No abstract available.
Splenectomy*

This paper presents the result and statistical analysis of the experiment, in which selective anterior or posterior rhizotomy were carried out under microscopic surgery. The materials used for the experiment were 48 young rabbits, and they were divided into four groups. The group I, which was used as control, was subjected to lower dorsal bilateral laminectomies with dural incision, the group II to laminectomies with three right posterior rhizotomies, the group III to laminectomies with three right anterior rhizotomies, and the group IV to laminectomies with three right anterior and posterior rhizotomies. Scoliosis was induced in group Il, Ill and IV. There was no significant statistical difference in the degrees of curvatures among these three groups. The convexity of the curvature faced to the side of the divided roots. In group III and IV, scoliotic curvatures were obvious within two weeks, but there were no considerable changes thereafter. In group Il, the curves progressed slowly up to the 12th week. They were statistically significant at the 4th week and increased continuously thereafter. The histological findings in the group III and IV showed denervation atrophy of the paravertebral muscles at the apex of the curvature, but there was little or no muscle atrophy in the group I and II. We came to a conclusion from the experimental results that scoliosis may be induced not only by anterior root paralysis but also by selective posterior root paralysis.
Atrophy ; Denervation ; Laminectomy ; Muscles ; Muscular Atrophy ; Paralysis ; Rabbits ; Rhizotomy ; Scoliosis

No abstract available.
Kinetics* ; Wrist*

With the advent of improyed external fixation device, femoral lengthening has gained renewed popularity in recent years in the treatment of unequal leg length. Wagner(1971) and De Bastiani et al(1987), among others, have made epochal contribution in this field. During the period from May 1984 to May 1987, 25 patients with leg length discrepancy underwent femoral lengthening using Wagner's or De Bastianis distractable external fixators at the Department of Orthopedic Surgery, Seoul National University Hospital. There were 6 patients below 16 years of age admitted to the Children's Hospital, and 19 patients were 16 years or older. The mean age was 18.2 years, ranging from 3 years to 36 years. The underlying etiology included residual poliomyelitis in 20 patients, epiphyseal injury in 2 patients, congenital short femur in 1 patient, septic hip residua in 1 patient, and cerebral palsy in 1 patient. The mean leg length discrepancy was 4.5cm, ranging from 1.3cm to 7.4cm. The mean length gained was 4.1cm, ranging from 1.8cm to 6.4cm. All except two patients had two stage procedures with iliac crest strut bone graft. The mean time required for radiological consolidation of bone graft was 4.8 months. The plate and screws used for osteosynthesis was removed after the medullary canal has been re-established. Six patients had removal of the plate and screws between 8 months and 25 months after the second stage osteosynthesis. Technical errors included 1 case of incomplete osteotomy which required manual clasis, and another case of faulty insertion of Schanz screws that required reinsertion. Five cases (33.3%) had the minor pin tract infection. Schanz screw breakage occurred in a case of one stage femoral lengthening. Loosening of plate and screws was seen in three cases. One case had delayed union requiring augmentation bone graft. Stiff knee with less than 90°of flexion was encountered in one case. One case sustained fracture of patella during physiotherapy. Despite of a long list of complication, the ultimate goal of leg length equalization was successfully achieved in all the cases.
Cerebral Palsy ; External Fixators ; Femur ; Hip ; Humans ; Knee ; Leg ; Orthopedics ; Osteotomy ; Patella ; Poliomyelitis ; Seoul ; Transplants

No abstract available.
Adenocarcinoma* ; Estrogens*

No abstract available.
Brain* ; Neoplasm Metastasis*

The biomechanical responses, such as nucleus pulposus pressure, facet contact force, stress distribution among ligaments in the cervical spine under static loading like flexion and extension, were examined with 3-D nonlinear finite element model. Finite element model consisted of whole cervical spines with intact discs and ligaments was developed from 1mm thick CT-cross sections of a 25-year-old healthy young man. Geometrical nonlinearity was considered for the large deformation and ABAQUS package was used for calculation. Results were verified comparing with those of existing in vivo and in vitro experiments. Results indicated that, developed cervical spine FEM was well consistent with other experiments. Nucleus pulposus pressure increased in flexion and extension more in lower cervical region. Facet contact force increased more in lower cervical spine in extension. In addition, capsular ligament was the most important one among 7 cervical ligaments surrounding cervical spine both in flexion and extension. We could better understand the biomechanics of whole cervical spine with developed finite element model and it might be applied to dynamic or postoperative study.
Adult ; Humans ; Ligaments ; Spine*

