title: The effect of bone porosity on the shear strength of the bone-cement interface.
abstract: This study investigated the relationship of bone porosity and bone-cement interface shear strength. One hundred forty-six samples were taken from the distal metaphysis of 20 bovine femora. After cementation, the shear strength of the bone-cement interface was tested. According to the porosity, the samples were divided into four groups. Group I (porosity <80%) had a median interface shear strength of 4.03 MPa, group II (80% <or=porosity <85%) 7.06 MPa, group III (85% <or=porosity <90%) 9.44 MPa, and group IV (porosity >or=90%) 14.85 MPa. The differences between the four groups were statistically significant. Greater porosity yielded a stronger bone-cement interface shear strength under the identical cementation technique. The optimum porosity of cancellous bone is more than 90% which can be found by reaming or drilling to deeper bone in cemented acetabular fixation.
authors.affiliation: Avon Orthopaedic Centre, Southmead Hospital, Bristol, UK. ramirfeyz@yahoo.com
authors.forename: Rouin
authors.initials: R
authors.lastname: Amirfeyz
authors.forename: Gordon
authors.initials: G
authors.lastname: Bannister
mesh_terms: D000818:Animals; D001843:Bone Cements; D002417:Cattle; D002484:Cementation / Q000379:methods*; D005269:Femur / Q000601:surgery; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing / Q000379:methods*; D016062:Porosity; D011475:Prosthesis Failure; D033081:Shear Strength; D013314:Stress, Mechanical
chemical_list: D001843:Bone Cements