תוצאת חיפוש

Aseptic Loosening of Joint Implants

Dror Fuchs, Chaim Zinman, Dina Lewinson

Orthopedic and Traumatology Dept. B, Rambam Medical Center; and Div. of Morphology Sciences, Bruce Rappaport Faculty of Medicine, The Technion, Haifa

The purpose of orthopedic joint implants is to improve joint movement. Within the past 30 years, biomechanical improvements affecting the life-span of the implants has brought a new type of problem: the biological response to debris from the implant material contributes greatly to aseptic loosening of the prosthesis. The process is mediated by osteotropic factors, cytokines released from mononuclear cells, and osteoblasts and osteoclasts in the bone-cement interface or bone-implant interface.

Biofeedback Treatment of Raynaud's Disease

M. Birger, R. Sha'anani, F. Pavlotzki

Psychiatric Day Care and Dermatology Depts., Chaim Sheba Medical Center, Tel Hashomer and Psychiatric Service of Leumit Health Insurance Company

Raynaud's disease is characterized by intermittent peripheral vasoconstriction leading to pallor, cyanosis and reactive vasodilation of the arterioles of fingers and toes. These phenomena are accompanied by sensations of cold or warmth, pain and difficulty in manipulating the palms. Ulcerations of the fingertips can occur in severe cases. Since conservative medical treatment, consisting of preventive measures and changing various habits, results in alleviation in only half the patients, sympathectomy is often required. Psychological intervention, including biofeedback, also has a significant role. Biofeedback involving relaxation techniques, guided imagination, and in parallel, computer-assisted monitoring of sympathetic arousal, might lead to symptom reduction as a unique treatment or in conjunction with other treatment modalities.

Biological Test for Menopausal Osteoporosis

Benjamin Klein, Nathan Rojansky

Depts. of Experimental Surgery and of Obstetrics and Gynecology, Hadassah- Hebrew University Medical Center, Ein Kerem, Jerusalem

Osteoporosis has become a major public health problem in many western countries in which about 25% of women by the age of 65 will have had osteopenic fractures. The most important contributing factor to this condition is loss of gonadal function. This progressive disease, characterized by reduction in bone mass, may be prevented by estrogen replacement therapy. While there are several methods of diagnosing the disease when already established, there is no method that can identify women at high risk of developing osteoporosis. We have developed a biological test in which the serum of postmenopausal women is added to rat osteoprogenitor cell culture and its influence on proliferation, differentiation and mineralization of bone cells is determined. The serum of 20 menopausal women was examined by the biological test and the results compared to the findings of dual photon absorptiometry. This showed that rapid bone-losers had a significantly lower mineralization index as compared to nonosteopenic women (p<0.0001). The proliferation index (cell count) and alkaline phosphatase activity did not show significant differences between osteopenic and nonosteopenic groups. This preliminary study showed that a test based on serum reacting with a culture of bone cells to induce mineralization may be of value in the diagnosis of osteoporosis.