Acetabular revision. Classification and treatment

Several different defect classifications have been published. The most comm only used are described. For clinical practice, differentiation between "co ntained" and "noncontained" or segmental defects has proven useful. If the acetabular rim provides support, press-fit cups can be used without screws. With an appropriate reaming technique, it is possible to create a sufficien tly supportive bed for the implant in many cases. This allows the use of a press-fit ace-tabular component over a wide range of defects as long as a t ilting of the cup can be avoided. Between 1988 and 1995, 439 acetabular cup s were revised at the Orthopedic University Clinic in Basel, 171 of them us ing the Morscher press-fit cup. After a mean follow-up of 7.1 years, not a single cup had to be revised for aseptic loosening. The 9.5% dislocations were due to abductor insufficiencies because of troch anteric pathologies or muscular alterations from former approaches.