A novel swelling mica of composition, Na 2.94 (Mg 5.55 Ti 0.07 Fe 0.04 ) (Al 2.07 Si 5.83 )O 20 F 4 ·1.72H 2 O, was synthesized from kaolinite, and this mica was found to be very selective for Sr with a high capacity for uptake. Apparently, both tetrahedral and octahedral sheets contribute to the total negative charge in this mica. A relatively low-temperature heat treatment at 2508C of the Sr-exchanged mica resulted in the collapse of the hydrated interlayer spacings of the mica to immobilize strontium in a stable unhydrated phase.
We employed hydroxyapatite (HA) granules to enhance screw fixation in revision surgery of failed osteosynthesis with a compression hip screw system in an 83-year-old woman. After reduction of the fracture, the fracture site with a large bone defect was filled with HA granules, and osteosynthesis was accomplished with a double cannulated lag screw and plate system. We feel that this HA granule augmentation method may also be suitable for osteosynthesis in other osteoporotic fractures.
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