SLOB

Two shallow hips with similar uncovering. But one for sure has acetabular wall deformation as Shenton's Line reveals. That can be made less but securing it = S.L.O.B.

The spherical ball has a center (x) The socket likwise has a center (x

They must be the same center. Drift of the two centers of curvature is what is called DISPLACEMENT aka SUBLUXATION. We get a good clue that displacement has happened from Shenton’s line as seen above. A very shallow hip without any subluxation can have a lot of “uncovering” if the socket is simply “shallow”.