Real-life, observational, monocentric, ambispective study, carried out in France. The aim of the study is to evaluate the success rate of orthopedic management of the Z-foot after at least 9 months of follow-up.

The study will include a single prospective data collection, which will make it possible to obtain prospective clinical data at the longest follow-up after treatment, with a minimum follow-up of 9 months. This collection will be done during a visit to the office or a phone call, depending on the preference of patients and their parents.

Early data (before the intervention, immediately after, and at 3 months of follow-up) will be collected retrospectively in medical records.

Inclusion Criteria:

• Child having presented a congenital idiopathic malformation uni- or bilateral of foot in Z, defined by the presence of an angular adduction of the mid-forefoot and a dorsolateral hump;
• Orthopedic treatment with femoropedic plasters and slotted splints in 1st intention, having started at least 9 months before inclusion;
• Child aged 6 months to 2 years at the start of care;
• Authorization of the parents or the legal representative of the child to collect personal information about their child.

Exclusion Criteria:

• Child having presented a secondary Z foot;
• History of foot surgery;
• Lack of retrospective data to assess the convexity of the external edge of the foot before orthopedic care;
• Inability of the parents or the child's legal representative to understand the study protocol.

Children who suffered from a congenital idiopathic Z-foot deformation, aged 6 months to 2 years at the time of orthopedic treatment.