Metas' turnaround case: a study about the turnaround strategies and the related decision streams shaping them

Ankara : The Department of Business Administration of Bilkent Univ., 1995.Thesis (Master's) -- Bilkent University, 1995.Includes bibliographical references.Meta§ which is the first private steel factory with arc furnace technology, begins to implement the “turnaround” strategy during the 90’s. This case aims to determine the reasons that cause the turnaround strategy and the strategic decision streams through the turnaround. Meta$ could not succeed financially in the extensive competition of the 80’s eventhough having better production techniques compared to it’s competitors, having a company image accompanied by the “quality” concept, and sufficient social right given to its workers. After the production was stopped it began to exercise turnaround strategy by the help of the funds that were injected by the government. Production started again and necessary structural changes were done. As during the privatization period the government gave way to survival by nationalization, this regeneration period has a special feature. Also it’s importance comes from the fact that this case is a successful example of a turnaround that was done by a big scaled firm in Turkey. In this case, the Meta§’ turnaround is examined. Starting from the reasons creating crises together with the environmental conditions the case is set on the general turnaround explanations. In the research part, the chronological determination of strategic areas results in generic strategies. So by this method, the strategic ways reaching to turnaround strategies and the effects of turnaround strategy on Meta§’ organizational life is examined.Tüzüner, TolgaM.S

Mosaicplasty technique in the treatment of osteochondral lesions of the knee

kocaoglu, baris/0000-0002-2537-0660WOS: 000262566100008PubMed: 19158455Amaç: Tam kat kıkırdak lezyonu nedeniyle mozaikplasti uygulanan hastaların erken dönem sonuçları değerlendirildi. Çalışma planı: Çalışmaya, lateral (n=6) ve medial (n=18) femur kondillerinin yük taşıyan bölgelerinde bulunan tam kat kıkırdak lezyonu nedeniyle mozaikplasti uygulanan 24 hasta (8 kadın, 16 erkek; ort. yaş 39; dağılım 17-52) alındı. Cerrahi yaklaşım olarak açık teknik tercih edildi. Hastaların aynı taraf femur kondili sulkus terminalis seviyesinden alınan otogreftler mozaikplasti tekniği ile defektli bölgelere implante edildi. Ortalama defekt çapı 13.5 mm (dağılım 8-27 mm), hasta başına uygulanan greft sayısı 1.5 (dağılım 1-4) idi. Hastalar son takiplerinde klinik olarak Lysholm ve ICRS (International Cartilage Repair Society) skorlama sistemleri ile değerlendirildi. Radyolojik değerlendirmede Kellgren-Lawrence ölçütleri kullanıldı. Verici saha değerlendirmesi Bandi skorlama sistemi ile yapıldı. Ortalama takip süresi 30.5 ay (dağılım 13-47 ay) idi. Sonuçlar: Ameliyat öncesi ortalaması 46 (dağılım 28-64) olan Lysholm skoru, ameliyat sonrasında 86’ya (dağılım 76-100) yükseldi. ICRS skorlama sistemine göre, 16 hasta (%66.7) derece I, altı hasta (%25) derece II, iki hasta (%8.3) derece III bulundu. Beş hastada (%20.8) gözlenen verici saha ile ilgili şikayetler altı ay içinde günlük aktiviteleri kısıtlamayacak düzeye geriledi. Tüm hastaların normal aktivite düzeylerine döndüğü görüldü. Ameliyat sonrası manyetik rezonans değerlendirmesinde greftlerde gevşeme ya da çökme bulgusuna rastlanmadı. KellgrenLawrence ölçütlerine göre 20 hastada (%83.3) osteoartrit bulgusuna rastlanmadı. Dört hastada (%16.7) osteoartrit başlangıç bulguları görüldü. Çıkarımlar: Mozaikplasti, minimal invaziv teknikle uygulanabilmesi, tek seanslı oluşu, düşük komplikasyon oranı ve düşük maliyeti nedeniyle, tam kat kıkırdak lezyonlarında güvenilir bir tedavi yöntemidir_We evaluated early results of patients undergoing mosaicplasty for full-thickness cartilage lesions of the knee. Methods_ The study included 24 patients (8 females, 16 male

The surgical overcorrection of lenke type 1 deformities with selective fusion segments: What happens to the coronal balance?

