In Vitro Pressurization of the Acetabular Cement Mantle

Total Hip Replacement: Tensile Stress in Bone Cement is influenced by Cement Mantle Thickness, Acetabular Size, Bone Quality, and Body Mass Index

“…Our findings agree with the works of Lankester et al [28], Herberts and Malchau, and Carter et al [3,19]. Lankester et al [28] investigated the optimum thickness for the acetabular cement mantle, using a biomechanical analysis.…”

“…However, our study showed that, for acetabular diameters of 50 mm or less, a cement mantle thickness of at least 4 mm is required for long-term stable fixation of the acetabular component. This is not in line with the study of Lankester et al [28] who recommended the use of a 2 mmthick cement mantle for acetabular cup sizes ranging from 44 mm to 52 mm. Our findings differ from theirs, possibly because they used mahogany blocks to simulate the acetabulum, whereas we modelled the whole reconstructed hemi pelvis in a more physiological manner to investigate the stress behaviour during the transfer process from the cement mantle to the pelvic bone.…”

“…Lankester et al [28] investigated the optimum thickness for the acetabular cement mantle, using a biomechanical analysis. Their study suggests that surgeons should aim to achieve a mantle at least 2 mm thick, which agrees with our findings for acetabular diameter larger than 52 mm.…”

“…The acetabulum was virtually reamed into a hemispherical bed, which is reported to result in a uniform cement mantle, smooth stress distribution and, consequently, a stable reconstruction [27,28]. Three 8-mm deep and 8-mm diameter anchorage holes were then modelled perpendicular to the bed of the acetabulum, one in each of the iliac, pubic and ischial regions, to simulate a good cemented surgical fixation [15].…”

Stresses in cement mantles of hip replacements: effect of femoral implant sizes, body mass index and bone quality

“…A hemispherical cut with dimensions corresponding to the size of the acetabulum being investigated was used to remove excess bone in the acetabular region to simulate the reaming process during surgery. A hemispherical acetabular bed helps achieve an even cement mantle and a smooth stress distribution in the cement mantle and, hence, a more stable reconstruction (Oh et al 1985;Haskess 1998;Lamvohee et al 2003;Lankester et al 2004). Three anchorage holes 8mm deep and 8mm in diameter were modelled perpendicular to the surface of the acetabulum and were located one in each in the three bones of the acetabulum, the pubis, the ishium and the iliac bone, following on results from our previous study (Mootanah et al 2002).…”