• 대한치과교정학회지
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• 제13권2호
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• pp.155-163
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• 1983

Many different appliances have been used to move teeth or to attempt to inhibit or stimulate growth of the jaws. Especially, Orthopedic force was used to apply a constant force on the mandible. Various orthopedic forces bring the changes of surrounding tissue, growth and development on the mandibular joint. Author carried out this study to find the histological changes of the mandibular joint in rats when the mandible applied posterior displacement. For the purpose of this study, $009\times036inch$ closed coil spring and 030inch orthopedic wire were used between the post occipital region and the chin region in order to render the orthopedic forces, posteriorly. The experimental animals vu. used 1 month old (GroupI), 3 months old (Group II), and 12 months old (Group III) rats. Following results were obtained; 1. At the beginning of the experimental Group I, there were predominant increment of Cartilage layer in the posterior parts of condylar head. Especially, the mature chondrocyte zone was increased. 2. In the experimental Group II, the chondroblastic zone was decreased while it showed slightly increased mature cartilage zone. 3. In the experimental Group III, the mature chondrocyte zone was disappeared gradually and there was a tendency to reduce the endochondral bone formation in condylar head. 4. After 30 days of experimental Group I and in experimental Group II, there was a tendency to decrease the immature cellular zone in the glenoid fossa by pressure. 5. There were no histological changes in the articular disc by pressure.

• 대한정형도수물리치료학회지
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• 제27권3호
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• pp.1-15
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• 2021

Objective: The purpose of this study was to examine the differences in joint position sense (JPS), force sense (FS), and performance level of the upper extremities according to the injury and pain experiences of Korean elite archers. Methods: A total of 15 subjects were briefed about the purpose of this study and agreed to participate voluntarily. JPS was evaluated using the laser-point attached to the wrist while aiming at the target. The difference when relocating while aiming was used as JPS factor. FS was evaluated using load cell through reproduces same muscle strength. Fear-Avoidance Beliefs Questionnaire (FABQ) was used to evaluate psychosocial factors, Kerlan-Jobe Orthopedic Clinic overhead athlete scores (KJOC) and numerical rating scale (NRS) was used to evaluate pain. and performance was evaluated by tournament match score. Results: There is a strong correlation between the current pain and KJOC. Moreover, moderate correlation between KJOC and FABQ also current pain and both upper trapezius and lower trapezius in elite archers. The mean (SD) between groups based on current pain display relatively large margin in force sense than without pain group. The result presents that there is a significant difference in performance and pain. There is a significant difference in the force sense of the upper and lower trapezius and pain. Conclusions: Result present there is a significant difference in functional level in the average comparison between groups according to the presence of absence of current pain. There is a significant difference in the force sense of the upper trapezius as well as lower trapezius and without pain group present a relatively low joint position sense error compared to the groups.

• 한국정밀공학회지
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• 제26권2호
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• pp.126-132
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• 2009

This study examined the differences in spatio-temporal parameters, joint angle, ground reaction force (GRF), and joint power according to the changes of gait speed for trans-tibial amputees to investigate the features of the energy-storing foot for sports. The subjects walked at normal speed and at fast speed, wearing a single-axis type foot (Korec) and an energy-storing foot for sports (Renegade) respectively. The results showed that Renegade yielded faster gait speed as well as more symmetric gait pattern, compared to Korec. However, as gait speed was increased, there was no significant difference in kinematics, ground reaction force, and joint power between two artificial foots. This was similar to the results from previous studies regarding the energy-storing foot, where the walking velocity and gait symmetry have been improved. Nevertheless, the result of this study differed from the previous ones which reported that joint angle, joint power, and GRF increased as the gait speed increased except spatio-temporal parameters.

• 대한족부족관절학회지
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• 제28권1호
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• pp.21-26
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• 2024

Purpose: Foot pressure measurement devices are used widely in clinical settings for plantar pressure assessments. Despite the availability of various devices, studies evaluating the inter-device reliability are limited. This study compared plantar pressure measurements obtained from HR Mat (Tekscan Inc.) and EMED-n50 (Novel GmbH). Materials and Methods: The study involved 38 healthy male volunteers. The participants were categorized into two groups based on the Meary's angle in standing foot lateral radiographs: those with normal feet (angles ranging from -4° to 4°) and those with mild flatfeet (angles from -8° to -15°). The static and dynamic plantar pressures of the participants were measured using HR Mat and EMED-n50. The reliability of the contact area and mean force was assessed using the interclass correlation coefficient (ICC). Furthermore, the differences in measurements between the two devices were examined, considering the presence of mild flatfoot. Results: The ICC values for the contact area and mean force ranged from 0.703 to 0.947, indicating good-to-excellent reliability across all areas. EMED-n50 tended to record higher contact areas than HR Mat. The mean force was significantly higher in the forefoot region when measured with EMED-n50, whereas, in the hindfoot region, this difference was observed only during static measurements with HR Mat. Participants with mild flatfeet exhibited significantly higher contact areas in the midfoot region for both devices, with no consistent differences in the other parameters. Conclusion: The contact area and mean force measurements of the HR Mat and EMED-n50 showed high reliability. On the other hand, EMED-n50 tended to record higher contact areas than HR Mat. In cases of mild flatfoot, an increase in contact area within the midfoot region was observed, but no consistent impact on the differences between the two devices was evident.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제30권4호
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• pp.345-352
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• 2008

