서울 제3기 지하철 9호선의 공조 환기설비

이동오,Lee, D.O. 대한설비공학회 1998 설비저널 Vol.27 No.2

편평족의 치료

이동오,정홍근,Lee, Dong-Oh,Jung, Hong-Geun 대한족부족관절학회 2016 대한족부족관절학회지 Vol.20 No.1

Flatfoot deformity, defined as loss of medial longitudinal arch, sometimes involves symptoms such as medial arch pain or Achilles tendon tightening, etc. Whether the etiology of deformity is congenital or acquired, i.e., posterior tibial tendon dysfunction, symptoms are largely resolved with conservative treatment including medication, orthoses, and activity modification. Surgery should be considered in cases of failure of conservative treatment and clinicians can select an appropriate technique among many surgical options including calcaneal osteotomy or flexor digitorum longus tendon transfer. Principles of corrective surgery include the recovery of alignment and the preservation of joint motion.

나사 파단 예방을 위해 새로 디자인한 경비 인대 결합 나사의 효용성: 생역학 연구

이동오,송상헌 대한족부족관절학회 2020 대한족부족관절학회지 Vol.24 No.2

Purpose: Fatigue breakage of cortical screws sometimes occurs after syndesmosis fixation, regardless of the period of screw retention. This study compared the fatigue strength of a novel screw design to conventional cortical screws in the fixed state of syndesmosis. Materials and Methods: Twelve sawbone models were tested mechanically to determine the fatigue strength of three screw designs. The first group was composed of cortical screws, while the second and third groups were newly-designed screws. The second group was composed of screws with a 2.4-mm diameter thread-free portion of the mid-shank while the third group had a 2.0-mm diameter threadfree mid-shank. A 400 N load was applied repetitively to a fibula model and the number of cycles until screw failure was recorded. Four screws from each group were tested, giving a total of 12 fatigue tests. Results: The average cycles until screw failure for groups 1, 2, and 3 were 8,134, 63,186, and 2,581, respectively. The second group showed the highest fatigue strength (p=0.018). The other two screw designs showed similar fatigue strength (p=0.401). Conclusion: New screw designs with a thread-free portion in the mid-shank could reduce the occurrence of fatigue breakage after syndesmosis fixation.

Is osteoporosis a risk factor for ankle fracture?: Comparison of bone mineral density between ankle fracture and control groups

이동오,김주학,유병찬,유정현 대한골다공증학회 2017 Osteoporosis and Sarcopenia Vol.3 No.4

Objectives: There remains controversy over osteoporotic feature of the ankle. Therefore, we investigated the possibility of the existence of a relationship between axial bone mineral density (BMD) in patients with ankle fracture group with that of the normal population in Korea under control of other confounding factors such as body mass index (BMI). Methods: This study retrospectively reviewed medical records of patients who were treated in our institution from 2005 to 2015. A comparative analysis was carried out between 116 patients with ankle fracture (ankle fracture group) and 113 patients admitted with other orthopedic reasons (control group). Sex, age, energy level of trauma, and BMI were analyzed as variables affecting axial BMD. Results: Age and sex of ankle fracture group were not different from them of control group (P ¼ 0.968 and P ¼ 0.870, respectively). BMI of ankle fracture group was higher than that of control (P ¼ 0.029). The other variables showed no differences between the 2 groups. The energy level of trauma in ankle fracture group was related to only BMI (P ¼ 0.013). Conclusions: Axial BMD of ankle fracture patients showed no difference from that of a control group in Korean population. The occurrence of ankle fracture is affected by only BMI rather than axial BMD. Evaluation of osteoporosis for patients with ankle fracture should be considered separately. © 2017 The Korean Society of Osteoporosis. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

에어백 원단의 열화특성 분석 및 가속열화 시험 모델 연구

이동오(Dongoh Lee),송지운(Jiwoon Song),이석민(Seok Min Lee),박해권(Hae Kwon Park),이규상(Gyu Sang Lee) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7

거골 골연골병변의 자연 경과

경민규,이동오,이동연 대한족부족관절학회 2020 대한족부족관절학회지 Vol.24 No.2

Many articles on operative treatment strategies for osteochondral lesions of the talus (OLT) have been published. On the other hand, there are only a few reports on the conservative treatment of OLT. Understanding the natural history of OLT is essential to establishing the correct treatment. Conservative treatment might lead to comparable clinical outcomes compared to the current options of the operative treatment in isolated OLT lesions. OLT lesions can be divided into two (or possibly three) types. Hence, the prognosis and outcome of certain operative treatments should be evaluated further. The prognosis of OLT combined with instability or malalignment appears poorer than that of isolated OLT lesions. Therefore, concomitant pathologies should be evaluated together when treating patients with OLT.

