Product Description Proximal support of the implant is desired in all femoral revision hip surgeries. However, when the surgeon is unable to obtain proximal implant support, the ZMR XL Hip System should be considered. The ZMR XL Hip System was specifically designed to accommodate cases in which proximal support is not obtainable with the standard junction components. However, as with any non-supported femoral stem, the patient would be warned of the increased risk of fatigue fracture of the stem even though a ZMR XL construct is used.