title: The value of preoperative planning for total hip arthroplasty.
abstract: To analyse the value and accuracy of preoperative planning for total hip replacement (THR) we digitised electronically and compared the hand-sketched preoperative plans with the pre- and postoperative radiographs of 100 consecutive primary THRs. The correct type of prosthesis was planned in 98%; the agreement between planned and actually used components was 92% on the femoral side and 90% on the acetabular side. The mean (+/- SD) absolute difference between the planned and actual position of the centre of rotation of the hip was 2.5 +/- 1.1 mm vertically and 4.4 +/- 2.1 mm horizontally. On average, the inclination of the acetabular component differed by 7 +/- 2 degrees and anteversion by 9 +/- 3 degrees from the preoperative plans. The mean postoperative leg-length difference was 0.3 +/- 0.1 cm clinically and 0.2 +/- 0.1 cm radiologically. More than 80% of intraoperative difficulties were anticipated. Preoperative planning is of significant value for the successful performance of THR.
authors.affiliation: Department of Orthopaedic Surgery, University of Bern, Inselspital, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Eggli
authors.forename: M
authors.initials: M
authors.lastname: Pisan
authors.forename: M E
authors.initials: ME
authors.lastname: Müller
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D000368:Aged; D000886:Anthropometry; D019644:Arthroplasty, Replacement, Hip / Q000379:methods; D003657:Decision Making; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control; D007866:Leg / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D008297:Male; D010347:Patient Care Planning; D011474:Prosthesis Design; D011856:Radiographic Image Enhancement; D012399:Rotation