<prompt> Commonest deformity in Rickets isGenu valgumGenu recurvatumTibia KyphorumCubitus valgus  <response>: Ans. a Genu valgum. Ref. Maheshwari, Orthopaedics, 2ndpg.262RICKETSFaculty mineralisation of the bone before the fusion of growth plate i.e., during enchondral bone growth, is known as rickets.Pathophysiology Low levels of vitamin D3 reduced calcium absoption raised PTH increased bone resorption, increased renal reabsorption, increased phosphate excretion low bone calcium, low serum phosphate decreased mineralization rickets X-ray Features include Children- Poorly mineralized epiphyseal centers with delayed appearance.- Increased distance between end of shaft epiphyseal center.- Reaction of periosteum may occur with Indistinct cortex.- Coarse prominent trabeculations with decreased bone density- Epiphyseal plates widening irregularity EARLIEST RADIOLOGICAL SIGN- Fraying, splaying cupping of metaphysis.- Enlargement of epiphysis at radial end of long bones.- Spur metaphyseal projecting at right angles to metaphysis in the cortex.- Deformities like bowing of long bones genu valgum, genu recurvatum, frontal bossing.- Ricketic rosary, Rachitic pelvis- Harrisons sulcus constant pulling of diaphragm on soft lower ribs seen at subcostal region- Delayed eruption of temporary teeth Infants:- Delayed development, Hypotonia, Craniotabes, and Patent anterior fontanella. 