3925 Sheridan Dr
Amherst NY 14226
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Changing surgeons improves outcome of subsequent primary total joint arthroplasty in previously dissatisfied patients. - The Journal of arthroplasty
We assessed whether patients who were dissatisfied with their previous primary hip (THA) or knee (TKA) arthroplasty, done by another surgeon, would have continued dissatisfaction or would have significant improvements in outcome scores following their subsequent primary THA or TKA. The majority of reasons provided for switching surgeons and/or institutions related to dissatisfaction with some aspect of their surgical experience specifically involving the surgeon-patient interaction itself. All 12 THA and TKA patients noted that their subsequent arthroplasty had decreased their pain, improved their function and that they were satisfied with their result. All patients had a statistically significant improvement in their Harris Hip Score or Knee Society Score, WOMAC and SF-36 questionnaires. This study demonstrates that previous dissatisfaction with a THA or THA does not predispose to a suboptimal outcome following subsequent primary hip or knee arthroplasty.Copyright Â© 2013 Elsevier Inc. All rights reserved.
Severe metal-induced osteolysis many years after unipolar hip endoprosthesis. - Clinical orthopaedics and related research
Modularity of the femoral head-neck junction provides increased intraoperative flexibility to the surgeon. Complications of this modularity include damage to the trunnion, with subsequent bone and/or soft tissue loss from adverse reactions to metal debris.We describe two cases of severe metal-induced osteolysis and soft tissue damage requiring revision 10 and 13 years following implantation of a unipolar endoprosthesis. Damage to the trunnion resulted in severe acetabular and trochanteric osteolysis and soft tissue loss requiring complex revision surgery.Several reports have shown the trunnion, the head-neck interface, and the neck-stem couple as the causes of this early failure secondary to metal ion release from mechanical fretting corrosion or from crevice corrosion at these modular interfaces. These reports have been in association with a total hip prosthesis rather than a unipolar endoprosthesis. Revision of a unipolar endoprosthesis is most commonly attributable to stem loosening or acetabular erosion from the large femoral head articulating on the host acetabular cartilage and not owing to failure of the trunnion.Trunnion damage resulting in a severe reaction to metal debris with acetabular osteolysis, erosion of the greater trochanter, and loss of the abductor mechanism can occur years after implantation of a cementless unipolar endoprosthesis. This raises questions regarding long-term safety of the modular interface of a contemporary cementless stem and a large-diameter unipolar head. We recommend long-term followup of patients with a unipolar endoprosthesis as early recognition and treatment are required to avoid a potentially complex revision.
A new procedure for tibial spine avulsion fracture fixation. - Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA
Several techniques have been described to repair tibial spine avulsion fractures. Most of these methods use either internal fixation with a screw or suture fixation over a tibial tunnel bone bridge. This article presents a new technique for the surgical management of tibial spine avulsion fractures. The technique involves the creation of a suture mattress to compress and reduce the tibial spine into its fracture bed. The advantages of this technique are that it creates four points of fixation, aids with reduction, and allows for compression of the tibial spine fragment anatomically in its fracture bed. Level of evidence V.
Hydrothermal descriptive chemistry and single crystal structure determination of cesium and rubidium thorium fluorides. - Inorganic chemistry
Two new cesium thorium fluorides and three new rubidium thorium fluorides have been synthesized hydrothermally and structurally characterized. The structures of two polymorphs of CsTh(3)F(13) are described in space group P6/mmm with a = 8.2608(14) and c = 8.6519(17) and space group Pmc2(1) with a = 8.1830(16), b = 7.5780(15), and c = 8.6244(17). The analogous orthorhombic compound RbTh(3)F(13), with a = 8.1805(16), b = 7.4378(15), and c = 8.6594(17) in space group Pmc2(1), is also reported. Two other rubidium thorium fluorides are also described: RbTh(2)F(9) crystallizes in the space group Pnma where a = 8.9101(18), b = 11.829(2), and c = 7.4048(15), and Rb(7)Th(6)F(31) crystallizes in the space group R3 where a = 15.609(2) and c = 10.823(2). Comparison of these materials was made on the basis of their structures and synthesis conditions. The formation of these species in hydrothermal fluids appears to be dependent upon the concentration of the alkali fluoride mineralizer solution and, thus, the ratio of alkali ions to thorium in the system.
Hydro-thermally synthesized Î±-Ba(2)P(2)O(7). - Acta crystallographica. Section E, Structure reports online
Single crystals of Î±-Ba(2)P(2)O(7), dibarium diphosphate, were obtained under hydro-thermal conditions. The structure belongs to the diphosphate A(2)P(2)O(7) series with A being an alkaline earth cation. Î±-Ba(2)P(2)O(7) crystallizes isotypically with Î±-Sr(2)P(2)O(7). All atomic sites have site symmetry m with the exception of two O atoms which reside on general positions. Both Ba(2+) cations are coordinated by nine terminal O atoms from eclipsed diphosphate P(2)O(7) anions to form a three-dimensional network throughout the structure.
K(3)(Sc(0.875)Nb(0.125))Nb(2)O(9)H(1.75): a new scandium niobate with a unique cage structure. - Acta crystallographica. Section C, Crystal structure communications
Potassium scandium niobate hydroxide, K(3)(Sc(0.875)Nb(0.125))Nb(2)O(9)H(1.75), is a new scandium niobate with a unique cage structure. The structure contains two non-equivalent K(+) sites (3m and 6m2 site symmetry), one disordered Sc(3+)/Nb(5+) site (3m site symmetry), one Nb(5+) site (3m site symmetry), two O(2-) sites (m and mm2 site symmetry) and one H(+) site (m site symmetry). Both scandium and niobium have octahedral environments, which combine to form cages around potassium. One K atom lies in a cube-like cage built of seven octahedra, while the other K atom is encapsulated by an eight-membered trigonal face-bicapped prism. The cages form sheets that extend along the ab plane.
Ba(2)Ti(2)Si(2)O(9)F(2), a new titanium silicate. - Acta crystallographica. Section C, Crystal structure communications
Dibarium dititanium difluoride dioxide heptaoxidodisilicate, Ba(2)Ti(2)Si(2)O(9)F(2), is a new edge-sharing titanate with a unique titanium silicate framework. All atoms in the structure are in general positions. Titanium oxyfluoride octahedra combine with silicon tetrahedra to form a double stacked chain, which is the base unit of the layered framework. The Ba atoms lie in channels that extend along the a axis.
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3925 Sheridan Dr Amherst, NY 14226
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