The first hip stem designed to accommodate the anterior approach to the hip, the AMIStem Hip System, has recently achieved its 50,000th implantation since its launch in 2009.
When launched, the AMIStem System represented the first family of femoral components specifically designed to facilitate the anterior approach. Based on the proven clinical performance and design characteristics of the Quadra Hip System1,2, the AMIStem featured a reduced lateral shoulder and modified length.
This design evolution provided key advantages: an easier stem introduction due to the reduced lateral shoulder and the potential for reduced bone removal due to the overall reduced length of the stem. Like the Quadra stem, the AMIStem has proven very stable in both cementless and cemented versions3,4.
At 1 year, bone mineral density is equivalent for the two femoral stems5. In addition, AMIStem has proven to be a reliable solution for hip replacement6.
[1] Thomsen M, Lee C, Jakubowitz E. Lab-Report Quadra-S, Medacta International SA: Measurement of the initial stability, Ortopädische Universitätsklinik Heidelberg, May 25 2006.
[2] Moreau P. Cementless HA Coated Quadra stem: 7 years clinical outcomes. M.O.R.E. Journal, 2 3-6, January 2012
[3] Bernardoni M, Siccardi F, Quagliana I, Grimoldi G. Mechanical stability of the AMIStem a standardized in-vitro analysis. M.O.R.E. Journal, 2011, May; Vol.1: 8-11.
[4] Bernardoni M, Siccardi F, Quagliana I, Camesasca S. Experimental assessment of the cemented AMIStem-C implant stability. M.O.R.E. Journal, 2012, January; Vol.2: 11-16.
[5] Petridis G, Scherer M, Gradinger R, Beck J, Nolde M. Periprosthetic bone mineral density after total hip arthroplasty with an AMIStem or Quadra femoral component performed by a minimally invasive anterior approach (AMIS): a prospective randomised clinical dual-energy x-ray absorptiometry study. Hip Int 2012; 22 (04): 477.
[6] Kalberer F. Stem design: the logical evolution. Podium presentation at the 6th M.O.R.E. International Symposium, Stresa, Italy, May 13-14, 2011.
