A Minimally Invasive Novel Technique Using a New Device to Treat Proximal Femoral Cystic Lesions

INTRODUCTION: Bone grafts are widely performed to fill bone cavities and accelerate bone ingrowth. Advances in minimally invasive surgical techniques to treat bone tumors provide the impetus for minimally invasive bone graft procedures. A special funnel with an inner plunger has been manufactured specifically for the delivery of bone graft substitutes. TECHNIQUE: Secondary bone cysts in two patients with fibrous dysplasia (a 42-year-old male and a 36-year-old female) were treated with the bone graft substitute β-tricalcium phosphateby implantation through a small fenestration in the greater trochanter using a special funnel. Bone consolidation has been observed at about 6 months after the surgery. CONCLUSIONS: Secondary bone cysts in two patients with fibrous dysplasiaare presented as representative cases for this method. The funnel was particularly useful for proximal femoral cystic lesions, as a solitary bone cyst; it facilitated a minimally invasive surgical procedure without the need for curettage. Small fenestrations reduce the likelihood of surgery-related fractures. Long-term follow-up is necessary to confirm the method and is capable of curing secondary bone cysts in patients with fibrous dysplasia.