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JYMS : Journal of Yeungnam Medical Science

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Joo Chul Ihn 13 Articles
Treatment of bone tumors with a custom-made prosthetic replacement.
Hyun Kug Shin, Jae Sung Suh, Jong Chul Ahn, Joo Chul Ihn
Yeungnam Univ J Med. 1991;8(1):206-214.   Published online June 30, 1991
DOI: https://doi.org/10.12701/yujm.1991.8.1.206
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AbstractAbstract PDF
We treated three cases of bone tumors-giant cell tumor, chondroblastoma and malignant fibrous histiocytoma-with a custom-made prosthetic replacement. The patients were followed from 10 months to 18 months, postoperatively. The results of these study are as follows: 1. Satisfactory anatomic restoration 2. Early ambulation 3. Good function 4. Biomechanically sound reconstruction
Three Cases of Unusual patterns of Pyogenic Spondylitis.
Myun Whan Ahn, Dae Jin Suh, Jong Chul Ahn, Joo Chul Ihn
Yeungnam Univ J Med. 1990;7(2):189-195.   Published online December 31, 1990
DOI: https://doi.org/10.12701/yujm.1990.7.2.189
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AbstractAbstract PDF
Pyogenic vertebral osteomyelitis is rare. It most commonly occurs at the lumbar area and in the fifth to seventh decades of life. Most individuals present with back pain, abdominal pain, hip pain and meningeal syndrome. We experienced three cases of unusual patterns of pyogenic osteomyelitis. The first case developed after sepsis. The second case developed after open fracture and infection of other site. The third case was misdiagnosed as metastatic cancer. We present these cases with a brief review of literatures.
Photoelastic analysis of the Stress distribution on an intervertebral disc.
Hyun Kug Shin, Jae Chang Lee, Myun Whan Ahn, Jong Chul Ahn, Joo Chul Ihn
Yeungnam Univ J Med. 1989;6(2):223-239.   Published online December 31, 1989
DOI: https://doi.org/10.12701/yujm.1989.6.2.223
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AbstractAbstract PDF
To observe the change in the status of stresses according to three different postural angulation of an intervertebral disc with or without nucleus pulposus, 6 specimens of a 3-dimensional photoelastic model of the spine were made of epoxy. The nucleus pulposus portion was replaced with silicon in three models, and the three were made without silicon. Through axial application of a vertical compressive load of 8 kg, the peculiar patterns of the isochromatic fringes were observed. Stresses on the intervertebral disc were analyzed according to three different postural angulations of the intervertebral disc with the nucleus pulposus and without the nucleus pulposus. The results of these study are as follow: 1. In an erect neutral posture with the nucleus pulposus, the stress concentration was much increased at the posterior portion rather than at the anterior portion. Also, the high stress was concentrated at the medial and central portion. In an erect neutral posture without the nucleus pulposus, the stress concentration was much increased at the anterior portion rather than at the posterior portion and the stress distribution seemed to be locally concentrated. 2. In a maximal flexed posture, the stress concentration was much increased at the posterior portion rather than at the anterior portion. Comparing the presence of the nucleus pulposus with the absence of the nucleus pulposus, the stress concentration was lower at the anterior portion in the presence of the nucleus pulposus than in the absence of the nucleus pulposus. However, the stress distribution at the posterior portion was nearly same in the two groups. According to the analysis of the stress distribution diagram, as a whole, the stress pattern around the disc was evenly distributed. 3. In a maximal extended posture, the higher concentration of the stress distribution at the anterior and medial portion rather than in the posterior and lateral portion was observed. The stress concentration was higher in the presence of the nucleus pulposus than in the absence of the nucleus pulposus. 4. Comparing the maximal flexed posture with the erect neutral posture, the stress concentration in the flexed posture was much decreased in the posterior portion rather than in the erect neutral posture, and an even distribution of the stress pattern in the flexed posture was observed. 5. In the presence of the nucleus pulposus, at the anterior and posterior portion, the stress concentration in the flexed posture was much decreased compared with the extended posture. In the absence of the nucleus pulposus, at the anterior and posterior portion, the stress concentration in the extended posture was much decreased compared with the flexed posture.
A Case of Separation of the Symphysis Pubis in Association with Delivery.
Sae Dong Kim, Joo Chul Ihn, Jae Chang Lee
Yeungnam Univ J Med. 1988;5(2):201-203.   Published online December 31, 1988
DOI: https://doi.org/10.12701/yujm.1988.5.2.201
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Separation of the symphysis pubis in association with delivery is very rare. The Korean orthopedic and obstetrical literature pertaining to this syndrome is absent. The physiological widening is small and asymptomatic, but a separation of more than one centimeter may occur and in usually symptomatic. A twenty-six-year-old woman of separation of symphysis pubis associated with delivery was treated successfully with the treatment of reduction and pelvic band, with absolute bed rest in the lateral decubitus position.
The Treatment of Tibial Shaft Fractures by Interlocking Nailing.
