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YENİGÜL, ALİ ERKAN

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YENİGÜL

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ALİ ERKAN

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    Publication
    Effect of bone morphogenic protein-2 and desferoxamine on distraction osteogenesis
    (Elsevier Sci Ltd, 2022-05-25) Kalay, Emre; ERMUTLU, CENK; YENİGÜL, ALİ ERKAN; Yenigül, Ali Erkan; Yalçınkaya, Ulviye; YALÇINKAYA, ÜLVİYE; Sarısözen, Bartu; SARISÖZEN, MEHMET BARTU; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Ortopedi ve Travmatoloji Anabilim Dalı.; 0000-0003-4071-8052; ACP-2755-2022; AFH-1678-2022; ABI-7283-2020; AEQ-5464-2022
    Background: Angiogenesis is crucial for formation of a stable regenerate during distraction osteogenesis (DO). This experimental study evaluates if bone morphogenic protein-2 (BMP-2) and desferrioxamine (DFO), two agents which are known to induce neoangiogenesis in vivo , would increase angiogenesis and osteogenesis, and improve mechanical properties of bone regenerate in DO model. Methods: Twenty-four tibias of 24 New Zealand rabbits were osteotomized and fixed with semi-circular fixators. Three groups of 8 animals were formed. BMP-2 soaked scaffolds were used in the first group, whereas daily local DFO injections were made in the second group. Subjects in the control group did not receive any agents during the surgery or in the distraction period. The rabbits in all three groups underwent distraction at a rate of 0.6 mm/day for 15 days following the 7-day latent period. Animals were sacrificed on day 38, and the tibia were harvested for histological and mechanical examination of the regenerate. Results: All 24 rabbits survived the surgical procedure, and there were no side effects against the BMP-2 and local DFO. Three-point bending tests revealed a higher force (361 +/- 267 N.) required for fracture in Group 1 ( p : 0.018). Similarly, the bending moment in Group 1 (5.4 +/- 4.0 Nmm) was significantly higher than the other groups ( p : 0.021). There was no significant difference between the groups in terms of deflection and stiffness ( p > 0.05). Histologically, there was no statistical difference between the groups in terms of endochondral, periosteal, and intramembranous ossification and VEGF activity ( p > 0.05). Conclusion: BMP-2 and DFO stimulate angiogenesis by increasing VEGF activity. Angiogenesis is one of the most important mechanisms for the initiation and maintenance of new bone formation. Stimulation of angiogenesis in unfavorable biomechanical conditions may not be sufficient for ideal bone formation.
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    Publication
    Treatment of locally aggressive benign bone tumors by means of extended intralesional curettage without chemical adjuvants
    (Sage Publications Inc, 2022-04-22) Yenigül, Ali Erkan; Sofulu, Ömer; Erol, Bülent; YENİGÜL, ALİ ERKAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Ortopedi ve Travmatoloji Anabilim Dalı.; ACP-2755-2022
    Objectives: The aim of this study is to present the clinical, oncological, and functional results of locally aggressive benign bone tumors treated with extended intralesional curettage without the use of adjuvant in a tertiary orthopedic oncology center.Method: A total of 172 patients treated with surgical curettage and high-speed burrs for the diagnosis of aneurysmal bone cyst, giant cell tumor, osteoblastoma, chondroblastoma, and chondromyxoid fibroma were included in the study. Demographic, radiological, and clinical data of the patients were analyzed.Results: One-hundred seventy two patients (101 (59%) female and 71 (41 %) male) with a mean age of 23 years (6-84). The mean follow-up period was 48 months (18-108). In the study, a total of 8 (4.6%) patients had postoperative complications, 17 (9.9%) patients had recurrence in the postoperative period. Diameter greater than 5cm was found to be a risk factor for recurrence (p < 0.004). The probability of developing complications was found to be significantly higher in patients with recurrence (p < 0.001). There was no significant relationship between recurrence and age, tumor type, and tumor stage.Conclusion: Successful treatment results can be obtained with extended surgical curettage, high-speed burr, and cauterization without the use of chemical adjuvants in locally aggressive bone tumors.