• International Journal of Concrete Structures and Materials
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• 제7권1호
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• pp.35-50
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• 2013

Rapid and effective repair methods are desired to enable quick reopening of damaged bridges after an earthquake occurs, especially for those bridges that are critical for emergency response and other essential functions. This paper presents results of tests conducted as a proof-of-concept in the effectiveness of a proposed method using externally bonded carbon fiber reinforced polymer (CFRP) composites to rapidly repair severely damaged RC columns with different damage conditions. The experimental work included five large-scale severely damaged square RC columns with the same geometry and material properties but with different damage conditions due to different loading combinations of bending, shear, and torsion in the previous tests. Over a three-day period, each column was repaired and retested under the same loading combination as the corresponding original column. Quickset repair mortar was used to replace the removed loose concrete. Without any treatment to damaged reinforcing bars, longitudinal and transverse CFRP sheets were externally bonded to the prepared surface to restore the column strength. Measured data were analyzed to investigate the performance of the repaired columns compared to the corresponding original column responses. It was concluded that the technique can be successful for severely damaged columns with damage to the concrete and transverse reinforcement. For severely damaged columns with damaged longitudinal reinforcement, the technique was found to be successful if the damaged longitudinal reinforcement is able to provide tensile resistance, or if the damage is located at a section where longitudinal CFRP strength can be developed.

• Clinics in Shoulder and Elbow
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• 제24권3호
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• pp.135-140
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• 2021

Background: We hypothesized in this study that the characteristics of retear cases vary according to surgeon volume and that surgical outcomes differ between primary and revision arthroscopic rotator cuff repair (revisional ARCR). Methods: Surgeons performing more than 12 rotator cuff repairs (RCRs) per year were defined as high-volume surgeons, and those performing fewer than 12 RCRs were considered low-volume surgeons. Of the 47 patients who underwent revisional ARCR at our clinic enrolled in this study, 21 cases were treated by high-volume surgeons and 26 cases by low-volume surgeons. In all cases, the interval between primary surgery and revisional ARCR, degree of "acromial scuffing," number of anchors, RCR technique, retear pattern, fatty infiltration, retear size, operating time, and clinical outcome were recorded. Results: During primary surgery, significantly more lateral anchors (p=0.004) were used, and the rate of use of the double-row repair technique was significantly higher (p<0.001) in the high- versus low-volume surgeon group. Moreover, the "cut-through pattern" was observed significantly more frequently among the cases treated by high- versus low-volume surgeons (p=0.008). The clinical outcomes after revisional ARCR were not different between the two groups. Conclusions: Double-row repair during primary surgery and the cut-through pattern during revisional ARCR were more frequent in the high- versus low-volume surgeon groups. However, no differences in retear site or size, fatty infiltration grade, or outcomes were observed between the groups.

• 대한관절경학회지
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• 제17권1호
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• pp.95-99
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• 2013

견관절 전방 불안정성을 야기하는 전하방 관절낭-관절와순 복합체 손상에 대해 antegrade suture passer를 이용하여 효과적으로 복원할 수 있는 관절경적 봉합술을 소개하고자 한다. 후방 삽입구를 통해 관절내 병변의 유무를 확인하고, 전상방 및 전하방 삽입구를 만든 뒤 방카트르 병변(Bankart lesion)의 확인 및 봉합 전 처치를 시행한다. 전하방 삽입구를 통하여 첫 번째 봉합 나사를 4시 반 방향에 고정한 다음 한가닥의 봉합사를 Scorpion$^{TM}$을 이용하여 5시 반 방향(우측 견관절 기준)에 있는 관절와와 분리 및 퇴축된 전하방 관절와-상완인대와 관절낭-관절와순 복합체를 약 10-15 mm 내측에서 통과시킨다. Scorpion$^{TM}$의 고리를 이용하여 통과시킨 봉합사를 삽입구로 빼낸 다음 SMC 매듭을 이용하여 봉합한다. 이후 3시 반, 2시 반 방향의 관절와에 각각 봉합 나사를 삽입하고 기존의 방법인 봉합 갈고리와 shuttle-relay technique을 이용하여 관절와순 봉합을 완성한다. 본 술기는 기존의 봉합 갈고리를 이용한 봉합술로는 어려웠던 5시 내지 5시 반 방향의 전하방 관절와-상완인대에 대한 해부학적 복원을 쉽게 얻을 수 있으며, 특히 초보자나 경험이 적은 술자에게 유용한 술식으로 사료된다.