요내반족 변형에 대한 재건수술의 임상적 및 방사선학적 결과 분석

정홍근,박재용,이동오,엄준상,정승희,Jung, Hong-Geun,Park, Jae-Yong,Lee, Dong-Oh,Eom, Joon-Sang,Chung, Seung-Hee 대한족부족관절학회 2014 대한족부족관절학회지 Vol.18 No.2

Purpose: Reconstructive surgeries for equinocavovarus foot deformities are quite variable, including hind-midfoot osteotomy or arthrodesis, soft tissue procedure, tendon transfers, etc. Comprehensive evaluation of the deformity and its etiology is mandatory for achievement of successful deformity correction. Few studies in this field have been reported. We report on the clinical and radiographic outcome of reconstruction for cavovarus foot deformities. Materials and Methods: The study is based on 16 feet with cavovarus foot deformities that underwent bony and soft tissue reconstructive surgery from 2004 to 2008. We evaluated the etiologies, varieties of surgical procedures performed, pain score, functional scores, and patient satisfaction and measured the radiographic parameters. Results: The average age at the time of surgery was 39.4 years old, with a male/female ratio of 9/4 and an average follow-up period of 23.9 months (range, 12~49 months). The etiologies of the cavovarus deformity were idiopathic 7 feet, residual poliomyelitis 5 feet, Charcot-Marie-Tooth disease 2 feet, and Guillain-Barre syndrome and hemiplegia due to cerebrovascular accident sequela 1 foot each. Lateral sliding calcaneal osteotomies were performed in 12 feet (75%), followed by Achilles tendon lengthening and plantar fascia release in 11 feet (69%), and first metatarsal dorsiflexion osteotomy/arthrodesis and tendon transfer in 10 feet (63%). Visual analogue scale pain score showed improvement, from an average of 4.2 to 0.5 points. American Orthopaedic Foot and Ankle Society ankle-hindfoot score showed significant improvement, from 47.8 to 90.0 points (p<0.05). All patients were satisfied. Ankle range of motion improved from $27.5^{\circ}$ to $46.7^{\circ}$. In radiographic measurements, calcaneal pitch angle improved from $19.1^{\circ}$ to $15.8^{\circ}$, Meary angle from $13.0^{\circ}$ to $9.3^{\circ}$, Hibb's angle from $44.3^{\circ}$ to $37.0^{\circ}$, and tibio-calcaneal axis angle from varus $17.5^{\circ}$ to varus $1.5^{\circ}$ Conclusion: We achieved successful correction of cavovarus foot deformities by performing appropriate comprehensive reconstructive procedures with improved functional, radiographic measures and high patient satisfaction.

