title: A novel method for accurate and reproducible functional cup positioning in total hip arthroplasty.
abstract: Cup positioning is an important variable for short and long term function, stability, and durability of total hip arthroplasty (THA). This novel method utilizes internal and external bony landmarks, and the transverse acetabular ligament for positioning the acetabular component. The cup is placed parallel and superior to the transverse ligament and inside the anterior wall notch of the true acetabulum, then adjusted for femoral version and pelvic tilt and obliquity based on weight bearing radiographs. In 78 consecutive THAs, the mean functional anteversion and abduction angles were 17.9° ± 4.7° and 41.7° ± 3.8°, respectively. 96% of the functional anteversion measurements and 100% of the functional abduction angles were within the safe zone. This technique is an easy, reproducible, and accurate method for functional cup placement.
authors: Hospital for Special Surgery, New York, NY, USA.
authors: Morteza
authors: M
authors: Meftah
authors: Akhilesh
authors: A
authors: Yadav
authors: Anthony C
authors: AC
authors: Wong
authors: Amar S
authors: AS
authors: Ranawat
authors: Chitranjan S
authors: CS
authors: Ranawat
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008023:Ligaments, Articular / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008875:Middle Aged; D056888:Patient Positioning; D010384:Pelvic Bones / Q000000981:diagnostic imaging; D011859:Radiography; D015203:Reproducibility of Results; D012984:Software; D025321:Surgery, Computer-Assisted
keywords: Abduction angle; Acetabular cup positioning; Anteversion; Functional pelvic orientation; Safe zone