HA coating resulted in improved fixation of Schanz screws in bone and may be useful in prolonged external fixation of the lower leg. The fixation index proved to be a simple tool for the evaluation of the fixation strength of Schanz screws.

Background-Previous fluorescein angiographic studies have shown alterations in the macular microcirculation in patients with diabetes mellitus and arterial hypertension. In both diseases capillary blood velocity was reduced and capillary density decreased. These changes were more pronounced in diabetic patients. We have examined the influence of arterial hypertension in combination with diabetes mellitus. Methods-62 patients with diabetes mellitus and arterial hypertension (group 1) were matched with patients with diabetes mellitus but without arterial hypertension (group 2, match criteria: ETDRS stage of retinopathy). In all subjects fluorescein angiograms were performed with a scanning laser ophthalmoscope. Macular capillary blood velocity (CBV), perifoveal intercapillary area (PIA), the coeYcient of variation of both parameters, the area of the foveal avascular zone (FAZ), and the arteriovenous passage time (AVP) were assessed by digital image analysis. 2 (group 2)) were significantly diVerent between the two groups of diabetic patients. Conclusion-Arterial hypertension did not result in more severe macular capillary dropout than diabetes without hypertension. This might be explained by the fact that most of the patients were being treated with antihypertensive drugs. (Br J Ophthalmol 2000;84:1392-1396 Retinal changes associated with arterial hypertension and diabetes mellitus have been well documented. Considering the frequent coincidence of both diseases, it is important for both the prognosis and treatment to determine whether arterial hypertension aggravates diabetic retinopathy. A number of studies have shown an additive eVect which varies with the type of diabetes and the systolic or diastolic blood pressure (BP). Results-Systolic

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