Achondroplasia is a skeletal dysplasia (dysplasia - abnormal growth or development), also identified as a rare bone disease. Achondroplasia is the most common form of chondrodysplasia and occurs due to mutations in the fibroblast growth factor receptor 3 (FGFR3) gene, encoding a transmembrane receptor (a protein that spans the membrane of cells) that is important in regulating linear bone growth, among other functions. It is estimated that its incidence is about 1/25,000 live births worldwide and some of the characteristic clinical features, listed below, are visible at birth: rhizomelia - disproportion of the length of the proximal limb; exaggerated lumbar lordosis - excessive curvature of the lower back; brachydactyly - the shortness of the fingers is relative to the length of other long bones and other parts of the body, the hands are also broad, short and trident shaped; macrocephaly and frontal bossing - is an unusually large head with a prominent forehead; thoracolumbar kyphosis - it is due to mechanical factors, specifically the general muscular hypotonia which, along with small limbs, small neck and large head, make achievement of gross motor skills (larger movements) slower than typical; genu varus - is a physical deformity marked by outward bowing of the lower leg in relation to the thighbow legs. Most joints can be hyperextensible. The main goal of this final paper is to show the biomechanical assessment of posture in people with achondroplasia through measurements and tests.