An endoprosthesis for delivery in a body lumen can be configured to inhibit structural fatigue, crack formation, and elastic recoil while providing improved crimping and expansion uniformity and radial strength. As such, the endoprosthesis can include at least one multi-stage crest element connecting adjacent bar arms. The multi-stage crest element and, optionally, the connection or transition between the multi-stage crest element and the bar arms can form a plurality of undulations or curves to improve the distribution of the strains experienced by the endoprosthesis. The improved strain distribution can improve the structural integrity and prevent failure of the endoprosthesis.