Browsing by Author "Anastasiadis, Zoy"
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Item Midterm Results After Tantalum Cones in 1-Stage Knee Exchange for Periprosthetic Joint Infection: A Single-Center Study(2020) Abdelaziz, Hussein; Biewald, Philipp; Anastasiadis, Zoy; Haasper, Carl; Gehrke, Thorsten; Hawi, Nael; Citak, MustafaBackground: The use of tantalum cones to reconstruct extensive bone defects in revision total knee arthroplasty has been established. We aimed to evaluate the midterm results after 1-stage knee exchange for periprosthetic joint infection using tantalum cones. Methods: Seventy-two patients (mean age, 70 ± 8.2 years) treated with a 1-stage exchange for infected total knee arthroplasty using porous tantalum cones, between 2011 and 2016, were retrospectively included. Either rotating or pure hinge system in combination with femoral and/or tibial cones was used. Survivorship analysis (septic and aseptic) was performed. Prospectively, functional outcome was assessed at a mean follow-up of 49.9 ± 18.8 months (range, 24-88). Results: A total of 15 patients (21%) were rerevised, 8 (11.1%) for infection and 7 (10%) for aseptic loosening, requiring cone exchange in 12 patients (17%). Cone-related survival free from any revision was 83% ± 3.8 standard deviation (95% confidence interval, 74-90), and infection-free survival was 89% ± 4.2 standard deviation (95% confidence interval, 76-93). No significant correlation was reported between the types of prosthesis used (P = .8) or implanted cones and failure (P = .6). History of a previous septic revision increased the risk of cone revision after the index surgery (P < .001). Preoperative Hospital for Special Surgery knee score improved from 47 ± 16 (range, 14-87) to 60 ± 17 (range, 24-84) points at the latest follow-up. Conclusion: First study reports on outcomes of the 1-stage exchange using tantalum cones for knee periprosthetic joint infection with additional severe bone loss. Midterm cone-related and infection-free survival offered good results and provided reasonable functional outcomes.Item Septic arthritis in ACL reconstruction surgery with hamstring autografts. Eleven years of experience(Elsevier, 2014) Calvo, Rafael; Figueroa, David; Anastasiadis, Zoy; Vaisman, Alex; Olid, Arturo; Gili, Federico; Valderrama, Juan José; De La Fuente, PaulinaBACKGROUND: Knee joint infection after ACL reconstruction is a rare complication with a low reported incidence, but the consequences can be devastating. The purpose of the study was to determine the incidence of septic arthritis after primary ACL reconstruction with hamstring auto-graft and the risk factors that may be associated. METHOD: A retrospective study of all primary ACL reconstruction from January 2000 to May 2011. Electronic medical records were reviewed to determine the number of infections, operating time, associated procedure, time of presentation after surgery, infection treatment, microbiological cultures and graft retention. At the end of the follow-up (18-108months) a functional assessment of all the infected patients was performed using the Lysholm score with the Lysholm score. RESULTS: We analyzed 1564 cases of primary ACL reconstruction with hamstring autograft, of which seven cases were diagnosed with postoperative joint infection (incidence rate of 0.45%). The infectious agent most frequently isolated was a coagulase-negative Staphylococcus. Neither intraoperative factors nor age correlated with the development of the infection. The average Lysholm score was 95 points (range 89-100 points). All but two patients retained their reconstructed ACL. The results of the five patients in which the graft was preserved were significantly better than the two patients that had their grafts removed (p=0.03). CONCLUSION: We conclude that septic arthritis post ACL reconstruction has a low incidence rate, which if handled at an early stage allows the patients a satisfactory return to their previous activities. Graft retention is important to obtain better functional results. LEVEL OF EVIDENCE: IV.