Purpose: The aim of our study is to determine the alterations on coronal balance after overcorrection of Lenke type 1 curve, retrospectively. Methods: Datas of 34 patients (29 female, 5 male patients; mean age, 16.3±3.3 years; range, 13-24 years) surgically treated for scoliosis between 2004 and 2010 were reviewed, retrospectively. The adolescent idiopathic scoliosis patients with Lenke type 1 curve treated with only posterior pedicle screw and postoperative thoracic curves less than 10° by Cobb method on frontal plane were enrolled in this study. Mean follow-up period was 52.5±29.7 months. Results: The mean amount of the preoperative thoracic curves was measured as 41.2°±6.1° (range, 30°-56°). The mean amount of the early postoperative thoracic curves was measured as 6.5°±1.8° (range, 3°-9°). The mean amount of the thoracic curves was measured as 8.5°±4.6° (range, 3°-22°) during the last follow-up (p=0.01). The mean preoperative coronal balance was measured as 8.5 mm (range, 1-30 mm). The mean early postoperative coronal balance was measured as 3.5 mm (range, 0-36 mm). The mean coronal balance was measured as 5.5 mm (range, 0-38 mm) during the last follow-up (p>0.05). Conclusion: We suggest that Lenke type 1B and 1C should be carefully evaluated and the fusion levels should be accurately selected in order to maintain the correction of coronal balance. We suggest that selective fusion with overcorrection in Lenke type 1A are applied to curves that can be corrected lumbar curve at the preoperative bending radiograph and curves that not have coronal decompensation and >10° distal junctional kyphosis, preoperatively

Subungual osteochondroma - A diagnostic dilemma

kavak, ayse/0000-0002-4679-1181WOS: 000236603300011PubMed: 16546954Osteochondroma is the most common skeletal neoplasm of all benign bone tumors. However, it rarely occurs subungually. In this location, the lesion may penetrate the skin, causing nail deformity, and can easily be misdiagnosed. We report two cases of subungual osteochondroma of the distal phalanges of the first toes with cutaneous penetration and discuss the clinical, histologic, and radiographic features and the treatment options

The effect of overlapping on the primary stability of osteochondral grafts in mosaicplasty

kocaoglu, baris/0000-0002-2537-0660WOS: 000257227800005PubMed: 18365176Our goal was to determine the primary stability of overlapping osteochondral grafts used in mosaicplasty by studying the effect of overlapping in an ex vivo model. Osteochondral grafts, 10 mm in diameter, were transplanted from the trochlea of cow femurs to the weight-bearing area of the lateral femoral condyle with 0, 15, or 30% overlap. The grafts were pushed in with a probe at a rate of 2 mm/min, and load (N)-displacement (mm) curves were recorded. In Group I (control, 0% overlap), insertion 1 and 2 mm below the cartilage level could be reached at 572.3 +/- 273.6 and 999.3 +/- 427.6 N, respectively. In Group II (15% overlap), insertion 1 and 2 mm below the cartilage level could be reached at 263.6 +/- 91.7 and 746.6 +/- 88.0 N, respectively. In Group III (30% overlap), insertion 1 and 2 mm below the cartilage level could be reached at 179.4 +/- 31.2 and 657.0 +/- 106.5 N, respectively. The loads that were necessary to produce a 1-mm dent in the grafts were significantly different between Groups I and II and Groups I and III (p < 0.05). These results suggest that stability may be reduced by graft overlapping in mosaicplasty surgery. The results of this ex vivo animal study contribute to a more complete understanding of the primary stability of osteochondral grafts in an overlapping position as well as postoperative protocols

