Predisposing factors for dislocation Divide these into:
Patient-specific risk factors (female sex, AVN, obesity, increased age, co-morbidities, femoral neck facture)
Variables under the surgeon’s control (surgical approach, component position and orientation, femoral head size, restoration of offset, preservation of soft tissue integrity, leg length and prosthetic impingement)
Surgeon experience (risk of dislocation inversely related to the case volume of the operating surgeon)
Closed reduction with or without bracing
Greater trochanter advancement.
Dated option as modular implants largely superceeded this choide
Only used if no component mal-alignment,implant well fixed and a young patient.Even with these strict criteria this is often unsuccessful so more of a historic option than something to seriously consider.There are better more successful options available.
THA component revision
Exchange of modular parts
Tripolar unconstrained acetabular component (dual motion)
Elevated rim liners
Use of a large femoral head
Use of a constrained acetabular liner
The choice depends very much on the aetiology of the problem. Revision arthroplasty for recurrent dislocation is much more likely to be successful when a cause has been identified