Would like to know DD & how to proceed to investigate

A case of 35yrs old M, experience severe low back pain and movement dysfunctional disorder on rotation actions.....On examination no test accepted as uniqueness... finally x ray has been checked and found out this condition and further processing......

Spotter=45/male, c/o pain and stiffness lower back since long, neglecting, not classical morning stiffness, no breathing difficulties, no ski lesion, but dandruff occasional, no urinary symptoms, buttock pain, no heel pain, no breathing difficulty, reduced chest expansion than normal. Although came to emergency after aggravation of just after fall in bathroom. No dnvd.

A 70 years old male come to clinic with complaints of severe pain in bilateral knee and hip joints since 6 months. He also have decreased hearing bilaterally and poor dentition. He has past medical history of HTN, well controlled with Amlodipine. Routine labs are unremarkable, except for increased Alkaline phosphate, with normal GGT. Bone scan was done which shows characteristics lesions. Diagnosis and management ?

Pt. 53/F, C/O pain n jt stiffness in B/L hands n feet since 7-8 yrs. H/O chicken gunia fever 7-8 yrs ago. O/e, stiffness of MCP pIP n dIP jts of both hands. Ankle n MTP jts stiffness. Clinical pic n ixns attached. Advise, Dx n rx plz.

Hello doctors a 26yrs old female pateint presented with c/o pain at left ankle since 1 yr. on and off swelling, especially while standing for longer hours. Can’t walk long distance H/o abscess 1 yr back. Can you please suggest me the diffential diagnosis and treatment. Thanx