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Paul E. Di Cesare - One of the best experts on this subject based on the ideXlab platform.

  • Catastrophic Failure of a cemented collarless polished tapered cobalt chromium femoral stem used with impaction bone grafting a report of two cases
    Journal of Bone and Joint Surgery American Volume, 1999
    Co-Authors: Laith M Jazrawi, Craig J Della Valle, Frederick J Kummer, Edward M Adler, Paul E. Di Cesare
    Abstract:

    Revision total hip arthroplasty performed with use of impaction bone-grafting and insertion of a tapered femoral component with cement in patients who have severe bone loss in the proximal part of the femur has yielded encouraging short-term results4,9,10,13,16,17,20. The collarless, polished, tapered (CPT) femoral stem (Zimmer, Warsaw, Indiana), which was designed for this purpose, is manufactured from a high-strength material (forged cobalt-chromium) in order to avoid the substantial rate of stem fracture that has been observed in association with a component of similar geometry, the original Exeter femoral prosthesis (Howmedica, Rutherford, New Jersey)14. Femoral stems made of forged cobalt-chromium-molybdenum alloy rarely fracture; the only such Failures of which we are aware were attributed to defects that had been introduced during the manufacturing process18,22. In the original series of 433 polished, stainless-steel Exeter stems, which were implanted between 1970 and 1975, the rate of fracture was 3 percent (thirteen stems) and the fractures were attributed to the use of inferior materials and the thin distal aspect of the stem14. We are not aware of any reported fractures of the CPT femoral stem, despite its original highly tapered design. The purpose of this report is to describe the Catastrophic Failure of two cemented CPT femoral stems that had been used in conjunction with the impaction bone-grafting technique. Both Failures apparently were related to implant design and operative technique rather than to defects introduced during the manufacturing process. The results presented here are important because more orthopaedic surgeons are utilizing this technique to address deficiency in the proximal part of the femur in patients managed with revision total hip arthroplasty. CASE 1. A fifty-nine-year-old woman who had a history of degenerative …

  • Catastrophic Failure of the acetabular component in a ceramic- polyethylene bearing total hip arthroplasty
    Journal of Arthroplasty, 1998
    Co-Authors: Jordan A Simon, Enrique Ergas, Alan J. Dayan, Steven A. Stuchin, Paul E. Di Cesare
    Abstract:

    Recent research in total hip arthroplasty has focused on attempts to decrease wear at the femoral head-acetabulum articulation, to limit the production of debris that is believed to lead to osteolysis and prosthetic loosening. The use of ceramic-on-polyethylene bearing surfaces has been reported to produce lower wear rates and therefore may increase the life expectancy of the joint arthroplasty. Problems with this bearing have been reported to be due to ceramic femoral head fracture. Reported here are 2 cases of Catastrophic Failure of total hip arthroplasties, involving a ceramic femoral head, caused by Failure of the polyethylene acetabular liner, with subsequent penetration of the femoral head through the acetabular shell.

Toshiro Hayakawa - One of the best experts on this subject based on the ideXlab platform.

  • Reliable operation of strain‐compensated 1.06 μm InGaAs/InGaAsP/GaAs single quantum well lasers
    Applied Physics Letters, 1996
    Co-Authors: Toshiaki Fukunaga, Mitsugu Wada, Toshiro Hayakawa
    Abstract:

    We report the reliable operation of strain‐compensated InGaAs/InGaAsP/GaAs 1.06 μm separate confinement heterostructure single‐quantum‐well laser diodes with tensile‐strained InGaAsP barriers grown on GaAs substrate. High band‐gap strain‐compensation barriers are used to suppress the carrier leakage from a quantum well. This device has a high characteristic temperature of 268 K and low threshold current density of 200 A/cm2 with 0.75 mm cavity length. It was found that the characteristics of lasers without strain‐compensation are worse than those of strain‐compensated lasers at 1.06 μm wavelength. No Catastrophic Failure in strain‐compensated lasers is observed during 1000 h aging test at 25 °C under an automatic power control of 250 mW while all 1.06 μm lasers without strain‐compensation show Catastrophic Failure within 1000 h. It suggests that the crystal quality of laser with strain compensation is much better than that without strain compensation. The formation of defects caused by the presence of the...

  • reliable operation of strain compensated 1 06 μm ingaas ingaasp gaas single quantum well lasers
    Applied Physics Letters, 1996
    Co-Authors: Toshiaki Fukunaga, Mitsugu Wada, Toshiro Hayakawa
    Abstract:

    We report the reliable operation of strain‐compensated InGaAs/InGaAsP/GaAs 1.06 μm separate confinement heterostructure single‐quantum‐well laser diodes with tensile‐strained InGaAsP barriers grown on GaAs substrate. High band‐gap strain‐compensation barriers are used to suppress the carrier leakage from a quantum well. This device has a high characteristic temperature of 268 K and low threshold current density of 200 A/cm2 with 0.75 mm cavity length. It was found that the characteristics of lasers without strain‐compensation are worse than those of strain‐compensated lasers at 1.06 μm wavelength. No Catastrophic Failure in strain‐compensated lasers is observed during 1000 h aging test at 25 °C under an automatic power control of 250 mW while all 1.06 μm lasers without strain‐compensation show Catastrophic Failure within 1000 h. It suggests that the crystal quality of laser with strain compensation is much better than that without strain compensation. The formation of defects caused by the presence of the...

