The authors analysed the bone implant interface in a hydroxyapatite (HA) coated titanium alloy stem in a femoral fracture occurring 2 years after operation following a trauma, in the absence of any clinical symptoms of failure. A comparison between the coated and the uncoated part was made. In the coated region of the stem, connective tissue with collagen fibres perpendicularly orientated to the implant was observed, increasing stability of the system. On the contrary, in the uncoated part, fibres were orientated in parallel with less stability.
De SantisE., GaspariniG., PaoliA., CudoniS.. Bone-prosthesis implant relation in total cementless hip arthroprosthesis. Hip International1992; 2: 27.
2.
TakeshitaF., AyukawaY., IyamaS., MuraiK., SuetsuguT.. Long-term evaluation of bone-titanium interface in rat tibiae using light microscopy, transmission electron microscopy and image processing. J Biomed Mater Res1997; 37: 235.
3.
FurlongR.J., OsborneJ.F.. Fixation of hip prosthesis by hydroxyapatite ceramic coatings. J Bone Joint Surg1991; 73-B: 741.
4.
HardyD.C., FrayssinetP., BoneG., AuthomT., Le NaelouS.A., DelinceP.E.. Two-year outcome of hydroxyapatite-coated prosthesis. Two femoral prosthesis retrieved at autopsy. Acta Orthop Scand1994; 65: 253.
5.
MaloneyW.J., SmithR.L., SchmalzriedT.P., ChibaJ., HueneD., RubashH.. Isolation and characterization of wear particles generated in patients who have had failure of a hip arthroplasty without cement. J Bone Joint Surg1995; 77A: 1301.
6.
LesterD.K.. Microscopic studies of human press-fit titanium hip prosthesis. Clin Orthop1997; 341: 143.
7.
EnghC.A., MassinP., SuthersK.E.A.. Roentgenographic assessment of the biological fixation of porous-surfaced femoral components. Clin Orthop1990; 257: 107.
8.
EnghC.A., Zettl-SchafferK.F., KukitaY., SweetD., JastyM., BragdonC.. Histological and radiographic assessment of well functioning porous-coated acetabular components. A human postmortem retrieval study. J Bone Joint Surg1993; 75-A: 814.
9.
PiconiC., MaccauroG.. Zirconia as ceramic biomaterial. Biomaterials1998; 20: 1.
