title: [Pretibial pseudocyst after anterior cruciate ligament reconstruction with a biocomposite screw].
abstract: We report the case of a patient who presented a pretibial extra-articular cyst two years after an arthroscopically assisted ACL reconstruction using an autologous bone-patellar tendon-bone graft. The tibial fixation was achieved with a bioabsorbable screw made of poly-L, D-lactic and -tricalcium phosphate (-TCP). A subcutaneous pseudocystic lesion was excised. It consisted of a capsular fibrous tissue with minimal milky fluid (1 ml) centrally. It penetrated into the tibial tunnel but did not communicate with the knee joint space. The histopathological analysis demonstrated fibrous tissue with multinucleated giant cells and refractile particles which suggested a foreign body reaction. After the surgery, the patient recovered perfectly well and he returned to his pre-injury level of physical activity in two months. To the best of our knowledge, this is the first report of this complication in a patient with a biocomposite screw made of poly-L, D-lactic and -tricalcium phosphate (-TCP).
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital General Universitario Gregorio Marañón, Madrid, España.
authors.forename: B
authors.initials: B
authors.lastname: Alonso
authors.affiliation: Cirugía Ortopédica y Traumatología, Hospital Infanta Cristina, Madrid, España.
authors.forename: F B
authors.initials: FB
authors.lastname: Sobrón
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital General Universitario Gregorio Marañón, Madrid, España.
authors.forename: C
authors.initials: C
authors.lastname: Vidal
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital General Universitario Gregorio Marañón, Madrid, España.
authors.forename: J
authors.initials: J
authors.lastname: Vaquero
mesh_terms: D020341:Absorbable Implants; D016118:Anterior Cruciate Ligament; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction; D001863:Bone Screws; D006801:Humans; D008297:Male; D013977:Tibia / Q000601:surgery
keywords: Pseudocyst; anterior cruciate ligament; screw; β-tricalcium phosphate