Femoral cam deformity due to anterior capsular force: A theoretical model with MRI and cadaveric correlation.

ABSTRACT:

Background

Cam deformity is associated with epiphyseal extension onto the anterosuperior femoral head-neck before physeal closure. A century ago, anatomists speculated that this femoral prominence acts as a pulley bar to withstand capsular compression in hip extension with pressure concentrated where the zona orbicularis (ZO) joins the iliofemoral ligament (IFL). An animal model has shown that growth plates deflect laterally and distally when exposed to forces perpendicular to growth. These observations raise the question of whether capsular pressure against the epiphysis can stimulate cam formation.

Purpose

The purposes are to measure: (1) the distance from the ZO/IFL confluence to the maximal epiphyseal extension (MEE) and cam apex; and (2) acetabular depth at this locatio

SUBMITTER: Lee CB 

PROVIDER: S-EPMC4936501 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature