RT Journal Article T1 A 28-Year-Old Woman with Down Syndrome, Congenital Heart Disease, and a History of Knee Surgery and Plantar Fasciitis, with Hallux Abducto Valgus (Bunion) and Lapiplasty Three-Dimensional Correction Surgery A1 Simón-Pérez, Eduardo A1 Jiménez-Martín, Rodrigo A1 Cicchinelli, Luke D A1 Fernández-Yagüe, Javier A1 Simón-Pérez, Clarisa A1 Páez-Moguer, Joaquín A1 Cortés-Rodríguez, Antonio A1 Castillo-Domínguez, Alejandro K1 Down, Síndrome de K1 Cardiopatía congénita K1 Rodillas - Cirugía AB Background: Tarsometatarsal joint (TMJ) arthrodesis is common method used for correcting hallux abductus valgus (HAV). Its popularity has grown due to studies revealing HAV’s triplanar deformity with frontal plane rotation. This case report presents a 28-year-old woman with Down syndrome, congenital heart disease, and a history of knee surgery and plantar fasciitis, with severe HAV deformity and flexible valgus flatfoot associated with ligamentous hyperlaxity.Case Report: Examination revealed severe foot deformities, and radiographic studies confirmed the condition. A surgical intervention was planned, and the patient’s cardiologist confirmed she was fit for the procedure. The modified Lapidus technique with frontal plane rotational correction included realigning the metatarsal joint, resecting spurs, osteosynthesis material, and arthrosis in the sinus tarsi. After surgery, the patient underwent a recovery period without support for 8 weeks and received appropriate medical care. Radiographs showed successful alignment, and the patient gradually resumed her daily activities. The patient had an uneventful recovery, and postoperative radiographs showed good alignment in all planes.Conclusions: The hyperlaxity associated with Down syndrome makes the incidence of HAV more frequent, and TMJ fusion is preferable to correction by osteotomy. The modified Lapidus technique with frontal plane rotational correction could be a good technique to achieve satisfactory correction in patients with severe HAV deformity and flexible valgus flatfoot associated with ligamentous hyperlaxity. TMJ fusion is indicated when severe or recurrent rotational component is observed in X-rays PB Internacional Scientific Information YR 2023 FD 2023 LK https://hdl.handle.net/10630/33241 UL https://hdl.handle.net/10630/33241 LA eng NO Simón-Pérez, E.; Jiménez-Martín, R.; Cicchinelli, L.; Fernández Yagüe, J.; Simón-Pérez, C.; Páez-Moguer, J.; Cortés-Rodríguez, A.; Castillo-Domínguez, A. A 28-Year-Old Woman with Down Syndrome, Congenital Heart Disease, and a History of Knee Surgery and Plantar Fasciitis, with Hallux Abducto Valgus (Bunion) and Lapiplasty Three Dimensional Correction Surgery. Am J Case Rep, 2023; 24: e940879 DOI: 10.12659/AJCR.940879 DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 3 mar 2026