• Transactions of the KSME C: Technology and Education
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• v.1 no.2
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• pp.153-165
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• 2013

The established gait analysis studies have regarded leg as one single spring. If we can design a knee-ankle actuating mechanism as a primary actuator for supporting knee extension, it might be possible to revolutionary store or release elastic strain energy, which is consumed during the gait cycle, and as a result leg stiffness is expected to increase. An ankle joint actuating mechanism that stores and releases the energy in ankle joint is expected to support and solve excessive artificial leg stiffness caused by the knee actuator (primary actuator) to a reasonable extent. If unnecessary kinematic energy is released with the artificial speed reduction control designed to prevent increase in gait speed caused by increase in time passed, it naturally brings question to the effectiveness of the actuator. As opposed to the already established studies, the authors are currently developing knee-ankle two actuator system under the concept of increasing lower limb stiffness by controlling the speed of gait in relative angular velocity of the two segments. Therefore, the author is convinced that compensatory mechanism caused by knee actuating must exist only in ankle joint. Ankle joint compensatory mechanism can be solved by reverse-examining the change in metatarso-phalangeal joint (MTPJ) tilt angle (${\theta}_1=0^{\circ}$, ${\theta}_2=17^{\circ}$, ${\theta}_3=30^{\circ}$) and the effect of change in gait speed on knee activity.

• Journal of the Korean Orthopaedic Association
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• v.56 no.3
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• pp.277-281
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• 2021

Iliac vein compression syndrome, which results in thrombosis of the left iliac veins, was first described by May and Thurner in 1957. May-Thurner syndrome should be considered when deep vein thrombosis-like symptoms appear, especially in the left lower extremities without an invasive procedure. The authors encountered an interesting case of a middle-aged female patient, who presented with sudden pain, swelling and skin color changes to the left lower extremity after right total knee arthroplasty and was diagnosed May-Thurner syndrome by computed tomography venography. This case is of clinical significance in that the early diagnosis of May-Thurner syndrome in the left lower extremity was made, which might have been overlooked after right total knee arthroplasty. This case is reported with a review of the literature review.

• Proceedings of the KSME Conference
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• 2001.06c
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• pp.482-484
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• 2001

In orthopedics, hip arthroplasty is the operation that replaces damaged hip joint to artificial joint. In hip arthroplasty, quite better result can be achieved if robot is applied to machine cavity in bone, especially when cementless stem is used. So several kinds of robots were introduced for hip arthroplasty, but they used MRI, CT Scan, vision analysis and real time tracking of bone position for registration of robot. To overcome shortage of conventional robot surgery, gauge based registration method was proposed and small robot was designed. In this method, small robot is mounted on femur, and its position is determined by gauge registration method. Operation procedure was performed on model femur and result was analyzed. This robotic hip surgery system is expected to more adaptable in operation room.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.7
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• pp.31-37
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• 2009

• Annual Conference of KIPS
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• 2022.11a
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• pp.600-602
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• 2022

2차원 이미지 또는 영상을 통한 자세 추정의 경우, 영상 내에서 발생할 수 있는 탐지 오류, 피사체 잘림, 폐색(Occlusion) 등으로 인해 자세 추정 정확도가 감소할 수 있다. 본 논문에서는 4장 이상의 다양한 각도로 촬영한 이미지를 NeRF(Neural Radiance Fields)를 통해 이미지 합성(Image synthesis)을 진행하여 3차원 모델을 생성한다. 이후 DeepLabCut을 사용하여 관절 좌표와 골격(Skeleton)을 구축한다. 구축한 골격을 인공지능에 학습시킨 뒤 2차원 영상에서의 관절 좌표 인식, 골격 구축, 자세 추정을 진행한다. 2차원 영상 테스트 데이터를 통해, 3차원 모델을 사전 학습한 인공지능 모델과 기존 2차원 이미지를 사용하여 학습한 인공지능 모델의 자세 추정 정확도를 비교한다.

