• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.1
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• pp.73-79
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• 2016

In this paper a cervical rehabilitation robot for Mckenzie exercises to be effective to neck pain relief is proposed. The robot has two degrees of freedom (DOF) for Lateral flexion and extension, Dorsal and Vental flexion which enable user to perform cervical stretching and isometric exercises for neck muscles. The mechanical parts of the cervical rehabilitation robot can be mounted on a back- or head-rest of chair, and user can perform the Mckenzie exercise with seated. In experiments we measured the range of motion of cervical part, EMG signals from neck muscles and the contact forces of a head bracket fixing the head part of user, and then evaluated their performances. From the experimental results, we showed a feasibility of the cervical rehabilitation robot proposed in this study.

• Journal of the Korean Arthroscopy Society
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• v.5 no.2
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• pp.63-68
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• 2001

Purpose : To propose the diagnosis, 'hypertrophy of the anterior cruciate ligament(ACL)', and its clinical, radiological and pathological characteristics. Materials & Method : Since Dec. 1995, we have experienced 10 patients(12 knees) with hypertrophy of the ACL. There were 2 males and 8 females, and the age of the patients ranged from 35 to 67 years. Characteristics of clinical, radiological and pathological findings were analysed. Results : The chief complaint was insidious onset of dull pain on the knee which became worse with activity. The constant physical finding was painful limitation of full extension of the knee. Sagittal MR images showed diffuse swelling of the ACL, similar finding that could be seen in acute ACL tear. Arthroscopically, noted was a marked enlargement of the ACL causing notch impingement. Biopsies of the hypertrophied ACL showed increased collagenous tissue with variable degree of myxoid degeneration. With partial excision of the hypertrophied ACL with or without notchplasty, the symptoms improved in all. Conclusion : Hypertrophy of the ACL, a newly proposed diagnosis, should be considered be determining the cause of the painful knee, and further study should be done about its pathogenesis.

• Journal of the Korean Arthroscopy Society
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• v.10 no.1
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• pp.103-107
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• 2006

Simultaneous acute rupture of the anterior cruciate ligament (ACL) and the patellar tendon is a very unusual injury. That is difficult to diagnose in initial evaluation of knee injury, because the patellar tendon rupture is often missed. We report a 26 year-old male patient who was treated with ACL reconstruction using achilles allograft and direct patellar tendon repair with achilles allograft augmentation. The patient had the stable knee and full range of motion. It's clinical results were excellent(Lysholm score 93, Tegner activity score 6).

• Physical Therapy Korea
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• v.8 no.4
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• pp.1-16
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• 2001

회전(turning)은 보행 중 방향을 바꾸는 운동 기술(motor skill)이고, 회전 전략(turning strategy)은 회전을 완수하는데 사용되는 일반적 행동 전형(generalized movement pattern)이다. 회전에 대한 보행속도의 영향은 분명하지 않다. 이 연구의 목적은 보행속도의 돌기 전략에 대한 영향을 분석하고 보행속도의 하지 내외 회전(internal and external rotation)에 대한 영향을 분석하는 것이다. 건강한 젊은 성인 15명이 이 연구에 자발적으로 참여하였다. 맥리플렉스 측정 장치(MacReflex measurement system)가 동작 분석(motion analysis)을 위해 사용되었다. 각각의 자원자들은 보행 중 90도 왼쪽으로 회전을 10회씩 완수하였다. 각각의 시도마다 보행속도를 다르게 하기 위해서 세 가지의 다른 요구들(slow, regular, fast)이 임의적으로 주어졌고 각각의 실제 보행속도가 자원자의 무게중심 변화에 따라 구해졌고 요구별 평균이 구해졌다. 회전 안쪽 발의 스핀(in side foot spin)은 보행속도가 증가함에 따라 증가했지만, 회전 바깥쪽 발의 스핀(out side foot spin)은 보행속도와 상관이 없었다. 하지의 내외 회전은 보행속도와는 상관이 없었지만, 같은쪽 발의 스핀과는 역관계가 있었다. 회전은 발 스핀이 있는 돌기와 발 스핀이 없는 돌기로 구분되는 것이 합당한 듯 하다. 제한된 시간과 공간 내에서 스핀은 보행속도가 빨라질수록 몸의 전방 운동량(forward momentum)에서 몸의 전방 운동량(forward momentum)으로의 전환이 스핀이 없는 회전 시보다 효율적이다. 고관절의 내외 회전 근육들은 회전전략에 상관없이 회전되는 동안 몸의 역학(body mechanics)을 조절하는데 중요한 역할을 맡고 있는 것으로 보인다. 앞으로 회전 시 몸의 생체 역학적 그리고 신경 근육적 기전들(biomechanical and neuromuscular mechanisms)을 밝히는 연구들이 필요하다.

• The Journal of Korean Academy of Prosthodontics
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• v.58 no.1
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• pp.35-41
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• 2020

Patients with collapsed occlusal support and unilateral chewing show parafunctional mandibular movements, which can be complicated in older patients. Gothic arch tracing and split cast technique are used to confirm the deviation between centric relation and anterior habitual bite in patient who has oral dyskinesia and collapsed occlusion. Temporary denture as occlusal stabilization appliance was provided for stable occlusion and reproducible mandibular movement. Definitive denture was fabricated by lingualized occlusion concept.

