Mehmet Demirel

Dr. Mehmet Demirel


Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 March 2017 in Journal of Orthopaedic Surgery and Research
Verified
Journal Article
Open access
PDF file
GPGökhan Polat
Gökhan Polat
HBHalil İbrahim Balcı
Halil İbrahim Balcı
MÇMehmet Fevzi Çakmak
Mehmet Fevzi Çakmak
MDMehmet Demirel
Mehmet Demirel
CŞCengiz Şen
Cengiz Şen
MAMehmet Aşık
Mehmet Aşık
The purpose of this study is to report and analyze the long-term outcomes of the patients who underwent high tibial osteotomy (HTO) with three different techniques for the treatment of medial compartment arthrosis. A total of 187 patients (195 knees) who underwent HTO between 1990 and 2010 were retrospectively evaluated. Eighty-eight knees, opening-wedge osteotomy with Puddu plate (group A); 51 knees, transverse osteotomy below the tubercle with external fixator (group B); and 29 knees, closing-wedge osteotomy with staple fixation (group C) were included in the study. The patients (mean age 44.9 ± 10.6 years, mean follow-up of 12.4 ± 3.2 years) were called for final controls and survival rates of the knees, and functional evaluations of the patients were performed using Knee Society Score (KSS) and Hospital for Special Surgery (HSS) knee score assessments. In the comparison of the three groups, there were no differences regarding the mean age, preoperative arthrosis levels, or preoperative deformity analyses (n.s.). The main finding of these comparisons showed that the closing-wedge osteotomy has the greatest lateralization effect on mechanical axis deviation (MAD) (p = 0.024), the greatest valgization effect on medial proximal tibial angles (MPTA) (p = 0.026), and the lowest posterior tibial slope (PTS) angles (p = 0.032) in comparison to the other groups. There were no functional differences between the three groups in the long-term assessment of patients with KSS and HSS knee scores. According to the Kaplan–Meier survival analysis, the probability of the survival of the native knee joint after HTO was 93.4% in 5 years and 71.2% in 10 years in our study group. During the follow-up of the 168 knees, revision surgery with total knee replacement was needed in 27 knees (16%). The mean time from HTO to total knee replacement was 8.9 years in these patients. HTO has acceptable long-term clinical and functional results that should not be underestimated by orthopedic surgeons under pressure to perform arthroplasty operations.

1 December 2015 in International Journal of Surgery
Verified
Journal Article
Closed access
GKGökhan Karademir
Gökhan Karademir
YBYücel Bilgin
Yücel Bilgin
AEAli Erşen
Ali Erşen
GPGökhan Polat
Gökhan Polat
MBMehmet I. Buget
Mehmet I. Buget
HBHalil Ibrahim Balcı
Halil Ibrahim Balcı
Proximal femoral fractures are often seen in older patients and are associated with high mortality. Introduction to old age population is latening due to advancements in medical sciences and increasing life expectancy. The aim of the study was to evaluate factors affecting mortality in patients above 75 years of age who had been operated because of proximal femur fractures. Patients with age 75 and over who suffers from post-fall proximal femoral fracture who underwent surgery with one of following three methods (hemiarthroplasty, proximal femoral nail or total hip arthroplasty) were evaluated retrospectively. Effects on mortality were examined for factors such as type of surgery, type of anesthesia, preoperative ASA score (American Society of Anesthesiologists Score), need for intensive care, need for blood transfusion, operation waiting time and hospitalization duration. 115 patients who met inclusion criterion were included in the study out of 224 overall. 75 patients were women and 40 were males. Mortality rate after first year was found to be 40%. Patients over 85 years old had higher rates of mortality (p = 0,0003) than respectively younger patients (75-85). Sex was found to have no impact on mortality (p = 0.5039). There was no statistically significant difference in terms ASA score (p = 0.1518). Order of applied surgical methods with mortality risk rates was found to be total hip arthroplasty > hemiarthroplasty > proximal femoral nail (p = 0.0003). Type of anesthesia, the use of cement during arthroplasty, operation waiting time and hospitalization duration was not directly related with mortality rate (type of anesthesia p = 0.63, the use of cement during arthroplasty p = 0.223, operation waiting time p = 0.5 and hospitalization duration p = 0.19). Age is the primary risk factor on first year mortality in patients older than 75 years old with hip fractures. Addition to older age, more need to blood transfusions, and arthroplasty are other risk factors for first year mortality. It should be kept in mind that after 75 years old first year mortality may be higher if the patient is treated with arthroplasty.

