Hips sometimes suffer from stress under weight and years of use. In these cases, replacements give the patient a new lease on full mobility. Sizes of hips differ with each individual. 3-D models can be used to determine which replacement size to use in surgery. This saves time in the operating room and can result in shorter recovery times. Broken hips often may heal on their own if the point of breakage aligns. When the fractured bone ends do not meet, this often requires pinning. A 3-D model can be used along with x-rays in pre-planning surgery to determine the route to realigning the bone and target placement of pins. This can save on recovery time and money by avoiding additional surgeries.