PURPOSE: The use of screws can enhance immediate cup fixation, but the influence of screw insertion on cup position has not previously been measured. The purpose of this study was to quantitatively evaluate the effect of intra-operative screw fixation on acetabular component alignment that has been inserted with the use of a navigation system. METHODS: We used a navigation system to measure cup alignment at the time of press-fit and after screw fixation in 144 hips undergoing total hip arthroplasty. We also compared those findings with factors measured from postoperative radiographs. RESULTS: The mean intra-operative change of cup position was 1.78° for inclination and 1.81° for anteversion. The intra-operative change of anteversion correlated with the number of screws. The intra-operative change of inclination also correlated with medial hip centre. CONCLUSION: The insertion of screws can induce changes in cup alignment, especially when multiple screws are used or if a more medial hip centre is required for rigid acetabular fixation.
PURPOSE: The use of screws can enhance immediate cup fixation, but the influence of screw insertion on cup position has not previously been measured. The purpose of this study was to quantitatively evaluate the effect of intra-operative screw fixation on acetabular component alignment that has been inserted with the use of a navigation system. METHODS: We used a navigation system to measure cup alignment at the time of press-fit and after screw fixation in 144 hips undergoing total hip arthroplasty. We also compared those findings with factors measured from postoperative radiographs. RESULTS: The mean intra-operative change of cup position was 1.78° for inclination and 1.81° for anteversion. The intra-operative change of anteversion correlated with the number of screws. The intra-operative change of inclination also correlated with medial hip centre. CONCLUSION: The insertion of screws can induce changes in cup alignment, especially when multiple screws are used or if a more medial hip centre is required for rigid acetabular fixation.
Authors: Jui-Ting Hsu; Chih-Han Chang; Kai-Nan An; Mark E Zobitz; Rapin Phimolsarnti; Ronald R Hugate; Kuo-An Lai Journal: Int Orthop Date: 2006-09-01 Impact factor: 3.075
Authors: Ronald R Hugate; Ian D Dickey; Qingshan Chen; Christina M Wood; Franklin H Sim; Michael G Rock Journal: J Arthroplasty Date: 2008-07-17 Impact factor: 4.757
Authors: R Michael Meneghini; Allison D Stultz; Jill S Watson; Mary Ziemba-Davis; Christine A Buckley Journal: J Arthroplasty Date: 2009-08-12 Impact factor: 4.757
Authors: Antonio Murcia-Asensio; Francisco Ferrero-Manzanal; Pablo Sanz-Ruiz; Hermenegildo Cañada-Oya; Raquel Lax-Pérez; Christian Goetze Journal: Case Rep Orthop Date: 2022-06-06