• Clinics in Shoulder and Elbow
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• 제19권2호
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• pp.60-66
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• 2016

Background: Management of massive rotator cuff tears can be challenging because of the less satisfactory results and a higher retear rate regardless of the use of open or arthroscopic repair technique. Methods: We retrospectively analyzed 102 cases of massive rotator cuff tear treated with either open or arthroscopic repair. Open repair was performed in 38 patients; and arthroscopic repair, in 64 patients. The mean age at the time of surgery was 59.7 years in the open group and 57.6 years in the arthroscopic group. Results: The Constant score increased from the preoperative mean of 55.9 to 73.2 at the last follow-up in the open repair group and from 53.8 to 67.6 in the arthroscopic repair group (p<0.001 and <0.001, respectively). The University of California at Los Angeles (UCLA) score increased from a preoperative mean of 17.7 to 30.8 at the last follow-up in the open group and from 17.5 to 28.7 in the arthroscopic group (p<0.001 and <0.001, respectively). No statistically significant difference in the Constant and UCLA scores was observed between the two groups at the last follow-up (p=0.128 and 0.087, respectively). Retear was found in 14 patients (36.8%) in the open group and 39 patients (60.9%) in the arthroscopic group (p=0.024). Conclusions: Open and arthroscopic repairs of massive rotator cuff tears may provide satisfactory clinical results with no significant difference. However, a significantly lower retear rate was observed for the open repair group compared with the arthroscopic repair group.

• 대한관절경학회지
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• 제11권1호
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• pp.63-68
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• 2007

목적: 전방 십자 인대 손상과 동반된 외측 반월상 연골 경골 후방 부착부 완전 방사상 파열 환자에서 전외측 및 전내측 도달법을 통한 all-inside 봉합 술기를 시술하여 온 바, 이를 소개하고자 한다. 수술 술기: 관절경을 전내측 도달법으로, 봉합용 갈고리(suture hook, $Linvatec^{TM}$, Largo, Florida, USA)를 전외측 도달법으로 관절에 삽입한 상태에서 봉합용 갈고리를 틀어서 외측으로 전위된 외측 반월상 연골 후각부 파열단의 대퇴골측 면에서 경골측 면으로 수직으로 통과시킨다. 갈고리 내로 PDS No. 1 ($Ethicon^{TM}$, Somerville, NJ, USA)를 통과시킨 후 봉합용 갈고리를 빼내고 전외측 도달법 입구로 봉합사의 양끝을 뽑아낸다. MAXON 2-0 ($Syneture^{TM}$, Norwalk, Connecticut, USA)를 봉합용 갈고리를 이용하여 경골 부착부 파열단 경골측 면에서 대퇴골측 면으로 봉합사를 수직으로 통과시켜 양끝을 전외측 도달법 입구로 빼내어 두 봉합사의 경골 측 끝 중 PDS를 MAXON에 결찰하여 MAXON의 대퇴골측 끝을 전외측 도달법으로 당겨 이를 PDS로 교체한 뒤 SMC(Samsung Medical Center) knot를 이용하여 결찰한다. 결론: 본 술기를 시행하여 외측 반월상 연골 후방 부착부 파열을 해부학적으로 봉합할 수 있으며 또한 반월상 연골의 연골 장력(hoop tension)을 효과적으로 회복시켜 줄 수 있을 것으로 생각된다.

• Clinics in Shoulder and Elbow
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• 제13권2호
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• pp.181-187
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• 2010

목적: 회전근 개 전층 중파열, 대파열 환자에 대하여 관절경적 교량형 봉합 술식을 시행한 후 임상 결과를 분석 보고하고자 하였다. 대상 및 방법: 2007년 11월부터 2008년 10월까지 회전근 개 전층 중파열, 대파열을 관절경적 교량형 봉합 술식으로 치료받은 90예를 대상으로 하였고, 평균 추시 기간은 15개월 (12~23개월)이었다. 파열의 크기는 중파열이 43예, 대파열이 47예였다. 술 전 및 최종 추시 시 KSS, ASES, UCLA, Visual Analogue Scale (VAS)를 이용한 기능평가를 시행하였다. 결과: 휴식 및 운동 시 평균 VAS 점수는 각각 수술 전 2.56, 6.94에서 최종 추시 시 0.96, 1.70으로 현저한 감소를 보였다. UCLA 점수는 수술 전 평균 17.08점에서 최종 추시 시 31.17점으로 향상되었으며, 최우수가 31예 (34%), 양호가 49예 (54%), 불량이 10예 (12%)였다. 최종 추시 시 60세 이하인 경우 31.47점, 61세 이상인 경우 30.69점이었으며 (p=0.344), 중파열인 경우 31.23점, 대파열인 경우 31.11점이었고 (p=0.924), 비외상군이 31.10점, 외상군이 31.23점이었다 (p=0.929). 결론: 회전근 개 전층 중파열, 대파열 환자에서 관절경적 교량형 봉합 술식을 시행하여 동통의 감소 및 견관절 기능 향상의 우수한 결과를 얻을 수 있어 믿을만한 수술적 방법 중 하나라고 생각한다. 수술 당시 연령, 외상력 유무는 치료 결과에 큰 영향을 주지 않았다.

