Two cases of unusual valgus and lateral stem displacement in cementless total hip replacement are reported. A certain number of mechanical conditions must have been present to cause this unusual prosthesis displacement. The Authors suggest that the stem's design was one of these factors.
GoldringS.R., SchillerA.L., RoelkeM., RourkeC.M., O'NeillD.A., HarrisW.H.The synovial-like membrane at the bone-cement interface in loose total hip replacements and its proposed role in bone lysis. J Bone Joint Surg Am1983; 65: 575–84.
2.
GruenT.A., McNeiceG.M., AmstutzH.C.Modes of failure of cemented stem-type femoral components: a radiographic analysis of loosening. Clin Orthop1979; 141: 17–27.
3.
PazzagliaV.E.Pathology of the bone-cement interface in loosening of total hip replacement. Arch Orthop Trauma Surg1990; 109: 83–8.
