Periprosthetic fractures of the greater trochanter through osteolytic cysts with uncemented MicroStructured Omnifit prosthesis: Retrospective analyses of 23 fractures in 887 hips after 5-14 years

Background: Periprosthetic fractures of the greater trochanter through osteolytic cysts are rare. The proper treatment and its influence on the prosthetic survival remains unknown. Patients and methods: We retrospectively evaluated 887 hips with uncemented MicroStructured Omnifit total hip prostheses at a mean follow-up time of 11 (5-14) years. We found 23 (2.6%) fractures of the greater trochanter through a cystic lesion, occurring 4-11 years postoperatively. Results: Nonoperative treatment healed 15 of the 17 fractures that were minimally displaced. At a mean follow-up of 3 (2-5) years after the fracture, 16 had had revision of the components because of excessive wear, loosening, or nonunion. Interpretation: We conclude that a periprosthetic fracture of the greater trochanter through an osteolytic lesion is usually stable and heals without treatment. However, it is associated with poor prosthetic survival because of excessive polyethylene wear. Copyright