Abstract: The invention is directed to a modular humeral prosthesis for implantation into a humerus of a patient. The prosthesis includes a proximal humeral component having a platform disposed on an upper end. A tapered projection is disposed on the platform. A cup-shaped fracture cap having a tapered opening with generally the same shape as the tapered projection is removably disposable on the tapered projection. The fracture cap is shaped so as to allow for space between the cap and the glenold of a patient into whom the prosthesis is to be implanted and thereby allow the bones of the patient's humeral head to be reconstructed by reassembling and securing the bone fragments about the fracture cap. The prosthesis further includes a humeral head having a tapered opening which may be disposed on the proximal humeral component. The humeral head is interchangeable with the fracture cap.