Emre Karadeniz - Academia.edu (original) (raw)

Papers by Emre Karadeniz

European Journal of Trauma and Emergency Surgery

Introduction We prospectively examined the effect of pedicle screw placement at a young age ( Met... more Introduction We prospectively examined the effect of pedicle screw placement at a young age ( Methods Patients with early-onset deformity who received pedicle screw placement before the age of 5 years and had preoperative and final follow-up axial imaging were included. To increase sample size, patients who had the same criteria but with no preoperative axial images were also included. Anteroposterior and transverse diameters of the canal and pedicle length were measured on axial images cutting through the middle of the pedicle (figures 1 and 2). Results 13 patients (five male, eight female) met inclusion criteria. Average age at surgery was 46·6 months (29–60), and average follow-up 49·8 months (24–82). 77 instrumented and 32 non-instrumented levels were studied. The table summarises measurements. In the nine patients without preoperative axial imaging, pedicle lengths and canal diameters seemed to accord with previously published normative morphological data for this age group. Co...

The Journal of trauma

The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion wo... more The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion would change the strength of the fixation to bending forces and whether any relationship existed between deformity and increased strength of fixation. Rear leg tibias from 2-year to 3-year-old sheep were affixed with the help of a custom-made guide to a six-hole dynamic compression plate and divided into three groups. In group 1, fixation was performed using screws perpendicular to the plate axis in two planes. In group 2, screws were placed at a 20-degree angle to the axis of the shaft and perpendicular to the transverse plane. In group 3, the screws were placed at a 20-degree angle to the shaft axis and 7 degrees on the transverse plane. Gap-close bending and side-bending tests were performed in a three-point bending fashion. The maximum moment of force and deformation at the time of the failure was analyzed. In gap-close bending tests, mean maximum moment of forces for groups 1, 2, and ...

Eklem hastaliklari ve cerrahisi = Joint diseases & related surgery, 2017

This study aims to retrospectively evaluate and compare the mid-term clinical follow-up results o... more This study aims to retrospectively evaluate and compare the mid-term clinical follow-up results of patients who were treated with open or closed reduction due to carpometacarpal (CMC) fracture dislocation. Medical charts of 15 patients (1 male, 14 females; mean age 32.5±10.5 years; range 18 to 55 years) who were operated for fourth and fifth finger CMC fracture dislocations were examined. Patients were divided into two groups according to applied treatment as closed reduction and percutaneous pinning (CRPP, n=6) and open reduction and percutaneous pinning (ORPP, n=9). Patients were assessed by a hand therapist blinded to the treatment groups. Patients were compared in respect of visual analog scale (VAS), Quick Disabilities of the Arm, Shoulder and Hand (Q-DASH) scores, and grip strength. Complications were recorded. Mean VAS values of ORPP group and CRPP group were 2.33±0.50 and 1.67±0.52, respectively. Mean Q-DASH values of ORPP group and CRPP group were 13.63±3.21 and 9.05±2.36, ...

Journal of Orthopaedic Surgery and Research

Background: EFECE systems are newly defined internal fixation systems, which are suitable for pat... more Background: EFECE systems are newly defined internal fixation systems, which are suitable for patella fracture fixation. The aim of this study was to compare the fixation strength of EFECE Systems with tension band wiring for transverse patellar fracture simulation on fresh frozen cadaver models. Methods: Quadriceps tendon-patella-patellar tendon (QT-P-PT) complex was prepared from human cadavers. After simulation of a transverse patella fracture, in group 1, 5 patella were fixed with a pair of 1.2 mm EFECE wires and 4 EFECE devices. In group 2, 5 patella were fixed with a pair of 1.2 mm Kirschner wires (K-wire) and a cerclage wire according to the tension band technique. Using a testing device with custom-made jaws, increasing distraction force was applied to these QT-P-PT complexes. Extension of these complexes with the distraction forces was observed. The maximum distraction force and the elongation during maximum force were evaluated. Results: After 5 experiments with the EFECE systems, there was no EFECE wire breakage or EFECE wire-EFECE device catching failure. The median maximum force was 740 N (720-810 N). During maximum distraction force the median extension was 2.5 mm (1.6-2.5 mm). After 5 experiments with the tension band technique, there was no Kwire breakage. The median maximum force was 330 N (240-510 N). During this maximum distraction force the median extension was 3.4 mm (2.2-3.8 mm). Conclusions: Based on the biomechanical advantages, patella fracture treatment with EFECE systems may constitute a reasonable alternative in the treatment of patella fractures.

