A measurement system for installation of a prosthetic component. The measurement system comprises a housing, a slide block, a medial plate, a lateral plate, a fixed plate, and a threaded shaft. The fixed plate couples to the housing. The threaded shaft couples to the slide block. The threaded shaft is rotated to move the slide block within the housing. The slide block includes a free wheel gear. A medial plate and a lateral plate respectively couple to a medial post and a lateral post. The medial post and lateral post each have gear teeth that is configured to couple the free wheel gear. The housing retains, aligns and supports movement of the medial and lateral post parallel to the slide block. A medial brake and a lateral brake is configured to couple to the medial post and the lateral post to prevent movement under user control.