Jae Chang Lee, Jae Sung Lee, Myun Hwan Ahn, Sae Dong Kim, Joo Chul Ihn
Yeungnam Univ J Med. 1988;5(1):61-67.   Published online June 30, 1988
DOI: https://doi.org/10.12701/yujm.1988.5.1.61
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The treatment of tibial shaft fracture has become one of the most controversial subjects in orthopedic surgery. Comminuted, segmental and rotationally unstable fractures or bone defect at fraction site have problems of the fixation. The interlocking nail solve these problems. We have experienced 8 cases of the tibial shaft fractures treated with interlocking nail from 1986 to 1988. Authors analyzed these cases and out own clinical study. The results were as follows. 1. The average bone union rate was about 15 weeks. 2. The interval between operation and crutch walking was 4.3 weeks. 3. The merits of this operation were the short hospitalization and early adaptation of social activity. 4. The advantage is be able to do early ambulation without following muscular atrophy or joint stiffness. 5. The results were assessed on clinical examination and radiographic appearance by Hamza et al. An excellent results were 7 cases and good result was 1 case.
Diagnostic Value of Computed Tomography in Acetabular Fracture.
Sun Yong Kim, Bok Hwan Park, Joo Chul Ihn
Yeungnam Univ J Med. 1988;5(1):43-48.   Published online June 30, 1988
DOI: https://doi.org/10.12701/yujm.1988.5.1.43
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We retrospectively analyzed 22 patients pelvic CT, in whom the acetabular fracture were suspected in plain film. And compared and analyzed the computed tomogram findings and plain radiographic findings. The results were as follows. CT enables better evaluation of shape, extent, and degree of separation of fragment. CT was helpful in detecting the combined fracture and soft tissue injuries. CT showed intraarticular loose bodies, which were invisible on plain film. In patients with pelvic trauma, no necessary changing position during CT examination. CT was useful demonstrates the remnant of intraarticular osseous fragment and adequacy of reduction after surgery.
A Clinical Study on the Fractures of the Femoral Neck in Children.
Sae Dong Kim, Joo Chul Ihn
Yeungnam Univ J Med. 1988;5(1):17-22.   Published online June 30, 1988
DOI: https://doi.org/10.12701/yujm.1988.5.1.17
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AbstractAbstract PDF
Fractures of the femoral neck in children are rare and usually the result of severe trauma. The femoral necks in children, in contrast to those of adults, have many anatomic and physiologic differences. Among the late complications encountered are avascular necrosis, coxa vara, premature closure of the proximal capital femoral epiphysis and nonunion. In spite of careful management, significant complication rate often results. Nine cases of fractures of the femoral neck in children which were treated at Yeungnam University Hospital from June 1984 to August 1987 were reviewed. The results obtained are as follows: 1. The main causes of fractures were traffic accidents (5 cases). 2. Among 9 patients, 6 were girls and 3 were boys. 3. According to the classification of Delbet and Colonna, the transcervical fracture (6 cases) was the commonest type. 4. 4 cases were treated by closed reduction and internal fixation, 3 cases were treated by open reduction and internal fixation. 2 cases were treated by skin traction and cast. 5. The results were analyzed according to Ratliff's assessment. 6 cases showed good results, and 3 cases showed poor results. 6. Early diagnosis and good fixation method seemed to be vital to prognosis.
Osteogenesis Imperfecta (Correction of Anterior Tibial Bowing): A case report.
Jae Sung Seo, Joo Chul Ihn
Yeungnam Univ J Med. 1987;4(1):157-163.   Published online August 31, 1987
DOI: https://doi.org/10.12701/yujm.1987.4.1.157
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AbstractAbstract PDF
Osteogenesis imperfecta has been categorized as a heritable disorder of connective tissue affecting both bone and soft tissues and is characterized by fragility of bone, blue sclera, and deafness, less frequently by dentinogenesis imperfect and laxity of ligament. The goals of orthopedic management with osteogenesis imperfecta are the treatment of acute factures and long term rehabilitation in an effort to maintain ambulation. We report a case of osteogenesis imperfecta with anterior bowing of tibia which was successfully corrected by multiple osteotomies and intramedullary fixation by Sofield method and reviewed literatures.
Treatment of Carpal Scaphoid Fracture.
Won Jin Beck, Jae Sung Seo, Jong Chul Ahn, Joo Chul Ihn
Yeungnam Univ J Med. 1986;3(1):361-366.   Published online December 31, 1986
DOI: https://doi.org/10.12701/yujm.1986.3.1.361
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AbstractAbstract PDF
Fracture of the carpal scaphoid bone is the most common fracture of the carpus. Unfortunately, nonunion are common since the symptoms do not alert patents to seek early medical treatment and the diagnosis is easily missed. Fracture of the scaphoid is a common condition whose management remains controversial. The conservative treatment has many complications, these include inability to word while in plaster, stiffness of the wrist afterwards, muscle wasting, weakness and malunion. So various operative treatments of scaphoid fracture have been developed. Open reduction by use of screws suggested by Maclaughlin first in 1954. In 1984 a new and simple operative technique has been developed to provide rigid internal fixation for all types of fractures of the scaphoid by T.J. Herbert. This involves the use of a double-treaded bone screw which provides good fixation that, after operation, a plaster cast in rarely required and most patients are able to return to work within a few weeks. Authors have experienced 10 cases of scaphoid fracture and accomplished good result in all cases by internal fixation using Herbert screw. The results are as follows Of these 10 fractures, 2 were fresh fractures and 8 were nonunions of scaphoid fracture. In nonunion cases, the time interval between fracture and operation was from 5 months to 5 years. The postoperative immobilization period was average of 4 weeks. Short period of immobilization achieved early functional recovery of the wrist. The bony unions in roentgenogram were seen from 3 months to 9 months after operation. In 2 cases the fracture gap was seen after 9 months. But in these cases the symptoms such as pain and range of motion of wrist were improved.