Background EFECE Systems are newly-defined internal fixation systems, which are suitable for pate... more Background EFECE Systems are newly-defined internal fixation systems, which are suitable for patella fracture fixation. The aim of this study was to compare the fixation strength of EFECE Systems with tension band wiring for transverse patellar fracture simulation on fresh frozen cadaver models.Methods Quadriceps tendon-patella-patellar tendon (QT-P-PT) complex was prepared from human cadavers. After simulation of a transverse patella fracture, in Group 1, 5 patella were fixed with a pair of 1.2 mm EFECE wires and 4 EFECE devices. In Group 2, 5 patella were fixed with a pair of 1.2 mm Kirschner wires (K-wire) and a cerclage wire according to the tension band technique. Using a testing device with custom-made jaws, increasing distraction force was applied to these QT-P-PT complexes. Extension of these complexes with the distraction forces was observed. The maximum distraction force and the elongation during maximum force were evaluated.Results After 5 experiments with the EFECE Syste...

The Journal of Trauma: Injury, Infection, and Critical Care, 2011

The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion wo... more The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion would change the strength of the fixation to bending forces and whether any relationship existed between deformity and increased strength of fixation. Rear leg tibias from 2-year to 3-year-old sheep were affixed with the help of a custom-made guide to a six-hole dynamic compression plate and divided into three groups. In group 1, fixation was performed using screws perpendicular to the plate axis in two planes. In group 2, screws were placed at a 20-degree angle to the axis of the shaft and perpendicular to the transverse plane. In group 3, the screws were placed at a 20-degree angle to the shaft axis and 7 degrees on the transverse plane. Gap-close bending and side-bending tests were performed in a three-point bending fashion. The maximum moment of force and deformation at the time of the failure was analyzed. In gap-close bending tests, mean maximum moment of forces for groups 1, 2, and 3 was 51.90 Nm, 67.47 Nm, 82.05 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; p=0.053 for group 2 vs. group 3). In side-bending tests, the mean maximum moment of force was 34.63 Nm, 49.91 Nm, and 49.29 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; no significant difference was observed between groups 2 and 3). When the two bending tests were evaluated together, only the mean moment of forces of groups 1 and 3 were statistically different (p=0.006). There was no difference between any groups in terms of the deformity at the time of the maximum moment of force. Oblique screw placement in two planes increases the strength of the plate-screw fixation under bending forces; however, there is no relationship between deformity and increased strength of fixation.

Turkiye Klinikleri Journal of Neurosurgery Special Topics, 2011

Journal of Spinal Disorders and Techniques, 2015

Retrospective cohort. The purpose of this study is to compare the anterior-posterior surgery to p... more Retrospective cohort. The purpose of this study is to compare the anterior-posterior surgery to posterior-only vertebra resection for congenital kyphoscoliosis in pediatric patients. Vertebral column resection is a very powerful correction technique mainly used in the treatment of severe and rigid spinal deformities. The technique can be applied with combined anterior and posterior vertebral column resection (APVCR) or posterior-only vertebral column resection (PVCR) approaches. PVCR has gained popularity recently due to several apparent advantages, but APVCR is still believed by some to be a viable alternative, despite the use of an anterior exposure. A retrospective chart and radiographic review was performed including the patients with congenital kyphoscoliosis up to 16 years of age who were operated on by a single senior surgeon in our department after 2005. The data included surgical time, estimated blood loss, duration of hospital and postoperative intensive care unit stay, intraoperative and postoperative complications. Preoperative, postoperative, and follow-up radiographs were evaluated for scoliosis, kyphosis, and spinal balance. Twenty-six patients (20 girls, 6 boys) met the inclusion criteria. APVCR was performed on 17 (median age, 13.2 y) and PVCR on 9 (median age, 10.7 y). Scoliosis correction at the time of last follow-up was 54.3% and 52.6% for APVCR and PVCR, respectively, whereas the average kyphosis correction was 25.4 degrees in APVCR and 30.1 degrees in PVCR group. Surgical time, hospital stay, and estimated blood loss were all significantly higher in the APVCR group, whereas the complication rates were similar. No neurological or vascular complications were encountered. This study showed that although the operative time and surgical blood loss were higher with APVCR, there were no major complications and the radiologic outcomes were similar between APVCR and PVCR. APVCR should be considered as an acceptable technique especially in deformities where PVCR would be technically difficult or at the beginning of the spine surgeon's learning curve. Level III.

