title: Stresses in cement mantles of hip replacements: effect of femoral implant sizes, body mass index and bone quality.
abstract: The effects of femoral prosthetic heads of diameters 22 and 28 mm were investigated on the stability of reconstructed hemi-pelves with cement mantles of thicknesses 1-4 mm and different bone qualities. Materialise medical imaging package and I-Deas finite element (FE) software were used to create accurate geometry of a hemi-pelvis from CT-scan images. Our FE results show an increase in cement mantle stresses associated with the larger femoral head. When a 22 mm femoral head is used on acetabulae of diameters 56 mm and above, the probability of survivorship can be increased by creating a cement mantle of at least 1 mm thick. However, when a 28 mm femoral head is used, a cement mantle thickness of at least 4 mm is needed. Poor bone quality resulted in an average 45% increase in the tensile stresses of the cement mantles, indicating resulting poor survivorship rate.
authors.affiliation: Faculty of Science and Technology, Anglia Ruskin University, Essex, UK.
authors.forename: J-M S
authors.initials: JM
authors.lastname: Lamvohee
authors.forename: R
authors.initials: R
authors.lastname: Mootanah
authors.forename: P
authors.initials: P
authors.lastname: Ingle
authors.forename: K
authors.initials: K
authors.lastname: Cheah
authors.forename: J K
authors.initials: JK
authors.lastname: Dowell
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D015992:Body Mass Index; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D006801:Humans; D011336:Probability; D011474:Prosthesis Design; D013718:Tensile Strength; D014057:Tomography, X-Ray Computed