The Effect of Tension Band Wiring in the Treatment of the Olecranon Fracture.
Joo Chul Ihn, Jong Chul Ahn, Sae Dong Kim, Myun Whan Ahn, Jae Sung Seo
Yeungnam Univ J Med. 1985;2(1):59-63.   Published online December 31, 1985
DOI: https://doi.org/10.12701/yujm.1985.2.1.59
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AbstractAbstract PDF
Treatment of the olecranon fractures by prolonged immobilization often results in limited elbow motion. With the use of tension band wiring, anatomical reduction was obtainable, and only a short period of immobilization was needed. We reviewed the cases of 17 patients who underwent surgical treatment of the olecranon fracture. All patients were treated by tension band wiring. In the overall series, we were able to obtain 53 percent excellent, 30 percent good, and 18 percent fair results.
A Clinical Analysis Femur Neck Fracture in Elderly Patients.
Joo Chul Ihn, Myun Hwan Ahn, Jae Sung Seo
Yeungnam Univ J Med. 1985;2(1):11-22.   Published online December 31, 1985
DOI: https://doi.org/10.12701/yujm.1985.2.1.11
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Femur neck fracture is well known as one of the major death cause after trauma in elderly patients, and unsolved fracture due to its frequent association with complications such as avascular necrosis and nonunion. Through meticulous evaluation of the patient, hip and surgeon's experiences, reduction of mortality and morbidity as well as rapid recovery of the patient to the preinjury social and ambulatory status without local complications and revision after treatment is urgently needed. Many factors about this fracture in itself were noted, but we have analyzed 18 femur neck fracture of the patients older than 50 years preliminarily according to age, fracture pattern, osteoporosis, etiology and method of treatment with its delay in association with major complications especially avascular necrosis and nonunion. The results are as follows; 1. Of these 18 fractures, 11 were in females, 8 were caused by minor trauma such as slipdown accident and 4 were associated with definite osteoporosis according to the Sing's classification. 2. Fracture pattern of these 18 are undisplaced in 4, displaced subcapital in 11, displaced transcervical in 3. 11 fractures in the patients older than 60 year are composed of 3 undisplaced or impacted fractures and 8 displaced subcapital fractures. 3. These 18 fractures were treated by closed reduction and internal fixation with multiple pins in 13, and hemiarthroplasty in 4, but one was not treated to die after discharge from hospital. 4. Undisplaced or impacted fractures and 3 displaced transcervical fractures were not associated with any complications such as avascular necrosis or nonunion. But 4 of 6 displaced subcapital fractures were complicated by avascular necrosis, 3 of which were reduced in the varus position within 1 week, and the other was reduced in the good position on 1 week after trauma. There was no complication in 2 displaced subcapital fractures reduced in valgus position within 3 days after trauma. According to the above results, the prognosis of the femur neck fracture is dependent upon the fracture pattern and delay in its treatment. So it is inevitable to reduce the fracture in anatomical or valgus position as early as possible. But the arthroplasty may be needed in displaced subcapital fractures delayed for several days, with its reluction in extreme varus position or impossible and with preexisting disease in the same hip joint (total hip replacement).
A Case of the Solitary Neurofibroma at the Median Nerve.
Joo Chul Ihn, Jong Chul Ahn, Sae Dong Kim, Myun Whan Ahn
Yeungnam Univ J Med. 1984;1(1):199-206.   Published online December 31, 1984
DOI: https://doi.org/10.12701/yujm.1984.1.1.199
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With respect to the histogenesis of the neurofibroma, there are many controversies, since von Recklinghausen postulated that neurofibromas are mainly fibrous tumors arising from the connective tissue of the nerve sheaths. According to the recent studies through the electron microscope, the neoplastic perineurial cells are regarded as the main components of the tumor. So, the neurofibroma enucleated from the median nerve at the level of proximal arm without resulting neurologic sequale was examine through the light-and electron microscope. Ultrastructurally, this tumor is composed of the perineurial cells, fibroblasts, and collagen fibers. The predominant perineurial cells show distinct basal lamina, and contain abundant microfilaments.
Arthroscopy of the Knee Joint.
Joo Chul Ihn
Yeungnam Univ J Med. 1984;1(1):5-12.   Published online December 31, 1984
DOI: https://doi.org/10.12701/yujm.1984.1.1.5
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AbstractAbstract PDF
No abstract available.

JYMS : Journal of Yeungnam Medical Science