Acta orthopaedica et traumatologica turcica, 2015

The aim of this study was to determine the effect of pentoxifylline (PTX) on angiogenesis and the... more The aim of this study was to determine the effect of pentoxifylline (PTX) on angiogenesis and the healing of a critical-sized segmental defect of the radius diaphysis in a rat model, using radiological and histological grading systems. The study included 24 female Sprague-Dawley rats (weight: 300±20 g) divided into 4 groups. A critical-sized segmental defect was created in the radius diaphysis in all rats. In Group 1, morcellized iliac crest autografts were used to fill the segmental bone defect. In Group 2, segmental bone defects were filled using morcellized iliac crest autografts, and 25 mg/kg/day PTX was applied intraperitoneally. In Group 3, the segmental bone defects were not filled, and in Group 4 the segmental bone defects were left unfilled, and an intraperitoneal (IP) dose of 25 mg/kg/day PTX was applied. Rats were sacrificed at postoperative Week 8, and defects were evaluated using radiographic, histological and immunohistochemical methods. There were significant differen...

Spine, 2012

A longitudinal case study. To determine whether pedicle screws placed in an immature spine exert ... more A longitudinal case study. To determine whether pedicle screws placed in an immature spine exert effect on the continued growth of the vertebral body. Pedicle screws have revolutionized surgical treatment of spinal deformities by allowing a mode of secure fixation that provides consistently better correction rates in adults and adolescents. In the young child, however, the trajectory of pedicle screws takes them through an open physis: the neurocentral cartilage. There exists little information regarding the possible effect of pedicle screws inserted at a young age on further development of the spine and the spinal canal. Patients undergoing pedicle screw instrumentation of at least 2 levels before the age of 5 years (60 mo) for the first time for any diagnosis and who had been followed for at least 24 months were included. Measurements were performed in instrumented and adjacent noninstrumented levels without visible deformity in pre- and postoperative cross-sectional images and compared using statistical methods. Ninety segments in 15 patients met the inclusion criteria (average age at instrumentation 46.3 mo [range, 29-60 mo]). Forty segments had no screws and 50 had at least 1 screw. Pedicle length and vertebral body diameter had significantly increased in both groups, whereas spinal canal parameters did not change significantly. No significant difference was observed between the growth rates in levels with or without screws in pedicle length, vertebral body diameter, or spinal canal parameters (anterior-posterior and interpedicular diameters, and area). Pedicle screw instrumentation performed before the age of 5 years does not cause a negative effect on the growth of pedicles, the transverse plane of the vertebral body, or the spinal canal. It can be safely performed in the treatment of deformity in this age group.

Journal of Craniofacial Surgery, 2006

The congenital upper lip sinuses are rare and they have previously been reported only in 40 cases... more The congenital upper lip sinuses are rare and they have previously been reported only in 40 cases. We have presented a case report of congenital midline upper lip sinus in an elderly age. Although the treatment modality is very easy and successful in any cases, the etiology of this rare congenital situation has been obscure and further studies should be done to find out.

Acta Orthopaedica et Traumatologica Turcica, 2013

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The Journal of Trauma: Injury, Infection, and Critical Care, 2011

The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion wo... more The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion would change the strength of the fixation to bending forces and whether any relationship existed between deformity and increased strength of fixation. Rear leg tibias from 2-year to 3-year-old sheep were affixed with the help of a custom-made guide to a six-hole dynamic compression plate and divided into three groups. In group 1, fixation was performed using screws perpendicular to the plate axis in two planes. In group 2, screws were placed at a 20-degree angle to the axis of the shaft and perpendicular to the transverse plane. In group 3, the screws were placed at a 20-degree angle to the shaft axis and 7 degrees on the transverse plane. Gap-close bending and side-bending tests were performed in a three-point bending fashion. The maximum moment of force and deformation at the time of the failure was analyzed. In gap-close bending tests, mean maximum moment of forces for groups 1, 2, and 3 was 51.90 Nm, 67.47 Nm, 82.05 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; p=0.053 for group 2 vs. group 3). In side-bending tests, the mean maximum moment of force was 34.63 Nm, 49.91 Nm, and 49.29 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; no significant difference was observed between groups 2 and 3). When the two bending tests were evaluated together, only the mean moment of forces of groups 1 and 3 were statistically different (p=0.006). There was no difference between any groups in terms of the deformity at the time of the maximum moment of force. Oblique screw placement in two planes increases the strength of the plate-screw fixation under bending forces; however, there is no relationship between deformity and increased strength of fixation.

