The JBJS Quiz of the Month is a collection of 10 relevant questions from each orthopaedic subspecialty. The questions are drawn from JBJS Clinical Classroom, which houses over 4,500 questions and 3,100 learning resources. Take the Quiz to see how you score against your peers!

NOTE: This quiz does not earn users CME credits. The questions must be answered within Clinical Classroom to earn CME credits.

A 30-year-old female patient with psoriasis presents with pain in the toes. Which of the following are the radiographic findings that are most consistent with psoriatic arthritis?

  • Sclerosis with subchondral cyst formation
  • This is often seen with post-traumatic arthritis.

  • Pencil-in-cup deformity of the digits
  • This results from periarticular erosions and bone resorption, giving the appearance of a pencil in a cup.

  • Diffuse resorption
  • This is typical of rheumatoid arthritis.

  • Multiple dislocated joints
  • This is typical of rheumatoid arthritis.