No abstract available.
Neurofibromatoses* ; Scoliosis*

Supracondylar fracture of the humerus is the one of the commonest elbow fracture in children. There are much controversies surrounding the method of treatment for various and frequent complications such as cubitus varus and joint stiffness, etc. For the period of 2 years and 8 months from Jan. 1987 to Aug. 1989, 32 patients had undergone treatment at the Department of Orthopaedic Surgery, Choongang Gil Hospital. Ten cases among them were treated with close reduction and cast, 8 cases were treated with close reduction and pinning, and 14 cases were treated with open reduction and internal fixation. The results obtained are as follows; l. Of all fractures, extension type was 96.9%, and flexion type was 3.1%. According to the Holmberg classification, 5 cases belong to Group I (15.6%), 10 to Group II (31.3%), 7 to Group III (21.9%), and 10 to Group IV (31.3%). 2. Radial nerve injuries which now are thought to be neuropraxia were the most common form of concomitant injuries. 3. All fractures were found to obtain bone union with mean duration of bone union about 40.9 days. 4. There were 7 cases (21.9%) who had more than 10 degrees of elbow motion limitation. Three cases (9.4%) showed the change of carrying angle over 10 degrees in Group IV by Holmberg classification. 5. By the modified Mitchell and Adams' criteria for grading results, Excellent was 22 cases (68.7%), Good was 7 cases (21.9%), Fair was 2 cases (6.3%), and Poor was 1 case (3.1%). 6. In Holmberg classification, the higher severity, the longer mean duration of bone union and the higher joint stiffness made the prognosis worse.
Bone Cysts ; Child ; Classification ; Elbow ; Humans ; Humerus ; Joints ; Methods ; Prognosis ; Radial Nerve

Six hundred and fifty one cases of bone tumors diagnosed and operated at Department of Orthopedic Surgery, Seoul National University Hospital, from Jan., 1969 to Apr., 1989. were reviewed and analyzed with respect to the types of tumor, the age and sex distribution of the patients, the location of the lesions and the advances of diagnosis and treatment. 378 benign and 273 malignant bone tumors were identified. Osteochondroma(113 cases, 17.4%) was the most common bone tumor, followed by osteosarcoma(72 cases, 11.1%) and giant cell tumor(50 cases, 7.7%) Second decade was the most common age of bone tumors(216 cases, 33.2%) and male(379 cases, 58%) was more common than female. Femur(222 cases) was the most common site of bone tumors, followed by tibia and vertebra. For simple bone cyst, steroid injection was widely used recently. It was a simple and safe procedure and its results were similar to those of curettage and bone graft. Limb salvage operations were performed for malignant bone tumors increasingly. Neoadjuvant chemotyeraphy and limb salvsge operation using tumor prosthesis were performed in 5 patients of osteosarcoma and their results are so far promising. Of 7 cases of chondrosarcoma, the limb was salvaged by resection arthrodesis or resection arthroplasty. 7 cases of malignant fibrous histiocytoma were treated by radical ablative surgery and/or chemotherapy and radiation, but local recurrence or pulmonary metastasis were detected in all of them. So it was thought to be highly malignant bone tumors.
Arthrodesis ; Arthroplasty ; Bone Cysts ; Chondrosarcoma ; Curettage ; Diagnosis ; Drug Therapy ; Epidemiologic Studies ; Extremities ; Female ; Giant Cells ; Histiocytoma, Malignant Fibrous ; Humans ; Limb Salvage ; Neoplasm Metastasis ; Orthopedics ; Osteosarcoma ; Prostheses and Implants ; Recurrence ; Seoul ; Sex Distribution ; Spine ; Tibia ; Transplants