Treatment of Periprosthetic Femoral Fractures Following Total Knee Arthroplasty

PURPOSE: The purpose of this study is to compare the treatment results of fracture fixations by using two minimal invasive techniques for patients with periprosthetic femoral fractures following total knee arthroplasty. MATERIALS AND METHODS: We reviewed 36 patients (5 males, 31 females) of periprosthetic femoral fractures whom were treated surgically between January 2005 and January 2011. Mean patient age was 68.9 years (range, 43 to 81 years) old and the follow-up period averaged 41 months (range, 18 to 72 months). Nineteen patients were treated with minimal invasive locking plate fixations (group I) and 17 patients with retrograde intramedullary nailing (group II). Clinical and radiological outcomes in each group were comparatively analyzed. RESULTS: Successful bone unions occurred in all patients and the mean time to bone union was 3.7 months in group I and 4.2 months in group II. There were no statistical differences between the two groups according to mean operative time and mean intraoperative blood loss. There were also no statistical differences between two groups according to clinical outcomes but the valgus deformity was apparent in group II and radiological outcomes revealed significant differences between the two groups. CONCLUSION: For the treatment of periprosthetic femoral fractures after total knee arthroplasty, two minimal invasive techniques have shown good clinical results. However, the minimal invasive plate fixation showed better results in the radiological alignments.

Prediction of HIV and AIDS Incidence Using a Back-calculation Model in Korea / 예방의학회지

OBJECTIVE: To estimate the status of HIV infection and AIDS incidence using a back-calculation model in Korea. METHODS: Back-calculation is a method for estimating the past infection rate using AIDS incidence data. The method has been useful for obtaining short-term projections of AIDS incidence and estimating previous HIV prevalence. If the density of the incubation periods is known, together with the AIDS incidence, we can estimate historical HIV infections and forecast AIDS incidence in any time period up to time t. In this paper, we estimated the number of HIV infections and AIDS incidence according to the distribution of various incubation periods RESULTS: The cumulative numbers of HIV infection from 1991 to 1996 were 708~1,426 in Weibull distribution and 918~1,980 in Gamma distribution. The projected AIDS incidence in 1997 was 16~25 in Weibull distribution and 13~26 in Gamma distribution. CONCLUSIONS: The estimated cumulative HIV infections from 1991 to 1996 were 1.4~4.0 times more than notified cumulative HIV infections. Additionally, the projected AIDS incidence in 1997 was less than the notified AIDS cases. The reason for this underestimation derives from the very low level of HIV prevalence in Korea. Further research is required for the distribution of the incubation period of HIV infection in Korea, particularly for the effects of combination treatments.

A Case of Bronchial Mucoepidermoid Carcinoma in Child

Bronchial mucoepidermoid carcinoma is very rarely encountered in children. We report a case of bronchial mucoepidermoid carcinoma in a 10-year-old boy who presented with persistent cough and atelectasis. Bronchoscopic examination showed a tumor mass occluding the right bronchus intermedius, and the mass was removed by bronchoscopy. The results of the pathological examination revealed low-grade mucoepidermoid carcinoma. He underwent right middle and lower lobectomy with bronchoplasty, and there was no metastasis. He remains symptom-free without recurrence of bronchial tumor during the follow-up period of 12 months.

A Clinical Study on BCG Lymphadenitis

PURPOSE: We studied the incidence and clinical course of BCG lymphadenitis to investigate the BCG related problem. SUBJECT AND METHODS: Three hundred and eighty-six infants received BCG vaccine (Pasteur-1173p2) in the Well Baby Clinic, Dept. of Pediatrics, Chonnam University Hospital from May 1993 and April 1994. Among them, twenty three infants developed regional lymphadenitis. We investigated the clinical course in twenty six infants with BCG lymphadenitis (three infants were transferred from the Public Health Center and they also had taken same BCG preparations). According to the lymph node size, we divided them into three groups (A : below 1cm, 5 infants; B : 1 to 2cm, 10; C : above 2cm, 11), and evaluated the clinical outcome. RESULTS: 1) The incidence of BCG lymphadenitis was 6.0% (23/386), the differences according to sex or age at vaccination were not observed. 2) Twenty three of twenty six infants (88.5%) showed one lymph node (left axillary 19 infants, left cervical 3 infants, left supraclaviclar 1 infant), but three (11.5%) showed multiple lymph node involvement. 3) Eight (30.8%) showed spontaneous improvement, but eighteen (69.2%) received single or double antituberculous medication at the beginning or after a period of observation. Two infants were treated by incision and drainage. CONCLUSIONS: The incidence of BCG lymphadenitis was relatively higher (6.0%) than previous reports, and the two thirds of the cases received antituberculous medication and or surgical treatment. Further prospective study according to the recent recommendation by the Korean Health Administration should be needed.