title: Correlation between the bone mineral density and stress on femur around a Duetto SI stem.
abstract: In cementless stem fixation, BMD reduction around the stem is of concern because it may cause loosening. This BMD reduction is assumed to be caused by stem implantation-induced alteration of the physiological feedback system, which may cause stress shielding and result in loosening, but the causal relationship has not been clarified. In this study, using a Duetto SI stem, we investigated the correlation between the postoperative BMD around the stem and stress. In patients who underwent their first THA at the orthopedic department of our university, the BMD was measured using DEXA, and FEA was performed with an equivalent time course. Time-course changes in the BMD, von Mises stress, and triaxial stress in Gruen zones 1 through 7 were calculated from those measured at 2 weeks and 5 months after surgery. The BMD and von Mises stress showed a bidirectional correlation when Gruen's classification was plotted on the horizontal axis. An increase in stress loaded on bone was assumed to be a factor increasing the BMD. The Duetto SI stem was fixed on the distal side, suggesting its stable fixation. BMD measurement and FEA were useful for quantification of the bone dynamics around the stem from an early phase.
authors.affiliation: Department of Medical Engineering and Technology, School of Allied Health Sciences, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0329, Japan.
authors.forename: Rina
authors.initials: R
authors.lastname: Sakai
authors.affiliation: Department of Orthopaedic Surgery, School of Medicine, Kitasato University, Sagamihara, Kanagawa, Japan.
authors.forename: Takeaki
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: Department of Orthopaedic Surgery, School of Medicine, Kitasato University, Sagamihara, Kanagawa, Japan.
authors.forename: Katsufumi
authors.identifier: 0000-0003-0475-7759
authors.initials: K
authors.lastname: Uchiyama
authors.affiliation: Department of Orthopaedic Surgery, School of Medicine, Kitasato University, Sagamihara, Kanagawa, Japan.
authors.forename: Kentaro
authors.identifier: 0000-0001-5148-914X
authors.initials: K
authors.lastname: Uchida
authors.affiliation: Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Nakao
authors.affiliation: Department of Medical Engineering and Technology, School of Allied Health Sciences, Kitasato University, 1-15-1 Kitasato, Minami Ku, Sagamihara, Kanagawa 252-0329, Japan.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Mabuchi
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D015519:Bone Density / Q000502:physiology*; D005269:Femur; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D013314:Stress, Mechanical
references.citation: Anat Rec A Discov Mol Cell Evol Biol. 2003 Dec;275(2):1081-101
references.pmid: 14613308
references.citation: Arch Orthop Trauma Surg. 1997;116(1-2):60-5
references.pmid: 9006768
references.citation: J Bone Joint Surg Br. 2010 Oct;92(10):1363-9
references.pmid: 20884972
references.citation: J Biomech. 1991;24(1):37-48
references.pmid: 2026632
references.citation: J Orthop Sci. 2005;10(1):32-6
references.pmid: 15666120
references.citation: Skeletal Radiol. 2008 Aug;37(8):723-9
references.pmid: 18478226
references.citation: J Biomech. 2000 Dec;33(12):1655-62
references.pmid: 11006390
references.citation: J Biomech Eng. 2001 Jun;123(3):239-46
references.pmid: 11476367
references.citation: J Bone Miner Res. 1996 Oct;11(10):1526-30
references.pmid: 8889853
references.citation: J Orthop Sci. 2010 Jan;15(1):132-9
references.pmid: 20151263
references.citation: J Bone Joint Surg Am. 2003 Feb;85(2):296-303
references.pmid: 12571308
references.citation: J Orthop Sci. 2008 May;13(3):248-54
references.pmid: 18528659
references.citation: Bone Miner. 1991 Apr;13(1):69-76
references.pmid: 2065219
references.citation: Proc Inst Mech Eng H. 2001;215(2):203-13
references.pmid: 11382079
references.citation: Clin Orthop Relat Res. 1979 Jun;(141):17-27
references.pmid: 477100
references.citation: J Bone Joint Surg Am. 1988 Jan;70(1):45-50
references.pmid: 3335573
references.citation: J Biomech. 2002 Jun;35(6):767-73
references.pmid: 12020996
references.citation: J Bone Joint Surg Br. 1995 May;77(3):479-83
references.pmid: 7744941
references.citation: Clin Orthop Relat Res. 1989 Dec;(249):141-58
references.pmid: 2582665
references.citation: J Biomech. 1987;20(11-12):1135-50
references.pmid: 3429459
references.citation: J Biomed Mater Res. 1994 Nov;28(11):1329-36
references.pmid: 7829563
references.citation: Acta Orthop. 2006 Dec;77(6):877-85
references.pmid: 17260195
references.citation: J Arthroplasty. 1997 Jun;12(4):373-9
references.pmid: 9195312
references.citation: J Bone Joint Surg Br. 1986 May;68(3):392-7
references.pmid: 3733803
references.citation: Clin Biomech (Bristol, Avon). 2002 Jan;17(1):41-8
references.pmid: 11779645