Joint Pathology, Set 2

For each of the following patients, select the most likely pathologic finding:

1. A 55-year-old woman has pain on movement of her right ankle and left knee. Aspiration of joint fluid from her left knee reveals turbid fluid which microscopically contains neutrophils and pyrophosphate crystals:

2. A 32-year-old man has experienced increasing pain on movement of his right elbow after vigorous exercise. Aspirated fluid from the joint space is clear, with few inflammatory cells:

3. For months, a 28-year-old woman has been bothered by painful, swollen, warm, tender PIP and MP joints of her hands and feet. Over the next 10 years she has exacerbations and remissions, but joint deformity continues until her fingers have marked ulnar deviation and swan-neck deformities:

4. A 19-year-old man had the onset of pain and swelling in his right knee over the past two days. Aspiration of joint fluid reveals many neutrophils, some of which contain gram negative diplococci:

5. Over the past 6 months, a 61-year-old woman has a progressive flexion contracture of the 4th finger of her left hand. There is no significant pain on palpation, only increased firmness to the palm:

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