Case Report: Open Access Lindsay et al. Int J Biol Instrum 2018, 1:001 Citation: Lindsay EA, Abbaschian CE, Copley LA (2018) Proximal Femoral Unicameral Cyst Resolved by Single Injection of a Calcium Phosphate Bone Void Filler without Instrumentation. Int J Biol Instrum 1:001 Copyright: © 2018 Lindsay EA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. *Corresponding author: Copley LA, University of Texas Southwestern, Children’s Health System of Texas, 1935 Medical District Drive, Dallas, USA, E-mail: LAWSON.COPLEY@childrens.com Received: October 06, 2017: Accepted: January 30, 2018: Published: February 01, 2018 VIBGYOR ISSN: 2631-5025 Proximal Femoral Unicameral Cyst Resolved by Single Injection of a Calcium Phosphate Bone Void Filler without Instrumentation Lindsay EA, Abbaschian CE and Copley LA * University of Texas Southwestern, Children’s Health System of Texas, USA Introduction Unicameral Bone Cysts (UBC) are ofen identifed incidentally as a consequence of pathologic fracture due to insufciency of the skeletal architecture at the site of involvement [1,2]. When the cyst involves long bones of the lower extremity, treatment options are ofen dictated by the occurrence of the fracture as well as the anticipa- tion of the persistence of the cyst following fxation or immobilization [3,4]. However, a UBC might occasion- ally be identifed as an incidental fnding prior to frac- ture. Treatment decision making therefore must take into account the relative likelihood of impending patho- logic fracture as well as the latent or active behavior of the cyst [3,5,6]. Tis case report presents the rationale and technical approach to the successful treatment of a proximal femoral UBC in a young child with a single injection of calcium phosphate bone void fller without supplemental fxation. Case Presentation A four-year-old boy from China presented to a ter- tiary pediatric medical center in the United States fol- lowing the incidental fnding of a proximal femoral UBC on plain radiographs. Approximately one year prior to Abstract Unicameral Bone Cysts (UBCs) of the proximal femur are commonly treated with supplemental fxation to avoid the occurrence of pathologic fracture. Occasionally circumstances permit treatment without the need for a more extensile approach with fxation. This case report illustrates successful management of a proximal femoral UBC following a single injection of calcium phosphate bone void fller without instrumentation. presentation, he had a self-limited episode of limping and pain in the lef hip and thigh with no history of trau- ma. By the time the cyst was discovered the boy had no symptoms and was unrestricted in all activities, includ- ing aggressive play. Physicians in China recommended open curettage and autologous bone grafing of the cyst supplemented by internal fxation. Te family travelled to the United States for a second opinion. Alternative treatment options were reviewed with the family. Tese included cyst injection with or without supplemental fxation [3,7,8]. Te risks and benefts were discussed with the family, including the potential need to cross the proximal femoral growth plate with fxation which may lead to growth arrest [7]. Te alternative of cyst injection with a calcium phosphate bone void fller was consid- ered in this case. Tese materials may be mixed in liq- uid form and then solidify at body temperature into a crystalline structure which resembles hydroxyapatite [9]. Biomechanical properties include an average compres- sive strength of 26.5 ± 5.3 mega pascal (MPa) and tensile strength of approximately 4.3 MPa [10]. Tis treatment option was ofered in light of the child’s current absence of symptoms, high level of activity, the latent appear- ance of the cyst, and the assurance of the family that they would be able to restrict the child from aggressive