Acetabular fracture during total hip arthroplasty is a known complication that typically occurs during acetabular component impaction. If noticed intra-op, the stability of the component should be assessed by the surgeon to determine treatment. If the component is stable, no additional treatment is necessary. If the acetabular component is unstable, then it should be changed and/or supplemented with component screws until stability is obtained.
The referenced article by Haidukewych showed no need for acetabular fixation after fracture as long as the acetabular component was deemed stable. In their 7121 cases studied, they had a fracture rate of 0.4% and a high rate of fracture with elliptical monoblock cups. All fractures healed and the acetabular components achieved ingrowth without migration.
Haidukewych GJ, Jacofsky DJ, Hanssen AD, Lewallen DG. Intraoperative fractures of the acetabulum during primary total hip arthroplasty. J Bone Joint Surg Am. 2006 Sep;88(9):1952-6.
PMID: 16951110 (Link to Abstract)