Foot deformations occur in 93% of children with cerebral palsy (CP) leading to disabilities. Forefoot and backfoot deformations are well described, but data regarding midfoot deformation are lacking. This study aim (1) to quantify prevalence of midfoot deformation in the impaired and non-impaired foot of walking children with unilateral CP, (2) to evaluate correlations between Midfoot and backfoot deformation, lower limb torsionnal disturbance, distal selective motor control, or lower limb spasticity. A retrospective study was conducted on children with unilateral CP who benefited from a 3D motion analysis in Brest (France) between 2006 and 2017. Clinical data regarding midfoot deformation were collected and classified as typical axe, Metatarsus adductus (MAdd) or metatarsus abductus (MAbd). Data regarding backfoot and ankle deformation; Modified Ashworth Scale of lower limb muscles; leg length discrepancy; tibial torsion and femoral anteversion; distal selective motor control were also collected. Data from 70 children (GMFCS I, II, III) with unilateral CP were analyzed. Mean age was 10.13 years (SD = 0.51). 35 males were included. 35 (50%) impaired feet presented a MAdd, 5 (7.2%) a MAbd and 30 (42.8%) had a typical axis. 24 (34.3%) non-impaired feet had a MAdd, 4 (5.7%) had a MAbd and 42 (60%) had a typical axis. Prevalences [h1] were statistically different between groups. In the impaired side, significant correlations between MAdd and poor foot dorsiflexion control (Boyd scale) ( P = 0.01) and between MAdd and tibialis posterior spasticity ( P = 0.04) were found. MAdd seems to be the most frequent midfoot deformation in children with unilateral CP. If prospectives studies confirm the role of tibialis anterior and posterior in the midfoot deformities then prevention strategy should focus on these two targets.