title: Comparisons of preoperative three-dimensional planning and surgical reconstruction in primary cementless total hip arthroplasty.
abstract: Reconstruction of important parameters such as femoral offset and torsion is inaccurate, when templating is based on plain x-rays. We evaluate intraoperative reproducibility of pre-operative CT-based 3D-templating in a consecutive series of 50 patients undergoing primary cementless THA through an anterior approach. Pre-operative planning was compared to a postoperative CT scan by image fusion. The implant size was correctly predicted in 100% of the stems, 94% of the cups and 88% of the heads (length). The difference between the planned and the postoperative leg length was 0.3 + 2.3 mm. Values for overall offset, femoral anteversion, cup inclination and anteversion were 1.4 mm ± 3.1, 0.6° ± 3.3°, -0.4° ± 5° and 6.9° ± 11.4°, respectively. This planning allows accurate implant size prediction. Stem position and cup inclination are accurately reproducible.
authors: Department of Orthopaedics Hôpital Orthopédique-Centre Hospitalier Universitaire Vaudois, University of Lausanne, Switzerland.
authors: Hassen
authors: H
authors: Hassani
authors: Department of Orthopaedics Hôpital Orthopédique-Centre Hospitalier Universitaire Vaudois, University of Lausanne, Switzerland.
authors: Stéphane
authors: S
authors: Cherix
authors: Melbourne Orthopaedic Group and Department of Orthopaedic Surgery, Monash University, Dandenong Hospital, Melbourne, Australia.
authors: Eugene T
authors: ET
authors: Ek
authors: Department of Orthopaedics Hôpital Orthopédique-Centre Hospitalier Universitaire Vaudois, University of Lausanne, Switzerland. Electronic address: ortho@mm.st.
authors: Hannes A
authors: HA
authors: Rüdiger
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D007592:Joint Diseases / Q000000981:diagnostic imaging* / Q000601:surgery; D007870:Leg Length Inequality / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed
keywords: 3D templating; anatomical reconstruction; hip reconstruction; preoperative planning; total hip arthroplasty