The aim of this study was to determine whether there are quantitative changes in the mechanoreceptors in the anterior cruciate ligament of unstable knee with injured medial articular cartilage or medial ligament. Twenty specimens of anterior cruciate ligament were obtained from medial articular cartilage injury group and medial ligament injury group, respectively. Forty anterior cruciate ligaments of the other side of knee were used as controls. The ligaments were transected and stained with a modified gold-chloride method. Mechanoreceptors were located almost exclusively in the periligamentous synovial tissue. The results were as follows; 1. Three kinds of mechanoreceptors were found at the surface of each ligament beneath the synovial membrane. 2. The type 2 mechanoreceptor was more common than any other types in all groups. 3. In the medial articular cartilage injury group, the number of mechanoreceptor was significantly decreased and morphologically degradated with synovial degeneration than the control group. The same findings were noted in the medial ligament injury group(P<0.003). 4. There was no statistical difference between the two experimental groups in numher of the mechanoreceptor. In conclusion, the mechanoreceptor of the anterior cruciate ligament of unstable knee with injured medial articular cartilage and ligament in the rabbit were decreased in its numher and were degradated morphologically than the control group. And it was suggested that reduced proprioception in unstable knee might he an another cause of development of osteoarthritis.
Anterior Cruciate Ligament* ; Cartilage, Articular* ; Knee ; Ligaments* ; Mechanoreceptors* ; Osteoarthritis ; Proprioception ; Synovial Membrane

Diastematomyelia, a form of spinal dysraphism, is characterized by a division of the spinal cord or canda equina resulting the form a bony or cartilaginous spur which transfixes the neural elements and dura. The presence of a structure of neural crest origin in the subarachnoid space connecting the spicules suggested that the anomaly resulted from delayed closure of the neural tube and its investments. The cinical finding are presumed due to its restriction, tethering of the normal apward migration of the spinal cord. Congenital anomalies of one or both lower extremities and spine are frequently found with this condition. The surgical removal is recommended as a prophylactic measure against further progressive neurological damage. The purpose of this paper is to presented becanse it was associated with clubfoot and adds to understanding of teratogenesis of diastematomyelia.
Clubfoot ; Investments ; Lower Extremity ; Neural Crest ; Neural Tube ; Neural Tube Defects ; Spinal Cord ; Spinal Dysraphism ; Spine ; Subarachnoid Space ; Teratogenesis

No abstract available.
Polymethyl Methacrylate*

No abstract available.
Adenocarcinoma* ; Colon* ; DNA* ; Flow Cytometry* ; Ploidies*

Chordoma is a rare distinctively malignant tumor thought to be histogenetically related to the primitive notochord, It is locally infiltrative but does not metastasize until late. The usual initial symptom is pain or some symptom caused by involvement of the nervous system. Involed in the order of frequency are the sacro-coccygeal area, the spheno-occipital area, and the other vertebral area. This case is a sacro-coccygeal chordoma that is confirmed by histologic examination. The lesion was treated by complete excision.
Chordoma ; Nervous System ; Notochord

No abstract available.
Reflex Sympathetic Dystrophy*

Limb salvage operation in primary malignant bone tumors is increasing recently, according to the improvement of diagnostic methods, surgical technique and adjuvant chemotherapy. The purpose of this study is to obtain the interim results of survival rate and the functional grade of the limb in primary malignant bone tumors treated by limb salvage operation. Between 1985 to 1993, 63 primary malignant bone tumors treated by limb salvage operations. Tumor prosthesis arthroplasty was performed in 49 patients, resection arthrodesis in 9 patients, and IM nailing with cement molding in 5 patients. Autoclave autograft was combined in 2 patients. Adjuvant chemotherapy and postoperative radiotherapy were performed in selected patients. The average follow-up period was 50 months(ranged 12 months to 116 months). In the cases of osteosarcoma, estimated survival rate was 61.9% based on Kaplan-Meier survival plot. In the parosteal sarcoma, the survival rate was 87.5% and 80% in chondrosarcoma patients. According to functional grading by Enneking, 66% was excellent, 20% was good, 11% was fair and one patients was poor. Complications occurred in 16 patients:wound infection was developed in 6 patients, local recurrence in 4, peroneal nerve palsy in 2 patients and femoral stem loosening in 2 patients. Fracture in resection arthrodesis and pulmonary metastasis were also occurred. Reoperation was performed in 10 patients at average 31 months after initial operation. Revision tumor persthesis arthroplasty was performed in one patient due to local recurrence and in 2 patients due to femoral stem loosening. Three amputations were done due to recurrence of tumor. IM nailing with cement molding was performed in one patient due to deep infection and repeated arthrodesis was done in a fracture patients. Scheduled custom-made tumor prosthesis arthroplasty was performed within a year in 2 patients treated with IM nailing with cement molding. In conclusion, with the careful preoperative assessment, adjuvant chemotherapy and skillful surgical technique, limb salvage operation would provide the primary malignant bone tumor patients for longer survival and better quality of life.
Amputation ; Arthrodesis ; Arthroplasty ; Autografts ; Chemotherapy, Adjuvant ; Chondrosarcoma ; Extremities ; Follow-Up Studies ; Fungi ; Humans ; Limb Salvage ; Neoplasm Metastasis ; Osteosarcoma ; Paralysis ; Peroneal Nerve ; Prostheses and Implants ; Quality of Life ; Radiotherapy ; Recurrence ; Reoperation ; Sarcoma ; Survival Rate