Arthroscopic repair of radial lateral menicus tear by double horizontal sutures with inside-outside technique

kocaoglu, baris/0000-0002-2537-0660;WOS: 000259839400003PubMed: 18684627The purpose of this prospective Study is to report the outcome of arthroscopic repair of radial lateral menicus tears at the junction of the anterior horn and body. Five patients with an average age of 27 years were treated. The repair was performed with double horizontal Sutures by inside-out technique, using zone-specific, curved cannulae with no enhancement technique. A mean of 2.4 Superior and 2.8 inferior stitches were performed. Reduction was obtained in all cases. Patients were evaluated using Lysholm functional knee scores. All patients were clinically and radiologically examined using MRI to assess meniscus integrity at the repair site, over an average follow-up period of 3 1 months. All patients were able to return to their former level of activity. In all cases, MRI showed a fully healed meniscus at the repair sites, with no further disruption of the debrided area. The mean Lysholm scores improved from 62 preoperatively to 94 postoperatively. The difference between preoperative and postoperative values was found to be statistically significant (p=0.029). No cases of postoperative extra or intra-articular complications were encountered. We found that repairing rather than resecting radial lateral menicus tears I I I that extend into capsular zone, improves activity level. (C) 2008 Elsevier B.V All rights reserved

In vitro bacterial adherence to teicoplanin and calcium sulfate-soaked bone cement

Leblebicioglu, Hakan/0000-0002-6033-8543WOS: 000229303900007PubMed: 15920902The aim of this study was to assess in vitro the improvement in release kinetics for teicoplanin and the inhibition of bacterial adhesion on calcium sulfate-soaked PMMA discs. Calcium sulfate has been used in vivo and shown to be biocompatible, and prevention of bacterial adhesion may be expected with calcium sulfate-soaked polymethylmethacrylate (PMMA). Discs were made by adding teicoplanin and calcium sulfate in powder form to PMMA powder. The antibiotic concentration eluted from PMMA discs was assayed by agar diffusion assay. Nonadherent bacteria were removed by washing and adherent bacteria were detached by sonication. The suspension including nonadherent bacteria was seeded on sheep blood agar plate and incubated for 24 h at 37 degrees C for the growth of microorganisms. The teicoplanin released from discs containing calcium sulfate was higher than that released from discs which had not been soaked with calcium sulfate. The count of bacteria adhering to the calcium sulfate-soaked discs was lower than that from the discs without calcium sulfate. In conclusion, the addition of calcium sulfate to teicoplanin-loaded PMMA bone cement may provide local antibiotic concentrations higher than MIC values due to increased antibiotic release. Furthermore, calcium sulfate was found to be effective in reducing bacterial adherence to treated discs

In vivo evaluation of teicoplanin- and calcium sulfate-loaded PMMA bone cement in preventing implant-related osteomyelitis in rats

alper, murat/0000-0001-7069-0623WOS: 000243185500008PubMed: 17267341The objective of this study was to evaluate the efficacy of teicoplanin- and calcium sulphate-loaded polymethylmethacrylate (PMMA) bone cements in preventing experimental implant-related osteomyelitis in rats. Four groups of antibiotic-loaded rods were prepared and were implanted into the lateral condylus of the rat femur after inoculation of Staphylococcus aureus. The effectiveness of these were assessed microbiologically, radiographically, and histopathologically. Radiographic evaluation revealed a significant reduction of periostal reaction and osteolysis in rats that received calcium sulphate- and teicoplanin-loaded rods. Histopathological evaluation confirmed these results. Acute infection and bone necrosis were found to be significantly lower in rats that had received calcium sulphate- and teicoplanin-loaded rods. The addition of calcium sulfate to teicoplanin-loaded PMMA bone cement appeared satisfactory as an antibiotic-carrying system for prophylaxis of experimental implant-related osteomyelitis, but further investigations are needed to reach definitive statements for clinical applications