• Journal of the Korean Orthopaedic Association
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• v.55 no.6
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• pp.527-533
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• 2020

Purpose: This study compared the effects of a buprenorphine transdermal patch (BTDP) on the chest and knee for pain control after total knee arthroplasty (TKA). Materials and Methods: A retrospective case-control study was conducted from August 2018 to August 2019 on 231 patients who underwent TKA. Two hundred cases were selected considering age, sex, and body mass index. Before and after applying the BTDP, the Numeric Rating Scale (NRS), adverse effects and compliance were measured. All measurements in the chest application group (group A=100) and knee application group (group B=100) were compared. Results: NRS was similar in rest between the groups treated with BTDP, but at two days and three days afternoon, five, six, and seven days postoperatively in group B, the NRS was significantly lower than that of group A. The adverse effects of the central nervous system and gastrointestinal system after applying BTDP were significantly lower in group B than in group A. No significant differences in adverse effects of the cardiovascular system and skin were observed between the two groups. Regarding the maintenance of BTDP, group B was significantly higher than group A. Conclusion: The direct application of BTDP after TKA to painful knee joints showed excellent results in early postoperative pain control and can be a useful method for increasing patient compliance by reducing the frequency of adverse effects.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2003.11a
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• pp.175-180
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• 2003

상완골 근위부 골절의 치료를 위해서 실시하는 상완골 두 치환술은 고난도의 수술이다. 그러나 수술 수기에 만전을 기하고 골절을 위해서 특별하게 고안된 치환물을 사용하면 통증을 해소되는 것은 물론이며 대부분의 견관절 기능도 회복이 가능하다고 생각한다. 또한 보다 좋은 결과를 얻기 위해서는 치환물과 수술 수기 등에 대해서 지속적인 개선이 매우 중요하다고 생각한다.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 1999.03a
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• pp.41-47
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• 1999

• Journal of Korean Orthopaedic Sports Medicine
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• v.6 no.1
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• pp.19-26
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• 2007

최근에 스포츠 손상이 증가하고 관절경을 이용한 치료가 발전하면서 조기에 더 적극적인 치료를 하는 추세이다. 또한 방사선 소견에 비하여 관절경하에서는 연골이 불안정하거나 분리되어 있는 경우도 있으므로 기존의 수술 적응증보다는 좀 더 광범위하게 관절경 검사 및 수술적 치료가 요구된다고 생각한다. 치료 방법을 하면 $1.5cm^2$ 이하의 병변을 가진 50세 이하의 환자는 관절경을 이용하여 변연 절제술, 연골하 천공, 연마, 미세 골절술, 소파술 등의 방법으로 치료할 수 있다. 같은 방법으로 50세 이상의 $3cm^2$ 이하의 병변을 가진 환자 중 mosaicplasty와 자가 연골 세포 이식술을 적용할 수 없는 환자에서 시도해볼 수 있다. $1.5\sim3cm^2$의 병변을 가진 50세 이하의 환자, 그전의 관절경적 치료로 실패한 경우에는 자가골 연골 이식 또는 자가 연골 세포 이식술을 이용하여 치료해야 한다. $3cm^2$ 이상의 병변을 가진 50세 이하의 환자는 자가 연골 세포 이식술이나 동종 골 연골 이식을 이용하여 치료하며, 50세 이상의 환자는 관절 고정술이나 족근 관절 인공치환술을 고려하는 것이 바람직하다.

• Journal of muscle and joint health
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• v.19 no.2
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• pp.161-172
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• 2012

Purpose: This study was to identify the factors influencing depression among patients with degenerative arthritis after total knee arthroplasty. Methods: The subjects were 108 patients who admitted or visited K hospital in K city after total knee arthroplasty. Data were analyzed using SPSS WIN 18.0 program. Results: The level of depression was 2.72 with a possible range of 1 to 5. Social support was 3.71 out of a total score 5. Self-efficacy was 64.47 ranged from 10 to 100. Self-esteem was 2.59 ranged from 1 to 5. The associated factors with depression were marital status, length of illness, perceived health status, pain, social support, self-efficacy, and self-esteem. Marital status, length of illness, and perceived health status accounted for 5.8% of depression. Next, all variables including pain, social support, self-efficacy and self-esteem accounted for 66.4% of depression. Conclusion: The level of depression among the subjects significantly be related to marital status, length of illness, perceived health status, pain, social support, self-efficacy and self-esteem. It indicates a need to develop nursing interventions for them to decrease depression and develop quality of life during recovery.