Purpose: This study was performed to evaluate the stress distribution in the bone and the displacement distribution of the miniscrew under orthopedic force with two different types of miniplate design as skeletal anchorage for orthopedic treatment. Materials and methods: Finite element models were made for 6-hole miniplate (0.8mm in thickness), which were designed in two different shapes-one is curvilinear shaped (C plate, Jeil Medical Co., Korea) and another, Y shaped (Y plate), fixed with 3 pieces of miniscrew 2mm-diameter and 6mm-long respectively. A traction force of 4 N was applied in $0^{\circ}$, $30^{\circ}$ and $60^{\circ}$ to imaginary axis connecting two unfixed distalmost holes of the miniplate. Results: The maximum von Mises stress in the bone was much greater in the cortical portion rather than in the cancellous portion. C plate showed greater maximum von Mises stress in the cortical bone than Y plate. The maximum displacement of the miniscrew was greater in C plate than Y plate. The more increased the angle of the applied orthopedic force, the greater maximum von Mises stress in the bone and maximum displacement of the miniscrew. It was observed that in C plate, the von Mises stress in the bone and displacement of the miniscrew were distributed around the distalmost screw-fixed area. Conclusions: The results suggest that Y plate should have the advantage over C plate and in the placement of the miniplate, its imaginary axis should be placed as parallel as possible to the direction of orthopedic force to obtain its primary stability.

• 대한치과교정학회지
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• 제28권3호
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• pp.453-459
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• 1998

저자들은 임프란트 매식 후 골유착을 위한 초기 치유기간 이전에 악정형력이 임프란트 주위 조직에 미치는 영향을 관찰하기 위하여 가토 12마리의 양측 대퇴골에 임프란트를 식립하고 2주, 4주 그리고 6주후에 각각 300g의 악정형력을 Ni-Ti close coil spring을 이용하여 매식된 임프란트에 4주동안 가하고 관찰한 후 다음과 같은 결론을 얻었다. 1. 모든 실험군의 임프란트는 4주간의 악정형력 적용후에도 안정된 견고성을 유지하였다. 2. 2주 실험군에서 대조군에 비해 임프란트와 골조직 사이의 섬유조직 증식이 많이 관찰 되었으나 특이할만한 염증소견은 관찰되지 않았다. 3. 4주 실험군, 대조군에서는 2주 실험군, 대조군과 각각 비교하였을 때 보다 많은 양의 골재생이 관찰 되었으며 실험군과 대조군 모두에서 임프란트와 골조직 사이의 섬유조직은 관찰하기 힘들었다. 4. 6주에서는 실험군과 대조군 사이에 뚜렷한 차이가 발견되지 않았다. 이상의 결과로 보아 임프란트 주위의 골조직 재생이 충분하지 않아도 골의 양과 질이 우수해 임프란트 식립시 견고한 초기고정을 얻을 수 있다면 골유착이 완성되는 초기 치유기간 이전에도 치과교정적 고정원으로 사용가능할 것으로 사료된다.

• 대한관절경학회지
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• 제15권1호
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• pp.58-68
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• 2011

견봉쇄골관절 손상은 내전 상태에서 견관절 외측에 직접 타격으로 발생하며 주로 활동력 있는 비교적 젊은 세대에서 흔하다. 손상력에 따라 주로 견봉쇄골인대 단독 손상 또는 오구쇄골인대와 함께 파열된다. 대부분의 경우 수술적 치료 없이 보존적 요법으로 해결되지만 수술적인 가료가 필요할 경우 표준으로 삼을 수술법을 선택하기 어렵다. 이에 의거해서 이 장에서는 견봉쇄골관절은 해부학적 특성을 살펴보고 특성에 따른 치료법을 소개하기로 하겠다.

• 대한정형외과스포츠의학회지
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• 제10권2호
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• pp.117-120
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• 2011

심수지 굴건의 견열성 파열은 상대적으로 드문 손상으로 심수지 굴건의 파열은 주로 심수지 굴건이 수축된 상태에서 순간적으로 일어나는 원위지절의 신전에 의해 일어나거나 중립위의 수지 말단에 강한 신전력이 작용하여 과신전되어 발생한다. 본 증례는 22세 남자 전투 경찰대원으로 방패를 쥔 상태에서 진압훈련 후 2일째 심수지 굴건의 파열이 발생한 드문 경우로 문헌 고찰과 함께 보고하고자 한다.

• 대한족부족관절학회지
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• 제8권2호
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• pp.221-223
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• 2004

Bosworth fracture-dislocation of ankle is very rare, occurred by eversion and external rotation force. It is known as irreducible fracture by closed method. Also, compartment syndrome after ankle fracture are exceedingly rare. There are only a few reported cases of compartment syndrome after ankle fracture and compartment syndrome are involved commonly deep posterior compartment. We present a case in which a patient had a Bosworth fracturedislocation of the ankle underwent open reduction with internal fixation and subsequently occurred an anterior compartment syndrome of the leg.

• 대한치과교정학회지
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• 제44권3호
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• pp.143-153
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• 2014

An 8-years old boy with facial asymmetry and unilateral posterior crossbite on the left side received orthopedic and orthodontic treatment. During the first phase of treatment, the narrow maxillary arch was expanded using an acrylic plate. Then, the acrylic plate was used as a bite block with occlusal indentations from the construction bite that was obtained with the incisors in a coincident dental midline. After the position of the mandible was stabilized, the second phase of orthodontic treatment was initiated using fixed appliances for detailing of the occlusion. Skeletal symmetry, ideal occlusion, and coincident dental midlines were thus achieved. Functionally, occlusal force balance and masticatory muscle activity were improved, and the chewing patterns were normalized.