Scenario 14: Osteoarthritis (OA)

Scenario 14: Osteoarthritis (OA)
A 57-year-old male construction worker comes to the clinic with a chief complaint of pain in his right hip. The pain has progressively gotten worse over the last 2 months and he has been having trouble sleeping. There is little pain in the morning, but he is a bit stiff. The pain increases as the day wears on.  has taken acetaminophen without any relief but states that the ibuprofen does work a little bit. He is anxious since the hip pain has limited his ability to work and he is afraid that his boss will fire him if he cannot perform his usual duties. There is no history of past trauma or infection in the joint. Past medical history noncontributory. Social history without history of alcohol, tobacco, or illicit drug use. Physical exam remarkable for decreased range of motion of the right hip. BMI 34 kg/m^2. Radiographs in the office demonstrated asymmetrical joint space narrowing of the right hip with osteophyte formation. Several areas of the hip showed bone-on-bone contact with loss of the articular cartilage. The APRN tells the patient he has osteoarthritis (OA) and refers the patient to an orthopedist for evaluation of his need for a total hip replacement.
Question:
Describe how osteoarthritis develops and forms and distinguish primary osteoarthritis from secondary arthritis.   
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