• 대한정형외과학회지
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• 제52권1호
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• pp.7-14
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• 2017

목적: 쇄골 간부 골절에서 경피적 골수강내 금속핀 고정술을 시행 후 결과를 보고하고자 한다. 대상 및 방법: 쇄골 간부 골절로 내원한 환자 중 2004년 1월부터 2014년 6월까지 경피적 골수강내 금속핀 고정술을 시행한 135예를 대상으로 하였다. 평균 추시 기간은 15개월(12-24개월)이었다. 기능적 평가로 Disabilities of the Arm, Shoulder and Hand(DASH) score와 Constant score, 임상적 평가로 쇄골의 단축, 수술 반흔의 길이, 수술 시간 및 Kang's criteria에 등에 의하여 분석하였다. 결과: 방사선적 골유합 기간은 평균 11.6주(8-16주), DASH score는 평균 11.8점, Constant score는 평균 91.2점이었다. 임상적 결과로 쇄골의 단축은 평균 20 mm 이하였으며, 수술 반흔의 길이는 평균 1.2 cm (0.7-1.5 cm), 수술 시간은 평균 18분(10-35분)이었으며 Kang's criteria를 기준으로 한 임상적 치료 결과는 우수 이상이 총 131예(97.0%)로 만족할 만한 치료 결과를 보였다. 합병증으로는 3예의 핀 전이, 그 중 2예에서 불유합이 관찰되었다. 결론: 쇄골 간부 골절에서 시도한 경피적 골수강내 금속핀 고정술은 유용한 수술법이라 생각된다.

• Journal of Korean Neurosurgical Society
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• 제50권3호
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• pp.166-172
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• 2011

Objective : The intralaminar screw (ILS) fixation technique offers an alternative to pedicle screw (PS) and lateral mass screw (LMS) fixation in the C7 spine. Although cadaveric studies have described the anatomy of the pedicles, laminae, and lateral masses at C7, 3-dimensional computed tomography (CT) imaging is the modality of choice for pre-surgical planning. In this study, the goal was to determine the anatomical parameter and optimal screw trajectory for ILS placement at C7, and to compare this information to PS and LMS placement in the C7 spine as determined by CT evaluation. Methods : A total of 120 patients (60 men and 60 women) with an average age of $51.7{\pm}13.6$ years were selected by retrospective review of a trauma registry database over a 2-year period. Patients were included in the study if they were older than 15 years of age, had standardized axial bone-window CT imaging at C7, and had no evidence of spinal trauma. For each lamina and pedicle, width (outer cortical and inner cancellous), maximal screw length, and optimal screw trajectory were measured, and the maximal screw length of the lateral mass were measured using m-view 5.4 software. Statistical analysis was performed using Student's t-test. Results : At C7, the maximal PS length was significantly greater than the ILS and LMS length (PS, $33.9{\pm}3.1$ mm; ILS, $30.8{\pm}3.1$ mm; LMS, $10.6{\pm}1.3$; p<0.01). When the outer cortical and inner cancellous width was compared between the pedicle and lamina, the mean pedicle outer cortical width at C7 was wider than the lamina by an average of 0.6 mm (pedicle, $6.8{\pm}1.2$ mm; lamina, $6.2{\pm}1.2$ mm; p<0.01). At C7, 95.8% of the laminae measured accepted a 4.0-mm screw with a 1.0 mm of clearance, compared with 99.2% of pedicle. Of the laminae measured, 99.2% accepted a 3.5-mm screw with a 1.0 mm clearance, compared with 100% of the pedicle. When the outer cortical and inner cancellous height was compared between pedicle and lamina, the mean lamina outer cortical height at C7 was wider than the pedicle by an average of 9.9 mm (lamina, $18.6{\pm}2.0$ mm; pedicle, $8.7{\pm}1.3$ mm; p<0.01). The ideal screw trajectory at C7 was also measured ($47.8{\pm}4.8^{\circ}$ for ILS and $35.1{\pm}8.1^{\circ}$ for PS). Conclusion : Although pedicle screw fixation is the most ideal instrumentation method for C7 fixation with respect to length and cortical diameter, anatomical aspect of C7 lamina is affordable to place screw. Therefore, the C7 intralaminar screw could be an alternative fixation technique with few anatomic limitations in the cases when C7 pedicle screw fixation is not favorable. However, anatomical variations in the length and width must be considered when placing an intralaminar or pedicle screw at C7.