• 대한두개안면성형외과학회지
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• 제17권3호
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• pp.146-153
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• 2016

Background: Restoring the orbital cavity in large blow out fractures is a challenge for surgeons due to the anatomical complexity. This study evaluated the clinical outcomes and orbital volume after orbital wall fracture repair using a rapid prototyping (RP) technique and intraoperative navigation system. Methods: This prospective study was conducted on the medical records and radiology records of 12 patients who had undergone a unilateral blow out fracture reconstruction using a RP technique and an intraoperative navigation system from November 2014 to March 2015. The surgical results were assessed by an ophthalmic examination and a comparison of the preoperative and postoperative orbital volume ratio (OVR) values. Results: All patients had a successful treatment outcome without complications. Volumetric analysis revealed a significant decrease in the mean OVR from $1.0952{\pm}0.0662$ (ranging from 0.9917 to 1.2509) preoperatively to $0.9942{\pm}0.0427$ (ranging from 0.9394 to 1.0680) postoperatively. Conclusion: The application of a RP technique for the repair of orbital wall fractures is a useful tool that may help improve the clinical outcomes by understanding the individual anatomy, determining the operability, and restoring the orbital cavity volume through optimal implant positioning along with an intraoperative navigation system.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제29권2호
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• pp.174-181
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• 2007

Today, endoscopic procedures are common in diagnostic and other surgical procedures, with endoscopically enhanced and magnified images permitting surgical access through minimal incisions. This has expanded the treatment options for many difficult anatomic sites, and the endoscope facilitated safe anatomic reduction and fixation. The use of the endoscope may reduce the disadvantages of open fracture repair and should be considered for broad application in the treatment of displaced facial bone fractures. Optical endoscopic magnification minimizes the disadvantages associated with open surgical repair, including the risk of facial nerve injury and external facial scarring, and no postoperative complications have been attributable to the endoscopic approach. This technique was used in 14 patients treated at Ulsan University Hospital, Korea, from September 2004 to August 2006, including six mandibular subcondyle fractures, five blowout fractures and three zygomaticomaxillary complex (ZMC) fractures. Careful preoperative evaluation and proper surgical technique were essential to achieve optimal results in the selected patients.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.638-641
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• 2006

본 연구에서는 UDPSC(Up-Down Precast Concrete) 교량을 유지관리하는데 발생되는 비용인 유지관리 비용의 산출 방법에 대하여 제안하였다. 신공법을 이용한 교량인 UDPSC 교량의 시공실적은 2000년도 이후 공사가 완료된 교량만 109건에 이르며, 2006년 현재 37건의 공사가 진행중에 있고 설계납품도 194건에 이른다. 이러한 시공실적에도 불구하고 신공법의 교량이라는 이유로 사용기간이 길지 않아 유지관리비에 대한 실적 데이터의 축적이 이루어지지 않았다. 때문에 건설교통부의 유지관리비 산출지침과 선행연구 분석을 통해 교량의 주요자재별 내구연한을 판단하여 유지관리비를 산출하는 방법을 제안하였으며, 실제로 시공된 교량을 토대로 유지관리비용을 산출하였다.

• 대한족부족관절학회지
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• 제10권2호
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• pp.259-263
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• 2006

The acute Achilles tendon rupture usually occurs to the people who participate in sports-related activities between 30 and 40 years of age. Recently surgical repair is the standard treatment in acute Achilles tendon rupture. After the Achilles tendon rupture in the left ankle, a 30-years old young man had been suffered from re-rupturing within three months after the primary repair. 2 years later, right-side Achilles tendon was reruptured after primary repair consequently. In the revision surgery, we performed V-Y advancement of the gastrocnemius-soleus fascia and reinforcement of the semitendinosus tendon. None of the English-literature was reported about using the semitendinosus tendon in revision surgery of the Achilles tendon retear previously. Therefore, we report this case and surgical technique because of the simple technique and the excellent results.