A combination of the medial displacement calcaneal
osteotomy with the Evans lateral column-lengthening
osteotomy has been suggested when hindfoot valgus, forefoot abduction, and midtarsal
joint instability are significant. However, the deforming forces must be flexible. The goal of this procedure is to restore alignment, stabilize the foot, and improve overall function. This double-calcaneal
osteotomy addresses all components of the
pes planus deformity. This article reports the use of a unilateral
external fixator to callus distract the Evans calcaneal
osteotomy while compressing the posterior medial calcaneal displacement
osteotomy, which to the authors' knowledge has not been performed or reported in the literature. At the final post-operative visit of this clinical patient, the foot was rectus, and X-rays demonstrated an increased calcaneal inclination angle from 10 degrees preoperatively to 15 degrees postoperatively, a decreased talar declination angle from 39 degrees preoperatively to 26 degrees postoperatively, and the cuboid abduction angle decreased from 32 degrees preoperatively to 9 degrees postoperatively. The patient was
pain free and extremely satisfied with the surgery, especially with the use of the
external fixator.