소아 유연성 편평족에서 Kalix® 족근동 기구를 이용한 거골하 관절 제동술

황석민,엄준상,이동오,이종수,김성욱,원태구,정홍근 대한정형외과학회 2017 대한정형외과학회지 Vol.52 No.6

Purpose: The purpose of this study was to evaluate the radiographic and clinical outcomes of subtalar arthroereisis as a method of treatment for pediatric flexible flatfoot. Materials and Methods: We retrospectively investigated 14 feet among 10 patients with flexible flatfoot, who were treated with a subtalar arthroereisis using a sinus tarsi implant between March 2007 and June 2012. Radiographically, the talo-1st metatarsal angle, talar declination, and calcaneal pitch angle have all been measured on lateral radiographs. The talo-navicular coverage angle and talo-1st metatarsal angle was measured on anteroposterior (AP) radiographs and tibio-calcaneal angle was assessed by hindfoot alignment view. Visual analogue scale (VAS) pain scores and the American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot scores were used for clinical evaluation. Results: The mean follow-up was 48.7 months (16–98 months), and the mean age was 11.6 years (6–19 years). Radiographically, the mean pre-operative and postoperative values measured by the lateral foot radiograph were -25.1° and -7.5° for talo-1st metatarsal angle, 37.4° and 23.2° for talar declination, and 8.3° and 15.0° for calcaneal pitch angle, respectively. The mean preoperative and postoperative values measured by foot AP radiograph were 23.0° and 11.9° for talo-navicular coverage angle and 17.2° and 9.0° for talo-1st metatarsal angle, respectively. Moreover, tibio-calcaneal angle improved from valgus 17.4° on average to 4.5° on average. Clinically, the VAS score and AOFAS score was improved from 5.8 to 1.5 and from 61.8 to 90.4, respectively. Complication was sinus tarsi pain that occurred in 5 cases (35.7%). Conclusion: We achieved a satisfactory correction of pediatric flexible flatfoot deformities via subtalar arthroereisis, using a sinus tarsi implant with favorable radiographic and clinical measures. However, high potential complication rate of postoperative sinus tarsi pain on weight-bearing should carefully be considered. 목적: 소아의 유연성 편평족에 대한 거골하 관절 제동술의 방사선적 및 임상적 결과를 평가하고자 하였다. 대상 및 방법: 2007년 3월부터 2012년 6월까지 건국대학교병원에서 편평족으로 진단 후 거골하 관절 제동술을 시행받은 10명, 14예의 환자를 대상으로 하였다. 방사선적으로는 측면 방사선 사진을 통하여 거골-제1 중족골 간 각, 거골 수평면각 및 종골 경사각을 측정하였다. 전후면 방사선 사진을 통하여 거주상골 피복각 및 거골-제1 중족골 간 각을 측정하였고, 후족부 정렬 사진을 통하여 경골-종골각을 측정하였다. 임상적 평가로는 수술 전후의 visual analogue scale (VAS) 통증 지수와 미국 정형외과 족부족관절학회(American Orthopaedic Foot and Ankle Society, AOFAS) 기능 점수를 조사하였다. 결과: 평균 추시 기간은 48.7개월(16-98개월)이었으며, 평균 연령은 11.6세(6-19세)였다. 방사선적 측면 족부 방사선 사진상에서 거골-제1 중족골 간 각은 술 전 평균 -25.1도에서 술 후 평균 -7.5도, 거골 수평면각은 술 전 평균 37.4도에서 술 후 평균 23.2도 및 종골 경사각은 술 전 평균 8.3도에서 술 후 평균 15.0도로 각각 향상 측정되었다. 전후면 방사선 사진에서 측정한 거주상골 피복각은 술 전 평균 23.0도에서 술 후 평균 11.9도로, 거골-제1 중족골 간 각은 술 전 평균 17.2에서 술 후 평균 9.0도로 감소하였다. 또한 후족부 정렬상 경골-종골 각은 술 전 평균 외반 17.4도에서 술 후 평균 외반 4.5도로 호전되었다. 임상적으로는 VAS 통증 점수는 술 전 5.8점에서 술 후 1.5점으로, AOFAS 점수는 술 전 61.8점에서 술 후 90.4점으로 향상되었다. 합병증으로는 족근동 통증이 5예(35.7%)에서 발생하였다. 결론: 소아의 유연성 편평족 환자에서 족근동 삽입물을 이용한 거골하 관절 제동술을 시행하여 방사선적 및 임상적으로 우수한 결과를 얻었고, 편평족 변형에 대해 만족스러운 교정을 얻을 수 있었다. 하지만 수술 후 체중 부하 시 족근동 통증의 높은 발생 가능성에 대해서는 유념하여야 할 것이다.

