<prompt> Triple deformity of knee is classically seen in -a Fracture patellab Tuberculosisc Rheumatic arthritisd Rheumatoid arthritiscdabbd  <response>: Triple deformity of knee refers to : -Flexion of kneeExternal rotation of tibiaPosterior subluxation of tibiaTriple deformity is seen in RA, TB of knee and Polio. 