<prompt> The joint commonly involved in sphffitic arthritis is-HipShoulderWristKnee  <response>: Syphilic arthritisSyphilic arthritis may be seen in congenital or acquired syphilis.Congenital syphilisThe joint may be affected early or late : -Early congenital syphilis : - Osteochondritis in juxta-epiphyseal region results in breakdown of the bone and cartilage.Late congenital syphilis : - Painless synovitis at puberty is called cluttons joint. Most common site is knee followed by elbow, and often is bilateral.Acquired syphilisJoint may be involved in the secondary or tertiary stage.Secondary stage : - Transient polyarthritis.Tertiary stage : - Gummatous polyarthritis, Chorcots neuropathic joint. 