Correction of lower limb deformity in an adult patient with Ellis-van Creveld syndrome: a rare case report.

Ellis-van Creveld syndrome (EVC) is a rare disorder with marked valgus knee deformity, and orthopedic surgeons may experience challenges with lower limb treatment. Most previous reports have focused on EVC in childhood and few on its treatment in adulthood. Our patient was a 23-year-old woman with bilateral knee pain and gait abnormalities, with no history of orthopedic treatment. Valgus knee deformities with anterolateral depression of the lateral tibial plateaus and external rotation deformities of the lower legs were observed on radiography. We performed extra-articular osteotomy of the femurs and tibias and soft tissue release. Although the correction of each femur and tibia was good, mild valgus deformity of the lower limbs remained. This may be because the depression of the lateral tibial plateau was not repaired, and no postoperative remodeling was performed. However, 10 years post-surgery, no recurrence of the deformity was observed and walking was stable without pain.