No abstract available.
Cartilage* ; Glutaral* ; Rabbits* ; Transplants*

BACKGROUND: Nevus depigmentosus was first reported in 1884 by Lesser. It is defined as a congenital non-progressive hypopigmented macule or patch that is stable in its relative size and distribution throughout the life of the individual. The etiopathogenesis and histopathological characteristics of nevus depigmentosus are not fully established. OBJECT: The purpose of this study is to investigate the clinical and histopathological characteristics and pathogenesis of nevus depigmentosus. METHODS: Clinieal survey was carried out on forty-nine patients with nevus depigmentosus and two skin biopsies were taken from eighteen patients; from the central part of the depigmented lesion and the border of the lesion including the perilesional normal skin. The sections were stained with hematoxylin-eosin, Fontana-Masson and S-100 protein. The ultrastructural evaluation were also done to detect alternation of melanocytes. RESULTS: The results are as follows ; 1. The lesions were mostly (91.8%) present before the age of three, but some lesions appeared in childhood (8.2%). 2. The lesions were most frequently found on the trunk (42.9%), followed by the face and scalp (20.4%). 3. There were 33 patients (67.3%) with the isolated type, 15 patients (30.6%) with the dermatomal type and one patient with the whorled type. 4. Histopathological studies have shown that the stainability of Fontana-Masson in the lesions of nevus depigmentosus was decreased compared with perilesional nomal skin, but there were no changes in the number of melanocytes. 5. There was a great reduction in the number of melanosomes in melanocytes and keratinocytes of nevus depigmentosus. In keratinocytes, there was some aggregations of melanosomes and some of them showed membrane bound architecture. CONCLUSION: The results of this study support the fact that nevus depigmentosus is caused by functional defects of melanocytes and morphological abnonnalities of melanosomes.
Biopsy ; Humans ; Keratinocytes ; Melanocytes ; Melanosomes ; Membranes ; Nevus* ; S100 Proteins ; Scalp ; Skin

BACKGROUND: The purpose of this study was to identify the clinical and radiological outcomes of hook plate fixation for lateral end fracture of the clavicle and acromioclavicular dislocation. METHODS: There were a total of 20 cases with lateral end fracture of the clavicle and 16 cases with acromioclavicular dislocation. All patients were evaluated for range of motion, functional score by using Constant score, and American Shoulder and Elbow Surgeons shoulder index at just before implant removal and at final follow-up. Coracoclavicular distance was measured in acromioclavicular dislocation and bony union was evaluated in the lateral end fracture of the clavicle. RESULTS: The clinical outcomes and range of motion were increased at the final follow-up compared with just before implant removal in both the lateral end fracture of the clavicle and acromioclavicular dislocation. In acromioclavicular dislocation, all cases—except one—showed maintenance of reduction after implant removal. Moreover, in the lateral end fracture of the clavicle, all cases—except one—showed bony union. CONCLUSIONS: Hook plate fixation in the lateral end fracture of the clavicle and acromioclavicular dislocation resulted in good clinical and radiological results.
Clavicle* ; Dislocations* ; Elbow ; Follow-Up Studies ; Humans ; Range of Motion, Articular ; Shoulder ; Surgeons