Alan J. Dayan - One of the best experts on this subject based on the ideXlab platform.

  • Catastrophic Failure of a metal on metal total hip arthroplasty secondary to metal inlay dissociation
    Journal of Arthroplasty, 2011
    Co-Authors: Michael J Alaia, Alan J. Dayan
    Abstract:

    Metal-on-metal bearing surfaces in total hip arthroplasty have been recently shown to have acceptable survivorship properties (J Bone Joint Surg Am. 2006;88:1183; J Bone Joint Surg Am. 2006;88:1173), and they have certain advantages and disadvantages when compared to conventional metal-on-polyethylene bearing surfaces. Like traditional metal-on-polyethylene bearings, these metal-on-metal implants may also suffer from Catastrophic Failure. This case report represents an unusual situation in a 57-year-old man in which dissociation of a metal inlay in a metal-on-metal total hip arthroplasty resulted in articulation of the inferior aspect of the inlay with the femoral neck, leading to femoral neck notching, extensive periprosthetic soft tissue metallosis, osteolysis, and subsequent prosthetic Catastrophic Failure.

  • Catastrophic Failure of the acetabular component in a ceramic- polyethylene bearing total hip arthroplasty
    Journal of Arthroplasty, 1998
    Co-Authors: Jordan A Simon, Enrique Ergas, Alan J. Dayan, Steven A. Stuchin, Paul E. Di Cesare
    Abstract:

    Recent research in total hip arthroplasty has focused on attempts to decrease wear at the femoral head-acetabulum articulation, to limit the production of debris that is believed to lead to osteolysis and prosthetic loosening. The use of ceramic-on-polyethylene bearing surfaces has been reported to produce lower wear rates and therefore may increase the life expectancy of the joint arthroplasty. Problems with this bearing have been reported to be due to ceramic femoral head fracture. Reported here are 2 cases of Catastrophic Failure of total hip arthroplasties, involving a ceramic femoral head, caused by Failure of the polyethylene acetabular liner, with subsequent penetration of the femoral head through the acetabular shell.

Toshiaki Fukunaga - One of the best experts on this subject based on the ideXlab platform.

  • Reliable operation of strain‐compensated 1.06 μm InGaAs/InGaAsP/GaAs single quantum well lasers
    Applied Physics Letters, 1996
    Co-Authors: Toshiaki Fukunaga, Mitsugu Wada, Toshiro Hayakawa
    Abstract:

    We report the reliable operation of strain‐compensated InGaAs/InGaAsP/GaAs 1.06 μm separate confinement heterostructure single‐quantum‐well laser diodes with tensile‐strained InGaAsP barriers grown on GaAs substrate. High band‐gap strain‐compensation barriers are used to suppress the carrier leakage from a quantum well. This device has a high characteristic temperature of 268 K and low threshold current density of 200 A/cm2 with 0.75 mm cavity length. It was found that the characteristics of lasers without strain‐compensation are worse than those of strain‐compensated lasers at 1.06 μm wavelength. No Catastrophic Failure in strain‐compensated lasers is observed during 1000 h aging test at 25 °C under an automatic power control of 250 mW while all 1.06 μm lasers without strain‐compensation show Catastrophic Failure within 1000 h. It suggests that the crystal quality of laser with strain compensation is much better than that without strain compensation. The formation of defects caused by the presence of the...

  • reliable operation of strain compensated 1 06 μm ingaas ingaasp gaas single quantum well lasers
    Applied Physics Letters, 1996
    Co-Authors: Toshiaki Fukunaga, Mitsugu Wada, Toshiro Hayakawa
    Abstract:

    We report the reliable operation of strain‐compensated InGaAs/InGaAsP/GaAs 1.06 μm separate confinement heterostructure single‐quantum‐well laser diodes with tensile‐strained InGaAsP barriers grown on GaAs substrate. High band‐gap strain‐compensation barriers are used to suppress the carrier leakage from a quantum well. This device has a high characteristic temperature of 268 K and low threshold current density of 200 A/cm2 with 0.75 mm cavity length. It was found that the characteristics of lasers without strain‐compensation are worse than those of strain‐compensated lasers at 1.06 μm wavelength. No Catastrophic Failure in strain‐compensated lasers is observed during 1000 h aging test at 25 °C under an automatic power control of 250 mW while all 1.06 μm lasers without strain‐compensation show Catastrophic Failure within 1000 h. It suggests that the crystal quality of laser with strain compensation is much better than that without strain compensation. The formation of defects caused by the presence of the...

Salah Atrah - One of the best experts on this subject based on the ideXlab platform.

  • delayed Catastrophic Failure of a ceramic head in hybrid total hip arthroplasty
    Journal of Arthroplasty, 2009
    Co-Authors: Imran Anwar, Gauraang Bhatnagar, Salah Atrah
    Abstract:

    Catastrophic Failure of ceramic implants is a rare but known complication of total hip arthroplasty where such implants have been used. We report an unusual case of a 67-year-old woman who underwent bilateral hybrid total hip arthroplasty using ceramic-on-polyethylene bearings. Seven years later, she presented with left-sided hip pain in the absence of any trauma. She was found to have a completely shattered ceramic head, with subsequent erosion of the metal taper of the femoral stem through the polyethylene insert, its metal shell, and into the pelvis. This complicated subsequent revision surgery, as removal of the acetabular component resulted in a large pelvic defect that required an acetabular reinforcement ring and bone grafting. She recovered well after the revision procedure.