European Journal of Trauma and Emergency Surgery

Introduction We prospectively examined the effect of pedicle screw placement at a young age ( Met... more Introduction We prospectively examined the effect of pedicle screw placement at a young age ( Methods Patients with early-onset deformity who received pedicle screw placement before the age of 5 years and had preoperative and final follow-up axial imaging were included. To increase sample size, patients who had the same criteria but with no preoperative axial images were also included. Anteroposterior and transverse diameters of the canal and pedicle length were measured on axial images cutting through the middle of the pedicle (figures 1 and 2). Results 13 patients (five male, eight female) met inclusion criteria. Average age at surgery was 46·6 months (29–60), and average follow-up 49·8 months (24–82). 77 instrumented and 32 non-instrumented levels were studied. The table summarises measurements. In the nine patients without preoperative axial imaging, pedicle lengths and canal diameters seemed to accord with previously published normative morphological data for this age group. Co...

The Journal of trauma

The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion wo... more The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion would change the strength of the fixation to bending forces and whether any relationship existed between deformity and increased strength of fixation. Rear leg tibias from 2-year to 3-year-old sheep were affixed with the help of a custom-made guide to a six-hole dynamic compression plate and divided into three groups. In group 1, fixation was performed using screws perpendicular to the plate axis in two planes. In group 2, screws were placed at a 20-degree angle to the axis of the shaft and perpendicular to the transverse plane. In group 3, the screws were placed at a 20-degree angle to the shaft axis and 7 degrees on the transverse plane. Gap-close bending and side-bending tests were performed in a three-point bending fashion. The maximum moment of force and deformation at the time of the failure was analyzed. In gap-close bending tests, mean maximum moment of forces for groups 1, 2, and ...

Eklem hastaliklari ve cerrahisi = Joint diseases & related surgery, 2017

This study aims to retrospectively evaluate and compare the mid-term clinical follow-up results o... more This study aims to retrospectively evaluate and compare the mid-term clinical follow-up results of patients who were treated with open or closed reduction due to carpometacarpal (CMC) fracture dislocation. Medical charts of 15 patients (1 male, 14 females; mean age 32.5±10.5 years; range 18 to 55 years) who were operated for fourth and fifth finger CMC fracture dislocations were examined. Patients were divided into two groups according to applied treatment as closed reduction and percutaneous pinning (CRPP, n=6) and open reduction and percutaneous pinning (ORPP, n=9). Patients were assessed by a hand therapist blinded to the treatment groups. Patients were compared in respect of visual analog scale (VAS), Quick Disabilities of the Arm, Shoulder and Hand (Q-DASH) scores, and grip strength. Complications were recorded. Mean VAS values of ORPP group and CRPP group were 2.33±0.50 and 1.67±0.52, respectively. Mean Q-DASH values of ORPP group and CRPP group were 13.63±3.21 and 9.05±2.36, ...

Journal of Orthopaedic Surgery and Research

Background: EFECE systems are newly defined internal fixation systems, which are suitable for pat... more Background: EFECE systems are newly defined internal fixation systems, which are suitable for patella fracture fixation. The aim of this study was to compare the fixation strength of EFECE Systems with tension band wiring for transverse patellar fracture simulation on fresh frozen cadaver models. Methods: Quadriceps tendon-patella-patellar tendon (QT-P-PT) complex was prepared from human cadavers. After simulation of a transverse patella fracture, in group 1, 5 patella were fixed with a pair of 1.2 mm EFECE wires and 4 EFECE devices. In group 2, 5 patella were fixed with a pair of 1.2 mm Kirschner wires (K-wire) and a cerclage wire according to the tension band technique. Using a testing device with custom-made jaws, increasing distraction force was applied to these QT-P-PT complexes. Extension of these complexes with the distraction forces was observed. The maximum distraction force and the elongation during maximum force were evaluated. Results: After 5 experiments with the EFECE systems, there was no EFECE wire breakage or EFECE wire-EFECE device catching failure. The median maximum force was 740 N (720-810 N). During maximum distraction force the median extension was 2.5 mm (1.6-2.5 mm). After 5 experiments with the tension band technique, there was no Kwire breakage. The median maximum force was 330 N (240-510 N). During this maximum distraction force the median extension was 3.4 mm (2.2-3.8 mm). Conclusions: Based on the biomechanical advantages, patella fracture treatment with EFECE systems may constitute a reasonable alternative in the treatment of patella fractures.

