title: Surgeon error in performing intraoperative estimation of stem anteversion in cementless total hip arthroplasty.
abstract: To examine the accuracy of intraoperative estimation of stem anteversion in total hip arthroplasty (THA), we compared the intraoperatively estimated stem anteversion (estimated prosthetic anteversion) to stem anteversion measured by postoperative computed tomography (true anteversion) in 73 hips in 73 patients. Estimated prosthetic anteversion was significantly greater than true anteversion by 5.8°, and the mean absolute value of surgeon error was 7.3° ranging from 11° underestimation to 25° overestimation. Surgeons tended to overestimate when the true anteversion was smaller. A multivariate analysis showed that advanced knee osteoarthritis significantly increased surgeon error. These results indicated that estimated prosthetic anteversion was generally larger than true anteversion and that the grade of knee osteoarthritis affected the degree of surgeon error.
authors.affiliation: Department of Orthopaedic Surgery, Graduate school of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan.
authors.forename: Masanobu
authors.initials: M
authors.lastname: Hirata
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Masanobu
authors.initials: M
authors.lastname: Ohishi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Hamai
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hara
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D002484:Cementation; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007430:Intraoperative Care; D007592:Joint Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D019300:Medical Errors; D008875:Middle Aged; D011446:Prospective Studies; D014057:Tomography, X-Ray Computed
keywords: computed tomography; femoral anteversion; intraoperative estimation; stem anteversion; total hip arthroplasty