title: Relationship between radiographic measurements of reconstructed hip joint position and the Trendelenburg sign.
abstract: We evaluated 60 limbs, including 34 primary total hip arthroplasties in 30 patients (mean age, 56 years) at a minimum of 2 years postoperatively. Femoral offset ratio (%FO) was calculated by dividing the femoral offset by the distance between the centers of the bilateral femoral heads on radiographs. The tilt angle of the pelvis by the Trendelenburg test was measured using the magnetic sensor system. In the limbs having a negative Trendelenburg sign after reconstruction, the %FO averaged 20.1% (range, 14.7% to 24.7%), and the tilt angle of the pelvis averaged +0.8 degrees (range, -1.0 degrees to +5.0 degrees ). The tilt angle of the pelvis correlated positively with %FO (P=.0160, r=0.407). The reconstructed hip joint position is crucial to improve hip abductor function.
authors.affiliation: Department of Orthopaedic Surgery, Fukuoka University School of Medicine, Fukuoka, Japan. seikeige@cis.fukuoka-u.ac.jp
authors.forename: Isao
authors.initials: I
authors.lastname: Asayama
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Naito
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Fujisawa
authors.forename: Taichi
authors.initials: T
authors.lastname: Kambe
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D055590:Electromagnetic Phenomena; D005260:Female; D005269:Femur / Q000502:physiology; D005270:Femur Head / Q000000981:diagnostic imaging; D005271:Femur Head Necrosis / Q000503:physiopathology / Q000601:surgery; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology*; D015207:Osteoarthritis, Hip / Q000503:physiopathology / Q000601:surgery; D011184:Postoperative Period; D011859:Radiography; D016896:Treatment Outcome