Interfacial Fracture Toughness of Synthetic Bone-Cement Interface

Abstract

Conventionally, the bonding strength of bone-cement interface is obtained by mechanical strength testing which tends to produce large variability between specimens and test methods. In this work, interfacial fracture toughness of synthetic bone-cement interface has been determined using sandwiched Brazilian disk specimens. Experiments were carried out under selected loading angles from 0 to 25 degrees to achieve full loading conditions from mode I to mode II. Solutions for complex stress intensity factors as well as strain energy release rates were obtained for a sandwich disk with a finite interlayer using the finite element method. Phase angles were obtained at a fixed distance to the crack tip. The fracture loads were obtained from the load displacement curves and the values of interfacial fracture toughness were calculated from the fracture loads and the finite element J-integral solutions. The implication of this information on the assessment of fixation in acetabular replacements was discussed in the light of in-vitro fatigue testing of implanted acetabula.

Effects of interfacial crack and implant material on mixed‐mode stress intensity factor and prediction of interface failure of cemented acetabular cup

“…Earlier study indicated that the value of K C at the bone–cement interface under Mode‐I loading was within the range of 0.5–0.8 MPa.m 1/2 (Chiang & Hung, ). Similarly, for mixed‐mode loading conditions, the value of K C was within the range of 0.1–1.6 MPa.m 1/2 , as stated in the earlier studies (Tong, ; Wang & Agrawal, ).…”

“…In this present study, the maximum and positive values of stress and corresponding SIF were considered (Figures ), since both the interfaces are more compliant in tension than compression (Janssen, Mann, & Verdonschot, ). The values of mixed‐mode SIF ( K I and K II ) at the bone–cement interface were obtained, and these values were within the limit of interfacial fracture toughness (K C ) as mentioned in the earlier studies (Chiang & Hung, ;Tong, ; Wang & Agrawal, ). Earlier study indicated that the value of K C at the bone–cement interface under Mode‐I loading was within the range of 0.5–0.8 MPa.m 1/2 (Chiang & Hung, ).…”

“…Some of the researchers studied the fatigue failure analysis and crack growth analysis in the cement mantle of acetabular replacements and stated that the crack propagates linearly in the radial direction until the bonecement interface (Benbarek, Bachir Bouiadjra, El Mokhtar, Achour, & Serier, 2013;Zant, Wong, & Tong, 2007). Earlier published studies investigated the interfacial behavior and fracture toughness of the bone-cement interface under mixed-mode loading conditions using both experimental and numerical approaches, and they provide some fundamental understanding of the cement fixation technique for joint replacements (Tong, 2006;Wang et al, 2010). However, they did not consider the influence of the implant material and the presence of interfacial cracks on interface failure of the cemented acetabular cup.…”

Interfacial strength of novel PMMA/HA/nanoclay bone cement

“…Sandwich Brazilian disk specimens were chosen for the present study to represent the nature of loading at the bone-cement interface within the acetabular prosthetic system, which is a mixture of compression and shear [15]. Brazilian disk specimen [16] is a convenient arrangement that allows measurement of fracture toughness as a function of loading angle θ to achieve loading conditions from tensile to shear.…”