Rates of Revision Surgery Using Chevron-Austin Osteotomy, Lapidus Arthrodesis, and Closing Base Wedge Osteotomy for Correction of Hallux Valgus Deformity
ABSTRACT To identify complications that necessitated revision surgery after the primary operation, a multicenter retrospective chart review was conducted for 646 patients who received either a modified chevron-Austin osteotomy (270 patients), modified Lapidus arthrodesis (342 patients), or closing base wedge osteotomy (34 patients) to correct hallux valgus deformity. Revision surgery for complications was calculated and compared. All surgery was performed by 1 of 5 staff foot and ankle surgeons at Kaiser Permanente medical centers. Complications included recurrent hallux valgus, iatrogenic hallux varus, painful retained hardware, nonunion, postoperative infection, and capital fragment dislocation. The rates of revision surgery after Lapidus arthrodesis, closing base wedge osteotomy and chevron-Austin osteotomy were similar with no statistical difference between them. The total rate for re-operation was 5.56% among patients who received chevron-Austin osteotomy, 8.82% among those who had a closing base wedge osteotomy, and 8.19% for patients who received modified Lapidus arthrodesis. Among patients who had the chevron-Austin osteotomy procedure, rates of re-operation were 1.85% for recurrent hallux valgus and 1.48% for hallux varus. Among patients who had the modified Lapidus arthrodesis, rates of re-operation were 2.92% for recurrent hallux valgus and 0.29% for hallux varus. Among patients who had the closing base wedge osteotomy, rates of reoperation were 2.94% for recurrent hallux valgus and 2.94% for hallux varus. The collected comparative complication rates should serve to provide adjunctive information for foot and ankle surgeons and patients regarding hallux valgus surgery.
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ABSTRACT: This paper studies the near field distribution of a hand-held transceiver, Kenwood model TR2500. Its near field distribution on the horizontal plane is studied in three cases. One case is where the antenna is normal to the ground without the human model. The other two cases are where the angle included between the antenna and the normal line of ground is 45 degrees with the human model and without it respectively. The paper gives the near field contour plots of the transceiver by numerical calculation and experiments. It shows that the fields in most regions decrease when the transceiver is placed close to the human modelElectromagnetic Compatibility Proceedings, 1997 International Symposium on; 06/1997
Conference Paper: Performance analysis of nonlinear adaptive filter based on LMS algorithm[Show abstract] [Hide abstract]
ABSTRACT: This paper presents a performance analysis of the adaptive Volterra nonlinear filter which employs a previously developed algorithm based on the least mean square method. In the linear case, the eigenvalue spread of the autocorrelation matrix controls the speed of convergence. The larger the eigenvalue spread, the slower the convergence speed. In the nonlinear case, the eigenvalue spreads are in general large. Therefore the performance is poor. However, based on Therrien et al. (1997), with proper manipulation, the autocorrelation matrix can be diagonalized giving less eigenvalue spread much like the linear filter. Through this analysis, the step size bounds, autocorrelation matrix misadjustment and time constant are all examined. The results of our analysis are verified by computer simulation.Signals, Systems & Computers, 1997. Conference Record of the Thirty-First Asilomar Conference on; 12/1997
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ABSTRACT: Selecting the appropriate surgical procedure for the treatment of hallux valgus not always is clear. Every procedure has its merits depending on the individual and circumstances. Correcting pain and deformity, avoiding recurrence, and preserving or re-establishing normal foot function should be the goals of bunion surgery. Although radiographic measurements can be helpful, their weight is not as important as understanding the function of the first ray in each patient. This article attempts to guide procedure selection based on re-establishing normal foot function as much as possible while meeting patients' goals and expectations.Clinics in Podiatric Medicine and Surgery 08/2009; 26(3):395-407, Table of Contents. DOI:10.1016/j.cpm.2009.03.005 · 0.51 Impact Factor