Impacted bone stiffness measured during construction of morsellised bone samples.

Impacted morsellised bone is widely used for filling bone deficiencies during revision of total hip arthroplasties. However, the physical properties and mechanical behaviour of this bone material are still not well understood. In this study we recorded the increase of stiffness in pellets of morsellised bone during their construction. The construction of bone pellets was measured stroke-by-stroke to ascertain optimal stiffness. We have derived an impact-constrained module of elasticity, which represents the dynamic resistance in the granulated bone mass to impaction. Drop level of the impaction slap hammer increases constrained bone stiffness during impaction and load. However, increasing the number of impaction strokes at the highest drop level does not improve stiffness properties; no significant increase in stiffness was achieved after five strokes on each layer of morsellised bone.

[1]  E. Smith,et al.  Massive early subsidence following femoral impaction grafting. , 1997, The Journal of arthroplasty.

[2]  B. W. Schreurs,et al.  Favorable results of acetabular reconstruction with impacted morsellized bone grafts in patients younger than 50 years: A 10- to 18-year follow-up study of 34 cemented total hip arthroplasties , 2001, Acta orthopaedica Scandinavica.

[3]  Njj Nico Verdonschot,et al.  Biomechanics of artificial joints : the hip , 1997 .

[4]  F. Massey,et al.  Introduction to Statistical Analysis , 1970 .

[5]  I. Atroshi,et al.  Results of Hip Revision Using the Exeter Stem, Impacted Allograft Bone, and Cement , 2001, Clinical orthopaedics and related research.

[6]  R. Plackett,et al.  Introduction to Statistical Analysis. , 1952 .

[7]  B. W. Schreurs,et al.  Time-dependent mechanical properties of HA/TCP particles in relation to morsellized bone grafts for use in impaction grafting. , 2001, Journal of biomedical materials research.

[8]  C. Howie,et al.  Mechanical considerations in impaction bone grafting , 1999 .

[9]  A. Alho,et al.  Impaction bone grafting in revision hip surgery , 2000 .

[10]  I. Atroshi,et al.  Early Complications After One Hundred and Forty-four Consecutive Hip Revisions with Impacted Morselized Allograft Bone and Cement , 2002, The Journal of bone and joint surgery. American volume.

[11]  A. Alho,et al.  Impaction bone grafting in revision hip surgery. A high incidence of complications. , 2000, The Journal of bone and joint surgery. British volume.

[12]  X. Banse,et al.  Stiffness and compactness of morselized grafts during impaction: An in vitro study with human femoral heads , 2001, Acta orthopaedica Scandinavica.

[13]  A. Timperley,et al.  Impacted cancellous allografts and cement for revision total hip arthroplasty. , 1993, The Journal of bone and joint surgery. British volume.

[14]  Shu Chien,et al.  Handbook of Bioengineering , 1986 .

[15]  O. Nilsson,et al.  Impacted corticocancellous allografts: recoil and strength. , 1999, The Journal of arthroplasty.

[16]  J. Boldt,et al.  Revision total hip arthroplasty using impaction bone grafting with cemented nonpolished stems and charnley cups. , 2001, The Journal of arthroplasty.

[17]  N. Janbu.  Soil Compressibility as Determined by Oedometer and Triaxial Tests , 1963 .

[18]  K. Drabu,et al.  Impaction bone grafting using freeze-dried allograft in revision hip arthroplasty. , 2001, The Journal of arthroplasty.

[19]  S. Toksvig-Larsen,et al.  Early migration of femoral components revised with impacted cancellous allografts and cement. A preliminary report of five patients. , 1995, The Journal of bone and joint surgery. British volume.

[20]  C. R. Ullrich,et al.  Mechanical properties of compacted morselized cancellous bone graft using one-dimensional consolidation testing. , 2000, Journal of biomechanics.

[21]  E. Orwoll,et al.  Longitudinal precision of dual‐energy X‐ray absorptiometry in a multicenter study , 1991, Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research.

[22]  E. Nicolau,et al.  Growth models , 1987 .