6 January 2020 in Acta Orthopaedica et Traumatologica Turcica
Verified
Journal Article
Open access
MEMehmet Ersin
Mehmet Ersin
MDMehmet Demirel
Mehmet Demirel
MBMehmet İlKe Büget
Mehmet İlKe Büget
IEIpek Saadet Edipoglu
Ipek Saadet Edipoglu
AAAta Can Atalar
Ata Can Atalar
AEAli Erşen
Ali Erşen
Objective: The aim of this study was to determine the effect of intravenous (IV) tranexamic acid (TRX) use on visual clarity during arthroscopic rotator cuff repair. Methods: This prospective, randomized, double-blinded, placebo-controlled study was conducted in patients scheduled for an arthroscopic rotator cuff repair. In total, 60 patients were randomly distributed into two groups: control (28 patients: 11 male, 17 female; mean age=53 years, age range=19-65) and TRX (32 patients: 15 male, 17 female; mean age=50, age range=18-69). In the TRX group, the arthroscopy was performed through the bolus IV administration of 10 mg/kg TRX in 100 ml isotonic saline solution. In the control group, the arthroscopy was performed through the bolus IV administration of 100 ml isotonic saline solution. In both the groups, the IV administration was carried out after the induction of anesthesia. At the end of each procedure, the surgeon rated the visual clarity on a scale from 1 to 10. In addition, operation time (minutes), irrigation amount used in operation (lt), and the need of pressure increase because of bleeding were recorded. Results: No adverse effects were seen during the study period. Visual clarity in TRX group was significantly better than the control group (the mean visual clarity scores=8.1/10 (range=7-10) vs 7/10 (range=5-9); p=0.018). The amount of solution was significantly less in the TRX group (10.2 lt (range=3.5-21)) than in the control group (15.8 lt (range=5.8-27); p=0.007, post-hoc power=95.7%), although the operation time was slightly longer in the TRX group (106 minutes (range=50-210)) than in the control group (99 minutes (range=45-165); p=0.24). Moreover, the need for the increase in pressure owing to bleeding was found significantly less in the TRX group (5.8 times (range=(0-9)) than in the control group (9.6 times (range=0-13); p=0.04, post-hoc power=94.5%). Conclusion: Preoperative IV TRX administration seems to be effective in improving visual clarity and reducing the need for high pressure and the amount of irrigation fluid during the arthroscopic rotator cuff repair. Level of Evidence: Level II, Therapeutic study Cite this article as: Ersin M, Demirel M, Büget Mİ, Edipoğlu İS, Atalar AC, Erşen A. The effect of intravenous tranexamic acid on visual clarity during arthroscopic rotator cuff repair: A randomized, double-blinded, placebo-controlled pilot study. Acta Orthop Traumatol Turc 2020; 54(6): 572-6.

1 November 2019 in Injury
Verified
Journal Article
Closed access
CSCengiz Sen
Cengiz Sen
MDMehmet Demirel
Mehmet Demirel
YSYavuz Sağlam
Yavuz Sağlam
HBHalil I. Balcı
Halil I. Balcı
LELevent Eralp
Levent Eralp
MKMehmet Kocaoğlu
Mehmet Kocaoğlu

19 February 2020 in The Journal of Knee Surgery
Verified
Journal Article
Closed access
PDF file
OAOmer Ayik
Omer Ayik
MDMehmet Demirel
Mehmet Demirel
FBFevzi Birisik
Fevzi Birisik
AEAli Ersen
Ali Ersen
HBHalil I. Balci
Halil I. Balci
IOIrfan Ozturk
Irfan Ozturk
The present randomized controlled study aims to evaluate whether tourniquet application during total knee arthroplasty (TKA) has an effect on (1) thigh muscle strength (quadriceps and hamstring muscle strength) and (2) clinical outcomes (postoperative knee range of motion [ROM], postoperative pain level, and Knee Society Score [KSS]). The effects of tourniquet application during TKA were investigated in 65 patients randomly allocated to one of two groups: TKA with a tourniquet and TKA without a tourniquet. Patients in both groups were comparable in terms of the demographic and clinical data (p > 0.05 for age, number of patients, sex, radiographic gonarthrosis grade, American Society of Anesthesiologists [ASA] classification, and body mass index [BMI]). All patients in both groups were operated by the same surgeon using one type of prosthesis. Isokinetic muscle strength (peak torque and total work) of knee extensors (quadriceps) and flexors (hamstrings) was measured in Newton meters (Nm) using a CYBEX 350 isokinetic dynamometer (HUMAC/CYBEX 2009, Stoughton, MA). The combined KSS (knee score + function score), visual analog scale (VAS), and knee ROM were measured preoperatively and at 1 and 3 months postoperatively to evaluate clinical outcomes. There were no significant differences between the two groups in preoperative and postoperative values of isokinetic muscle strength (peak torque and total work) and aforementioned clinical outcomes (p < 0.05). The present study has shown that quadriceps strength and clinical outcomes were not improved in the early postoperative period (3 months) when a tourniquet was not used during TKA.

5 January 2017 in Acta Orthopaedica et Traumatologica Turcica
Verified
Journal Article
Open access
MDMehmet Demirel
Mehmet Demirel
AEAli Erşen
Ali Erşen
GKGökhan Karademir
Gökhan Karademir
AAAta Can Atalar
Ata Can Atalar
MDMehmet Demirhan
Mehmet Demirhan
This study aimed to present middle-term functional and radiological outcomes of the transfer of the lesser tuberosity in the management of reverse Hill-Sachs lesions following posterior dislocations of the shoulder. With a diagnosis of neglected posterior shoulder dislocation (8 locked, 5 recurrent), 13 male patients (age range: 28–72; mean age: 39.3 years) who underwent the transfer of the lesser tuberosity due to reverse Hill-Sachs lesions, were retrospectively reviewed based on functional and radiological data. The etiologies were: epilepsy in 9 patients, a traffic accident in 2 patients, and fall in 2 patients. To assess the patients' functional level, American Shoulder and Elbow Surgeons (ASES) and Constant Scores were used, and the patients' range of motion at the last follow-up was measured. To evaluate the development of arthrosis, the final follow-up control plain radiographs were examined. The average size of the defects calculated from the axial computed tomography sets was 27% (range: 20%–40%). The average length of follow-up was 30 months (range: 12–67 months). At the last follow-up visit, the main ASES and Constant Scores were 78 and 85, respectively, and the average degrees of flexion, abduction, and external rotation were 163°, 151°, and 70° respectively. The concentric reduction was observed postoperatively. McLaughlin procedure appears to be a safe and effective method in the treatment of neglected posterior shoulder dislocations with reverse Hill-Sachs lesion. Level IV, Therapeutic study.