate 028-6193, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shin-ichi","family":"Toyabe","sequence":"additional","affiliation":[{"name":"Niigata University Crisis Management Office, Niigata University Hospital, Niigata University Graduate School of Medical and Dental Sciences, 1 Asahimachi Dori Niigata, Niigata 951-8520, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Badawy, M., Espehaug, B., Fenstad, A.M., Indrekvam, K., Dale, H., Havelin, L.I., and Furnes, O. 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