29th September 2020

A boy presents to his GP with a 6 month history of gradual onset lower back pain

A boy presents to his GP with a 6 month history of gradual onset lower back pain. He reports the pain as worse at night, relieved by exercise and a grossly swollen and inflamed left index finger. Blood tests reveal an elevated ESR, CRP and HLA-B27 +ve.

For the description above, please match the SINGLE most likely clinical manifestation of Ankylosing Spondylitis. Select ONE option from the list above.