• Journal of the Korean Arthroscopy Society
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• v.4 no.1
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• pp.7-12
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• 2000

Purpose : The purpose of this study is to evaluate the clinical outcomes and radiological changes after reconstruction of anterior cruciate ligament with human allograft. Material and Method : Authors analyzed 22 cases of anterior cruciate ligament allograft reconstruction which were done from January, 1995 to December, 1998 and could be followed up for a year or more. All cases were followed and reviewed in terms of anterior drawer test, Lachman test, Pivot shift test, radiographic examination, knee range of motion, and side-to-side difference of anteroior tibial translation using CA-4000 knee motion analyzer, and Lysholm knee scoring system. Result : The mean Lysholm knee score was 54 preoperatively and improved to 81 postoperatively by average of 27. The side-to-side difference of anterior tibial translation using CA-4000 knee motion analyser was less than 3 mm in 16 cases$(73\%)$, between 3 and 5 mm in 4 cases$(18\%)$, and greater than 6 min in 2 cases$(9\%)$. Average tibial tunnel enlargement was 1.5 mm, but there were not any osteoiysis or cystic formation along the tunnel and no relationship between tunnel enlargement and clinical outcome. Conclusion : Although this study had limited cases, clinical results of anterior cruciate allograft reconstruction were similar to those of reconstruction with autograft reported in the literatures. We think that allograft is an acceptable substitute fer autograft in anterior cruciate ligament reconstruction.

• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.3
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• pp.453-458
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• 2004

Mandibular fracture is less common in children than in adults. However, children are more susceptible to ankylosis and developmental disorders, and don't respond as well to intermaxillary fixation compared to adults. On the other hand, bone fracture is healed more quickly in children and complications are scarce. Mandibular fracture in children is usually treated successfully with acrylic splint therapy with or without the use of eyelet wires and intermaxillary fixation. Severe complications that include ankylosis and developmental disorders may occur. The frequency and severity of such complications can be mitigated with a shorter duration of intermaxillary fixation and good post-operative care. Encouraging mandibular physical therapy by increasing patient motivation may be necessary in such cases where the patient's response is poor and the duration of intermaxillary fixation increases; when the patient is unable to undergo physical therapy, or when intermaxillary fixation is not necessary with the patient showing only minor symptoms such as trismus. In this case report, a 6 year-old girl with bilateral condylar fracture was treated with elastic in both the upper and lower jaws to allow mandibular physical therapy using a Benoist's appliance, which allows opening, lateral, and protrusive retrusive movements of the mandible. A 7-month follow-up showed beneficial therapeutic effects such as increased mandibular movement and prevention of condylar ankylosis.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.11
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• pp.761-767
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• 2019

In the present study, analyses of initial behavior of an air-launched projectile for varying initial conditions are performed by coupling computational fluid dynamics and 6 degrees of freedom calculations. Accuracy of the present numerical methods is validated by comparing the present result with the measured data. Launching safety analyses are carried out for various ejecting conditions by considering weight of the projectile and magnitude of front and rear ejector forces as the major parameters of initial behavior of the projectile. A response surface of the projectile launching safety is obtained in the range of the major parameters. In all the conditions of zero rear ejector force, unsafe launching behavior is observed. As the weight of the projectile decreases, the initial launching behavior becomes more unsafe.

• Journal of Oral Medicine and Pain
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• v.37 no.4
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• pp.221-225
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• 2012

Disc dislocation without reduction, as known as closed lock, is a clinical condition in which the disc is dislocated from the condyle and does not return to normal position during condylar movement When the condition of disc dislocation without reduction is acute, the initial therapy should include an attempt to reduce or recapture the disc by manual manipulation. When patients report a history of being locked for 1 week or less, manual manipulation is usually successful. In patients with a longer history, success rate tends to decrease rapidly. If the disc has been successfully recaptured, placing an anterior positioning appliance is recommended to prevent clenching on the posterior teeth, which would likely redislocated the disc. But it is hard to make an appliance immediately in the clinic because it takes too much time. And making an appliance using self-curing acrylic resin is not very popular because of its discomfort by odor and working time. Also, if the patient has resin allergy or is under orthodontic treatment, or if it is impossible to control behavior of the patient, it has been restricted to make an appliance immediately. Therefore, to supplement this disadvantages, we tried to confirm about successful short term use of temporary anterior positioning splint made by using putty impression material after manual manipulation in this study.

• The Journal of the Convergence on Culture Technology
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• v.10 no.5
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• pp.453-458
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• 2024

If you are unable to get comfortable sleep to maintain and recover your health, it will cause a lot of disruption to your daily life. Among the intraoral devices used to resolve snoring, obstructive sleep apnea, bruxism, teeth clenching, and mouth breathing, which interfere with a comfortable sleep, devices that stabilize the lower jaw by moving it forward are a treatment that replaces surgical therapy and positive airway pressure. It is showing effect. During use of the device, a force is generated that causes the lower jaw to return to its original position, so a device that fixes it with screws, rubber bands, etc. is used. To see the effect of the device, you must bite your upper and lower teeth. In order to eliminate the inconvenience of having to stay closed while sleeping, the device is manufactured only in the upper jaw and creates a vertical guideway in the lingual embarasure of the lower jaw in the shape of a key & key way structure, allowing twisting movements and allowing forward and lateral movements. It is about the development of a device that has a blocking function that allows the mouth to be opened while wearing the device and has a function that solves sleep apnea by inducing airway expansion during sleep.