A hip arthroplasty prosthesis for treating a patient condition includes a stem portion configured to penetrate into the bone of a femur of the patient, and includes a head portion formed of a polymeric material and being fixedly attached to the stem portion. The head portion may include a spherical portion with a diameter sized to match the diameter of an acetabulum of an adult patient in a manner permitting the acetabulum to interface with and articulate relative the head portion over a distributed portion of the head portion.