Background EFECE Systems are newly-defined internal fixation systems, which are suitable for pate... more Background EFECE Systems are newly-defined internal fixation systems, which are suitable for patella fracture fixation. The aim of this study was to compare the fixation strength of EFECE Systems with tension band wiring for transverse patellar fracture simulation on fresh frozen cadaver models.Methods Quadriceps tendon-patella-patellar tendon (QT-P-PT) complex was prepared from human cadavers. After simulation of a transverse patella fracture, in Group 1, 5 patella were fixed with a pair of 1.2 mm EFECE wires and 4 EFECE devices. In Group 2, 5 patella were fixed with a pair of 1.2 mm Kirschner wires (K-wire) and a cerclage wire according to the tension band technique. Using a testing device with custom-made jaws, increasing distraction force was applied to these QT-P-PT complexes. Extension of these complexes with the distraction forces was observed. The maximum distraction force and the elongation during maximum force were evaluated.Results After 5 experiments with the EFECE Syste...

The Journal of Trauma: Injury, Infection, and Critical Care, 2011

The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion wo... more The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion would change the strength of the fixation to bending forces and whether any relationship existed between deformity and increased strength of fixation. Rear leg tibias from 2-year to 3-year-old sheep were affixed with the help of a custom-made guide to a six-hole dynamic compression plate and divided into three groups. In group 1, fixation was performed using screws perpendicular to the plate axis in two planes. In group 2, screws were placed at a 20-degree angle to the axis of the shaft and perpendicular to the transverse plane. In group 3, the screws were placed at a 20-degree angle to the shaft axis and 7 degrees on the transverse plane. Gap-close bending and side-bending tests were performed in a three-point bending fashion. The maximum moment of force and deformation at the time of the failure was analyzed. In gap-close bending tests, mean maximum moment of forces for groups 1, 2, and 3 was 51.90 Nm, 67.47 Nm, 82.05 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; p=0.053 for group 2 vs. group 3). In side-bending tests, the mean maximum moment of force was 34.63 Nm, 49.91 Nm, and 49.29 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; no significant difference was observed between groups 2 and 3). When the two bending tests were evaluated together, only the mean moment of forces of groups 1 and 3 were statistically different (p=0.006). There was no difference between any groups in terms of the deformity at the time of the maximum moment of force. Oblique screw placement in two planes increases the strength of the plate-screw fixation under bending forces; however, there is no relationship between deformity and increased strength of fixation.

Turkiye Klinikleri Journal of Neurosurgery Special Topics, 2011

Journal of Spinal Disorders and Techniques, 2015

Retrospective cohort. The purpose of this study is to compare the anterior-posterior surgery to p... more Retrospective cohort. The purpose of this study is to compare the anterior-posterior surgery to posterior-only vertebra resection for congenital kyphoscoliosis in pediatric patients. Vertebral column resection is a very powerful correction technique mainly used in the treatment of severe and rigid spinal deformities. The technique can be applied with combined anterior and posterior vertebral column resection (APVCR) or posterior-only vertebral column resection (PVCR) approaches. PVCR has gained popularity recently due to several apparent advantages, but APVCR is still believed by some to be a viable alternative, despite the use of an anterior exposure. A retrospective chart and radiographic review was performed including the patients with congenital kyphoscoliosis up to 16 years of age who were operated on by a single senior surgeon in our department after 2005. The data included surgical time, estimated blood loss, duration of hospital and postoperative intensive care unit stay, intraoperative and postoperative complications. Preoperative, postoperative, and follow-up radiographs were evaluated for scoliosis, kyphosis, and spinal balance. Twenty-six patients (20 girls, 6 boys) met the inclusion criteria. APVCR was performed on 17 (median age, 13.2 y) and PVCR on 9 (median age, 10.7 y). Scoliosis correction at the time of last follow-up was 54.3% and 52.6% for APVCR and PVCR, respectively, whereas the average kyphosis correction was 25.4 degrees in APVCR and 30.1 degrees in PVCR group. Surgical time, hospital stay, and estimated blood loss were all significantly higher in the APVCR group, whereas the complication rates were similar. No neurological or vascular complications were encountered. This study showed that although the operative time and surgical blood loss were higher with APVCR, there were no major complications and the radiologic outcomes were similar between APVCR and PVCR. APVCR should be considered as an acceptable technique especially in deformities where PVCR would be technically difficult or at the beginning of the spine surgeon's learning curve. Level III.