스마트 인솔의 족저압 측정 결과에 대한 타당도 및 신뢰도 평가

이동연,강호원,안예린,김대유,이동오,박길영 대한족부족관절학회 2022 대한족부족관절학회지 Vol.26 No.3

Purpose: Smart insoles are wearable devices that are inserted into shoes. Smart insoles with built-in pressure and acceleration sensors can measure the plantar pressure, stride length, and walking speed. This study evaluated the validity and reliability of the plantar pressure measurements of smart insoles during walking on flat ground. Materials and Methods: Twenty one subjects were included in this study. After wearing smart insoles, I-SOL® (Gilon, Seongnam, Korea), the subjects walked a 10 m corridor six times at a rate of 100 steps/min, and the middle three steps, free from direction changes, were chosen for data analysis. The same protocol was repeated after wearing Pedar-X (Novel Corporation, Munich, Germany), an insoletype plantar pressure measurement equipment with proven validity. The average maximum pressure (Ppeak, kPa) and the time at which Ppeak appeared (Ptime, %stride) were calculated for each device. The validity of smart insoles was evaluated by using the interclass correlation coefficient (ICC) of Ppeak and Ptime between the two instruments, and Cronbach’s alpha was obtained from the Ppeak values to evaluate the reliability. Results: The ICC of Ppeak was 0.651 (good) in the hallux, 0.744 (good) in the medial forefoot, 0.839 (excellent) in the lateral forefoot, and 0.854 (excellent) in the hindfoot. The ICC of Ptime showed 0.868 (excellent) in the hallux, 0.892 (excellent) in the medial forefoot, 0.721 (good) in the lateral forefoot, and 0.832 (excellent) in the hindfoot. All ICC values showed good or excellent results. The Cronbach’s alpha of Ppeak measured in the smart insoles was 0.990 in the hallux, 0.961 in the medial forefoot, 0.973 in the lateral forefoot, and 0.995 in the hindfoot; all indicated excellent reliability in all areas. Conclusion: The plantar pressure measurements of smart insoles during walking on a flat ground showed validity compared to Pedar-X, and high reliability after repeated measurements.

수술 후 컴퓨터 단층촬영을 이용한 관절 내 종골 골절의 정복과 임상 결과 간의 연관성 분석

엄준상,주영득,김성준,신민호,이동오,정홍근,Eom, Joon-Sang,Joo, Young-Deuk,Kim, Seong-Jun,Shin, Min-Ho,Lee, Dong-Oh,Jung, Hong-Geun 대한족부족관절학회 2014 대한족부족관절학회지 Vol.18 No.4

Purpose: We evaluated the correlation of postoperative clinical outcomes and radiologic findings using computed tomography and simple X-ray in intra-articular calcaneal fractures. Materials and Methods: The current study is based on 41 feet, 38 patients with displaced intra-articular fracture who underwent surgical treatment with at least one year of follow-up. Evaluation of clinical outcome included American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot score, visual analogue scale (VAS) score, and subjective satisfaction. A simple X-ray was used in evaluation of preoperative and postoperative Gissane angle, B${\ddot{O}}$hler angle, and calcaneal fracture width. Computed tomography scan was performed for evaluation of preoperative and postoperative articular step-off and articular gap in all cases. Finally, we evaluated the correlation of the postoperative clinical outcomes and radiologic findings based on the measurement. Results: The average postoperative AOFAS score and VAS score was $84.1{\pm}8.5$ and $2.2{\pm}2.2$. Subjective satisfaction was excellent in 15 cases, good in 19 cases, and fair in seven cases. The average B${\ddot{O}}$hler angle was restored from $11.1^{\circ}$ to $24.7^{\circ}$(p<0.05), Gissane angle was changed from $121.0^{\circ}$ to $119.0^{\circ}$ (p>0.05), and the average width was restored from 45.8 to 35.0 mm (p<0.05). The average articular step-off and gap were decreased from 6.3 to 2.0 mm and from 11.1 to 4.6 mm, respectively (p<0.05). No significant correlations were observed between the clinical outcome and Gissane angle, B${\ddot{O}}$hler angle, and width, and there was no significant correlation between the clinical outcome and Sanders classification. However, postoperative articular step-off showed correlation with VAS and AOFAS score and articular gap showed correlation with VAS score. Conclusion: The clinical outcome did not show correlation with B${\ddot{O}}$hler angle and Gissane angle but did show correlation with anatomical reduction of the posterior facet joint.