<prompt> What is true about Salter-Harris type IV epiphyseal injury:Fracture occur through growth plate onlyFracture occur through growth plate metaphy- sis onlyFracture occur through growth plate, metaphysic epiphysisFracture occur through epiphysis only  <response>: Ans: C Fracture occur through growth plate, metaphysic epiphysis SALTERHARRIS FRACTURES are nine types of Salter-Harris fractures; types 1 to V as described by Robert B Salter and W Robert Harris in 1963, and the rarer types V! to IX which have been added subsequently:Type I - A transverse fracture through the growth plate also referred to as the physis: 6 incidenceType II - A fracture through the growth plate and the metaphysis, sparing the epiphysis: 75 incidence, takes approximately 2-3 weeks to heal.Type III - A fracture through growth plate and epiphysis, sparing the metaphysis: 8 incidenceType IV - A fracture tb rough all three elements of the bone, tbegrowth plate, metaphysis, and epiphysis: 10 incidenceType V - A compression fracture of the growth plate resulting in a decrease in the perceived space between theepiphysis and diaphysis on x-ray: 1 incidenceType VI -Injury to the peripheral portion of the physisand a resultant bony bridge formation which may produce an angular deformity added in 1969 by Mercer RangType VII - Isolated injury of the epiphyseal plate VII--IX added in 1982 by JA OgdenType VIII - Isolated injury of the metaphysis with possible impairment of endochondral ossificationType IX - Injury of the periosteum which may impair intramem bra nous ossificationThe mnemonic SALTR can be used to help remember the first five types: This mnemonic requires the reader to imagine the bones as long bones, with the epiphyses at the base,I - S Slip separated or straight across, Fracture of the cartilage of the physis growth plateII - A Above. The fracture lies above the physis, or Away from the joint.III - L Lower. The fracture is below the physis in the epiphysis.IV - TE Through Everything. The fracture is through the metaphysis, physis, and epiphysis.V - R Rammed crushed. The physis has been crushed, alternatively SALTER can be used for the first 6 types - as above but adding Type Vr E for Everything or Epiphysis and Type VIR for RingFig: Types of Salter-Harris fractures 