Acta orthopaedica et traumatologica turcica, 2015

The aim of this study was to determine the effect of pentoxifylline (PTX) on angiogenesis and the... more The aim of this study was to determine the effect of pentoxifylline (PTX) on angiogenesis and the healing of a critical-sized segmental defect of the radius diaphysis in a rat model, using radiological and histological grading systems. The study included 24 female Sprague-Dawley rats (weight: 300±20 g) divided into 4 groups. A critical-sized segmental defect was created in the radius diaphysis in all rats. In Group 1, morcellized iliac crest autografts were used to fill the segmental bone defect. In Group 2, segmental bone defects were filled using morcellized iliac crest autografts, and 25 mg/kg/day PTX was applied intraperitoneally. In Group 3, the segmental bone defects were not filled, and in Group 4 the segmental bone defects were left unfilled, and an intraperitoneal (IP) dose of 25 mg/kg/day PTX was applied. Rats were sacrificed at postoperative Week 8, and defects were evaluated using radiographic, histological and immunohistochemical methods. There were significant differen...

Spine, 2012

A longitudinal case study. To determine whether pedicle screws placed in an immature spine exert ... more A longitudinal case study. To determine whether pedicle screws placed in an immature spine exert effect on the continued growth of the vertebral body. Pedicle screws have revolutionized surgical treatment of spinal deformities by allowing a mode of secure fixation that provides consistently better correction rates in adults and adolescents. In the young child, however, the trajectory of pedicle screws takes them through an open physis: the neurocentral cartilage. There exists little information regarding the possible effect of pedicle screws inserted at a young age on further development of the spine and the spinal canal. Patients undergoing pedicle screw instrumentation of at least 2 levels before the age of 5 years (60 mo) for the first time for any diagnosis and who had been followed for at least 24 months were included. Measurements were performed in instrumented and adjacent noninstrumented levels without visible deformity in pre- and postoperative cross-sectional images and compared using statistical methods. Ninety segments in 15 patients met the inclusion criteria (average age at instrumentation 46.3 mo [range, 29-60 mo]). Forty segments had no screws and 50 had at least 1 screw. Pedicle length and vertebral body diameter had significantly increased in both groups, whereas spinal canal parameters did not change significantly. No significant difference was observed between the growth rates in levels with or without screws in pedicle length, vertebral body diameter, or spinal canal parameters (anterior-posterior and interpedicular diameters, and area). Pedicle screw instrumentation performed before the age of 5 years does not cause a negative effect on the growth of pedicles, the transverse plane of the vertebral body, or the spinal canal. It can be safely performed in the treatment of deformity in this age group.

Journal of Craniofacial Surgery, 2006

The congenital upper lip sinuses are rare and they have previously been reported only in 40 cases... more The congenital upper lip sinuses are rare and they have previously been reported only in 40 cases. We have presented a case report of congenital midline upper lip sinus in an elderly age. Although the treatment modality is very easy and successful in any cases, the etiology of this rare congenital situation has been obscure and further studies should be done to find out.

Acta Orthopaedica et Traumatologica Turcica, 2013

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The Journal of Trauma: Injury, Infection, and Critical Care, 2011

The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion wo... more The aim of this study was to evaluate whether plate fixation with screws in an oblique fashion would change the strength of the fixation to bending forces and whether any relationship existed between deformity and increased strength of fixation. Rear leg tibias from 2-year to 3-year-old sheep were affixed with the help of a custom-made guide to a six-hole dynamic compression plate and divided into three groups. In group 1, fixation was performed using screws perpendicular to the plate axis in two planes. In group 2, screws were placed at a 20-degree angle to the axis of the shaft and perpendicular to the transverse plane. In group 3, the screws were placed at a 20-degree angle to the shaft axis and 7 degrees on the transverse plane. Gap-close bending and side-bending tests were performed in a three-point bending fashion. The maximum moment of force and deformation at the time of the failure was analyzed. In gap-close bending tests, mean maximum moment of forces for groups 1, 2, and 3 was 51.90 Nm, 67.47 Nm, 82.05 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; p=0.053 for group 2 vs. group 3). In side-bending tests, the mean maximum moment of force was 34.63 Nm, 49.91 Nm, and 49.29 Nm, respectively (p<0.05 for group 1 vs. groups 2 and 3; no significant difference was observed between groups 2 and 3). When the two bending tests were evaluated together, only the mean moment of forces of groups 1 and 3 were statistically different (p=0.006). There was no difference between any groups in terms of the deformity at the time of the maximum moment of force. Oblique screw placement in two planes increases the strength of the plate-screw fixation under bending forces; however, there is no relationship between deformity and increased strength of fixation.