Medial Malleolar Stress Fracture in Athlete / 대한스포츠의학회지

The stress fracture is a disease which results from the repeated application of an abnormal stress to the normal bone, typically occurs in metatarsal bone, tibia, fibular and femur, but medial malleolus is rare. We report a case of stress fracture of medial malleolus in 22-year old wrestler.

Paraganglioma of the Bladder / 대한비뇨기과학회지

Paragangliomas are rare tumors of a neural crest origin, and belong to the amine- precursor-uptake decarboxylation (APUD) system. The great majority of paraganglioma are in the adrenal medulla. The majority of extraadrenal sites arise near the adrenal or along the nerve plexuses. Paragangliomas are only occasionally found in the wall of the bladder. Their preoperative diagnosis is suspected from a clinical history and an estimation of catecholamines, or their metabolic by-products, in a twenty-four-hour urine sample. The correct diagnosis is not made in the majority of cases because the tumors are frequently silent with regard to hormonal activity. Therefore, an excretory urogram, arteriography and cystoscopy, including biopsy, are important procedures for their preoperative diagnosis. We report a case of paraganglioma arising in the bladder wall, with brief review of literatures.

Adenomatoid Tumor of the Epididymis / 대한비뇨기과학회지

We report a rare case of an epididymal adenomatoid tumor in a 31-year-old man who had a slowly growing painless left scrotal mass for approximately two years. Physical examination revealed a rubbery, non-tender, 2x2cm sized mass located in the tail of the epididymis. Scrotal ultrasonography showed a 1.7x1.7cm sized isoechogenic mass inferior to the left testicle. Left epididymectomy done. The diagnosis was confirmed by a surgical excision and a subsequent histological analysis.

Retroperitoneal Malignant Schwannoma / 대한비뇨기과학회지

Schwannoma, also known as a neurilemmoma, neurinoma, and perineural fibroblastoma, can be either a benign or malignant tumor, arising from the associated nerve sheath. A retroperitoneal malignant schwannoma is a rare tumor. Immunohistochemical staining for S-100, leucine-7 and the myelin basic protein is useful for diagnosis. Here we report a case of retroperitoneal malignant schwannoma with a brief review of the literatures.

Ureteropelvic Junction Avulsion Due to Blunt Abdominal Trauma / 대한비뇨기과학회지

Ureteropelvic junction avulsion caused by blunt trauma is a rare condition which is often diagnosed after some delay. Herein, we report a case of traumatic ureteropelvic junction avulsion which has been treated successfully by end to end pyeloureterostomy.

Polyethylene Liner Wear in Harris-Galante Acetabular Cup: Two Dimensional versus Three Dimensional Method / 대한정형외과학회잡지

PURPOSE: The purpose of this study was to compare the two-dimensional with three-dimensional radiographic measurements of polyethylene liner wear in the Harris-Galante II acetabular cup. MATERIALS AND METHODS: We measured the polyethylene liner wear amount and the wear rate of 64 hips with Harris-Galante II acetabular cup by two methods: Livermore's method and modified Devane's method. We evaluated the relationships between the two methods. RESULTS: The average total amount of wear and the average wear rate are 0.86+/-1.01 mm and 0.18+/-0.20 mm/year using the two-dimensional method and 0.99+/-1.01 mm and 0.21+/-0.2 mm/year using three-dimensional method respectively. The amount of wear and the wear rate by the three-dimensional method was larger than those by the two dimensional method. CONCLUSION: The amount of polyethylene liner wear can be measured by the two-dimensional method because it is highly correlated with the amount that is measured by the three-dimensional method, since there was no differences between the two methods.

The biomechanical study of the bone-prosthesis interface stability according to the difference of types of porous-coated acetabular implant / 대한정형외과학회잡지

PURPOSE: To analyze the effects of implant design on the primary stability and the contact between bone and prosthesis of three different porous coated acetabular implants. MATERIALS AND METHODS: The distal part of sixty bovine femurs were employed. 52 mm acetabular cups were inserted tightly after 2mm under-reaming. Trilogy acetabular cups were inserted in Group I, Mallory head finned RingLoc cups in Group II, Duraloc spiked cups in Group III. The gaps between the acetabular cups and the bones were measured on the radiography. The axial compression test and rotation test were performed using Instron. RESULTS: The gaps between the acetabular cup and bone of Gorup I and II was significantly smaller than Group III at its central adjacent and peripheral area (p0.05) . The mean torque of 1 degree rotation test was higher in the Group III than in the group I and II without statistical significance (p>0.05) . The mean torque of 2, 3 and 5 degree rotation test was highest in Group II among three, but there were no statistical differences among three groups (p>0.05) . CONCLUSION: Triology and Mallory-Head cup can be assumed to have better primary stability than Duraloc cup. And additional fin or spikes attached on the acetabular implant couldn't enhance the primary bone-prosthesis interface stability.

Piriformis Syndrome: A Case Report / 대한정형외과학회잡지

The most common cause of pain in the distribution of sciatic nerve is a herniated lumbar disc, Spinal stenosis, intrapelvic masses, and diabetic neuropathy may also produce scitica-like symptom. Infrequently, Piriformis syndrome is a rare disease causing sciatica produced by entrapment of sciatic nerve by the piriformis muscle as it passes through the sciatic notch. Recently we experienced a case of piriformis syndrome to be successfully treated by exploration of sciatic nerve and sectioning of fibrous band between piriformis muscle and gluteus maximus muscle. We would describe the clinical feature of a piriformis syndrome, and review other literatures.