• Clinics in Shoulder and Elbow
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• 제27권1호
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• pp.88-107
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• 2024

The aim of this systematic review was to collect evidence on the following 10 technical aspects of glenoid baseplate fixation in reverse total shoulder arthroplasty (rTSA): screw insertion angles; screw orientation; screw quantity; screw length; screw type; baseplate tilt; baseplate position; baseplate version and rotation; baseplate design; and anatomical safe zones. Five literature libraries were searched for eligible clinical, cadaver, biomechanical, virtual planning, and finite element analysis studies. Studies including patients >16 years old in which at least one of the ten abovementioned technical aspects was assessed were suitable for analysis. We excluded studies of patients with: glenoid bone loss; bony increased offset-reversed shoulder arthroplasty; rTSA with bone grafts; and augmented baseplates. Quality assessment was performed for each included study. Sixty-two studies were included, of which 41 were experimental studies (13 cadaver, 10 virtual planning, 11 biomechanical, and 7 finite element studies) and 21 were clinical studies (12 retrospective cohorts and 9 case-control studies). Overall, the quality of included studies was moderate or high. The majority of studies agreed upon the use of a divergent screw fixation pattern, fixation with four screws (to reduce micromotions), and inferior positioning in neutral or anteversion. A general consensus was not reached on the other technical aspects. Most surgical aspects of baseplate fixation can be decided without affecting fixation strength. There is not a single strategy that provides the best outcome. Therefore, guidelines should cover multiple surgical options that can achieve adequate baseplate fixation.

• Journal of Korean Neurosurgical Society
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• 제44권1호
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• pp.15-18
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• 2008

Objective : C2 laminar screw fixation is considered as an excellent alternative to Magerl's transfacetal approach or Harms construct for the atlantoaxial stabilization. However, to our knowledge, there is no report on the feasibility of the new approach to Korean population. We investigated morphometric parameters of the dorsal arch of the C2 to provide the quantitative data for the feasibility of laminar screw fixation. Methods : One-hundred-and-two patients' cervical computed tomography had been reconstructed and investigated on the anatomical parameters related with C2 laminar screw placement. Sixty patients were male and forty-two patients were female. Measurements included the laminar thickness and slope, spino-laminar angle, and maximal screw length. Results : Ages ranged from 20 to 81 and the mean age was 48.4. Mean laminar thickness was 5.7 mm (${\pm}1.0$) (5.8 mm in male and 5.4 mm in female). Fifty-one patients (50%) had a laminar thickness smaller than 5.5 mm at least unilaterally, therefore the patients were considered as inappropriate candidates for the laminar screw fixation in the smaller side of the laminae. Mean value of maximal length of screw was 33.3 mm (34.3 mm in male and 31.9 mm in female). Mean spino-laminar angle was $43.2^{\circ}$ and mean slope angle was $32.9^{\circ}$. Conclusion : Half of patients had inappropriate laminar profiles to accommodate a 3.5 mm screw in at least one side of the axis. The three-dimensional computed tomography reconstruction is mandatory for the preoperative assessment for the feasibility of the C2 lamina.

• Clinics in Shoulder and Elbow
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• 제20권1호
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• pp.37-41
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• 2017

Background: Increased frequency of comminuted clavicle mid-shaft fractures and importance of functional satisfaction through early joint exercise has resulted in higher emphasis on surgical treatments. This study aimed to evaluate the clinical radiological results of treatment of clavicle mid-shaft fractures by open reduction and internal fixation using a plate with a small incision. Methods: The subjects of this study were 80 clavicle mid-shaft fracture cases treated with internal fixation using a plate from October 2010 to July 2014. Clavicle mid-shaft fractures were internally fixated using anatomical plates or locking compression plates. Achievement of bone union, union period, and clavicle length shortening were evaluated radiologically, and clinical assessment was done by using Constant and University of California at Los Angeles (UCLA) scores. Results: All 80 cases were confirmed to have achieved bone union through radiographs with an average union period of 10.9 weeks (range: 7-18 weeks). The average clavicle length of shortening in the affected side was 1.8 mm (range: 0-17 mm). The average UCLA score and Constant score were 33.6 (range: 25-35) and 92.5 (range: 65-100), respectively. Regarding complications, four cases reported skin irritation by metal plates, and one case reported a screw insertion site fracture due to minor trauma history. Conclusions: We were able to induce successful bone union and obtain clinically satisfactory results in displaced mid-shaft fractures of the clavicle without major complications such as nonunion through treatment of internal fixation using a plate.

• 인지과학
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• 제20권3호
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• pp.291-307
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• 2009

본 연구에서는 대학생들이 어려운 글과 쉬운 글을 읽는 동안에 안구운동을 측정하였다. 비교 분석은 전반적인 수준과 어절 수준에서 이루어졌다. 전반적인 수준을 보면, 평균 고정시간은 어려운 글을 읽을 때가 217ms로 쉬운 글을 읽을 때의 190ms에 비해 길었고, 도약거리는 어려운 글을 읽을 때가 3.7자로 쉬운 글을 읽을 때의 4.8자에 비해 짧았다. 어절 수준에서는 어려운 글의 단일 고정시간(single fixation time: 227ms)과주시시간(gaze duration: 266ms)이쉬운글(각각195ms와 210ms)에서보다 더 길었다. 어려운 글과 쉬운 글 모두에서 단어 빈도 효과와 어절 길이 효과가 있었으며 빈도에 따른 고정시간의 차이와 길이에 따른 고정시간의 차이는 모두 어려운 글에서 더 크게 나타났다.

