Table I.

Possible surgical treatment options at dislocation of THA

Reason for Dislocation	Treatment option
Shortening, laxity	Head exchange (consider offset head)
Anteversion low	Dorsal retainment ring
Cup inclination high	Cranial retainment ring or cup exchange
Cup in retroversion	Cup exchange
Anterior impingement	Remove osteophytes and scar tissue, longer head
Anteversion high	Cup exchange or offset head
Cup horizontal, impingement in flexion	Cup exchange
Multidirectional instability	Bipolar hypermobility cup or constrained cup with head exchange
Deficient abductors	Constrained cup or bipolar hypermobility cup