Joint Disorders

A 65-year-old male presents with chronic knee pain, worse with activity and relieved by rest. Physical examination reveals crepitus and mild effusions. Which of the following radiographic findings is *least* characteristic of osteoarthritis?

A 45-year-old female with a long-standing history of rheumatoid arthritis presents with progressive hand deformities. Which of the following deformities is characterized by hyperextension of the proximal interphalangeal (PIP) joint and flexion of the distal interphalangeal (DIP) joint?

A 30-year-old male presents to the emergency department with acute onset of severe pain, swelling, and warmth in his right knee, accompanied by fever and chills. He has no history of trauma. On examination, the knee is exquisitely tender, and range of motion is severely limited due to pain. What is the most appropriate *initial* diagnostic and therapeutic step?

A 55-year-old male presents with sudden onset of excruciating pain, redness, and swelling in his right great toe. Synovial fluid analysis is performed. Which of the following findings is most characteristic of gout?

A 28-year-old male presents with chronic low back pain and stiffness, worse in the morning and improving with activity. He also reports recurrent episodes of eye redness and pain. Which of the following extra-articular manifestations is most commonly associated with this condition?