Araştırma Çıktıları

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Subject: search.filters.subject.Knee joint

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    Mid-term implant survival, functional and radiological results and mechanical complications of mega-prosthetic reconstruction around the knee with the PENTA (R) system
    (SPRINGER, 2022-01-01) Ozger, Harzem; Alpan, Bugra; Salduz, Ahmet; Gurkan, Volkan; Sungur, Mustafa; Valiyev, Natig; Eralp, Levent
    Aim Mega-prosthetic reconstruction is the most common treatment method for massive osteoarticular defects caused by tumor resection around the knee. The new implant is a highly modular rotational-hinged megaprosthesis system with a distinct pentagonal stem geometry and variable implantation options. The aim of this study is to present the mid-term implant survival characteristics, functional and radiological results and mechanical complication profile of the new megaprosthesis. Methods One hundred and one mega-prosthetic knee reconstruction procedures in 90 patients (M/F: 51/39) utilizing the new implant system were retrospectively analyzed. In 68 patients, the megaprosthesis was used for primary reconstruction following tumor resection while it was used for revision of other implants in 22. The mean age was 28.5 (7-66) years and the mean follow-up was 59.2 (24-124) months. The most common primary pathology was osteosarcoma with 63-70\% patients, the most common anatomical site of involvement was the distal femur with 56-62\% patients. Results Henderson Type 2 failure (aseptic loosening) was seen in only 2-2.2\% patients while Type 3 (structural failure) was seen in 29-32.2\% Although the 5-year anchorage survival rate was 94.3\%, overall mechanical implant survival was 76.1\% at 5 years due to a relatively high failure rate in the first-generation hinge mechanism of the implant. The 5-year hinge survival rate demonstrated a significant improvement rate from 61.7\% to 87.2\% between the first and second generations of the implant (p = 0.027). The mean MSTS score was 24 out of 30 (14-29). The mean cumulative ISOLS radiographic score for index megaprosthesis operations was 19.7 (12-24), which corresponded to excellent outcome. Conclusion The new megaprosthesis system is a reliable choice for the reconstruction of tumor-related massive osteoarticular defects around the knee. Although long-term follow-up is necessary for a definitive evaluation of the implant's survival characteristics, midterm follow-up yields exceptional anchorage properties related to pentagonal stem geometry with very good functional outcomes.
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    Morphologic Characteristics of Meniscofemoral Ligaments
    (ORTADOGU AD PRES \& PUBL CO, 2011-01-01) Sozmen, Aycan Guclu; Yalin, Aymelek; Uzun, Ibrahim; Sehirli, Umit Suleyman
    Objective: The aim of this study was to describe the presence, lengths, widths, attachment sites, course of the fibers, histological properties and the sizes of the attachment sites of the meniscofemoral ligaments to the lateral meniscus. Material and Methods: Forty fresh frozen knees obtained from 22 human cadavers were examined. The knee was dissected by posterior approach and the anterior and posterior meniscofemoral and posterior cruciate ligaments were measured after exposing them. The sections of ligaments were stained with the Mason trichrome stain and under light microscope. Results: At least one of the meniscofemoral ligaments was present in 37 (92.5\%) cases. Twenty (50\%) were anterior meniscofemoral ligaments and 24(60\%) were posterior. In seven cases (17.5\%) both anterior and posterior meniscofemoral ligaments were present. The oblique fibers of the posterior cruciate ligament were observed in 11 (27.5\%) cases. A separating membrane between the meniscofemoral ligaments and the posterior cruciate ligament was observed. The mean lengths of the posterior and anterior meniscofemoral ligaments were 23.82 +/- 1.51 mm and 21.55 +/- 0.97 mm, respectively. The mean widths of the anterior and posterior meniscofemoral ligaments were 3.43 +/- 0.57 mm and 4.09 +/- 0.77 mm, respectively. The mean lengths of the attachment sites of posterior and anterior meniscofemoral ligaments to lateral meniscus were 11.30 +/- 1.85 mm and 6.19 +/- 1.23 mm respectively and the mean widths were 3.39 +/- 0.92 mm and 4.88 +/- 0.96 mm, respectively. Conclusion: Details concerning the dimensions and histological properties of the meniscofemoral ligaments, their relation to the posterior cruciate ligament and lateral meniscus will contribute to a clear understanding of the biomechanics of the knee as well as the radiologic diagnosis and the treatment of knee problems.