• Clinics in Shoulder and Elbow
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• 제1권1호
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• pp.51-57
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• 1998

Comminuted fracture of the distal end of the humerus in adults is very rare and difficult to treat. In operative treatment, an implant which can achieve accurate anatoraical reduction and rigid fixation is needed. But the pre­existing Y -shaped plate had wide and thick limbs and some problems in fixation for most distal humeral fractures. So we devised a modified plate which is more narrow and th1n and has a different hole distance and wing length (long lateral wing). The aim of the study was to evaluate the clinical result of this modified anatomical Y -plate. From 1991 to 1997, we treated 23 cases of distal humeral fractures using modified anatomical plate and the results were as follows. 1. Fracture type in 18 patients(78%) was C-type(C1,C2,C3) which were intraarticular and mostly displaced or comminuted. 2. Bony union was obtained in 22 patients(96%) through rigid fixation and observed radiologically at 3.5 months(2-6months) on the average. 3. In 23 patients, 19 patients(82%) showed satisfactory results after 34 months(6-73months) follow-up. So if the modified anatomical Y-plate is used in the treatment of distal humeral fracture, a satisfactory result can be obtained through a more accurate, easy, and rigid fixation than preexisting plate.

• 한국임상수의학회지
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• 제36권2호
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• pp.93-97
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• 2019

Healing of 48 cases of radial fractures in small breed dogs treated with acrylic pin external fixation was evaluated retrospectively to investigate the factors affecting the healing of radial fractures. The mean age of the subjects was 15.02 months, the mean body weight was 3.48 kg, and the mean maximum length of the radius (MLR) was 90.77 mm. External skeletal fixation frames type 1a, 2a, and 3 were used; among them type 2a was used most frequently (75%). The mean time to clinical union (TCU) was 67.17 days, and the success rate was 95.8%. Age, bodyweight, MLR, and occurrence of complications increased TCU significantly. Among complications, pin loosening, swelling of the operated forelimb tissue for more than 2 weeks, and coexistence of two or more complications increased TCU significantly (p < 0.05). There was no relationship between location of the fracture and TCU. The results of this study may be useful to predict the prognosis of radial fractures in small dogs.

• 한국작물학회지
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• 제50권2호
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• pp.125-130
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• 2005

In the absence of exogeneous nitrogen supply, evaluation of a symbiosis effectiveness of Bradyrhizobium japonicum USDA 110 in a supernodulating soybean mutant, SS2-2, its wild type, Sinpaldalkong 2, and control genotype, Jangyeobkong, was conducted in this study. Nodules in SS2-2 were initially white and similar to its wild type, Sinpaldalkong 2. At the late stage, the wild type nodules became dark pinkish by maturation, by contrast, mature nodules in SS2-2 remained light green to pinkish, indicating a lack of leghemoglobin. Tap root length was short in nodulated symbiotic SS2-2 than that of its wild type and the control genotype. Nodulated root length and nodule density on root length were significantly increased by B. japonicum inoculation, but no significant increase was observed on root length and percentage of nodulation to total root length. Regardless of Bradyrhizobium inoculation, SS2-2 showed higher nodule dry weight and higher acetylene reduction activity (ARA) when compared with its wild type and the control genotype. Inoculation of B. japonicum leaded the increase of ARA in 47 days after planting (DAP), in part because of nodule development. Supernodulating mutant, SS2-2, less responded to B. japonicum induction in terms of nitrogen fixation and nodulation characteristics than its wild type. Thus, interaction of supernodulating soybean mutant with Bradyrhizobium had less symbiotically associated response than normal nodulating soybean.

• Clinics in Shoulder and Elbow
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• 제12권1호
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• pp.33-37
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• 2009

목적: 상완골 간부 골절의 불유합에 대해 그 원인을 분석하고, 금속판 고정 및 자가골 이식술을 통한 수술적 치료의 결과를 평가하고자 하였다. 대상 및 방법: 총 18예를 대상으로 하였으며, 평균 추시 기간은 28개월이었다. 불유합에 대해 금속판 고정 및 자가골 이식술을 시행하였고, 골결손이 심한 경우 골단축술을 병행하였다. 술후 추시 단순 방사선 검사로 골유합을 확인하였고, ASES 점수 평가법을 이용하여 임상적 평가를 시행하였다. 결과: 불유합의 원인은 처음 수술시 금속판을 시행한 12예의 경우에서는 불충분한 금속판 길이가 6예, 금속판의 파손 2예, 나사못의 이완이나 파손이 2예, 감염이 1예, 정신과적 문제로 인한 환자의 불응성이 1예였고, 금속정 고정술을 시행한 3예에서는 전 예에서 골절 부위의 신연이 원인이었으며, 외고정을 시행한 3예에서는 불충분한 고정이 원인이었다. 전 예에서 골유합을 얻을 수 있었으며, 골유합까지의 기간은 평균 24주였다. 임상적 결과는 우수가 11예, 양호가 6예, 보통이 1예였다. 결론: 불유합에 대한 수술 시 불유합 부위에 존재하는 섬유조직이나 괴사된 골조직을 철저하게 제거한 후, 충분한 길이의 금속판 내고정술 및 자가골 이식술을 이용하면 만족스러운 결과를 얻을 수 있을 것으로 사료된다.