Cementless femoral stem AMIStem-H

The AMIStem has been developed to facilitate broaching and stem insertion when utilising the AMIS approach without compromising implant stability. BONE PRESERVING, AMIS FRIENDLY: First stem specifically designed for AMIS Reduced bone removal due to the optimised length Easier stem introduction due to the reduced lateral flare. Overall dimensions reduced by 33% compared to standard straight rectangular stems Technical Data NECK The mirror polished surface treatment minimises soft tissue damage and liner wear, making the AMIStem-H suitable for double mobility liners. Increasing size by size to restore anatomy. SHAPE The triple tapered design provides good axial and rotational stability with optimal fixation with bone. The rectangular cross-section facilitates effective stability but also promotes the preservation of bone vascularisation, since the diaphysis is not completely filled. SURFACE TREATMENT The horizontal and vertical macrostructures increase stability and enhance the contact surface area by 10-15%. Tip The double tapered distal tip reduces the risk of stress peak in the diaphysis. MATERIAL AMIStem-H and AMIStem-H Collared are made of Titanium- Niobium alloy in accordance with ISO 5832-11. Their surface presents a 80 μm thick Hydroxyapatite (HA) coating after a superficial sand-blasting of 4 to 7 μm roughness. The HA coating has chemical characteristics similar to that of the human bone which stimulates the bony ongrowth.