Dakota is a 14-year-old boy who just noticed a rash at his ankles. There is no history of exposure to ill people or other agents in the environment. He has a slight fever in the office. The rash consists of small, bright red marks. When they are pressed, the red colour remains. What should you do?

Correct Answer: B

Rationale: Correct Answer: B (Consider admitting the patient to the hospital) Rationale: 1. Dakota is a 14-year-old boy with a sudden rash, slight fever, and no known exposure. 2. The rash is non-blanching which indicates a serious underlying condition like meningococcal infection. 3. Meningococcal infection can progress rapidly, leading to life-threatening complications. 4. Hospital admission allows for close monitoring, diagnostic tests, and prompt treatment if needed. Summary of other choices: A: Steroid cream is not appropriate as the rash could be a sign of a serious infection, not just inflammation. C: Relying on reassurance without proper evaluation can delay necessary treatment. D: Following up in 3 days may be too late if the condition worsens rapidly.

Correct Answer: D

Rationale: The correct answer is D because in supine position with knees flexed to 90 degrees and feet flat on the table, the right knee being anterior to the left knee indicates that the right femur is longer. This is due to the natural anatomical alignment of the femurs in relation to the knees. The other choices (A, B, C) do not accurately reflect the correct method of determining femur length discrepancy in this specific position. Choice A and B focus on the height of the knees, which may not be an accurate indicator of femur length. Choice C refers to the anterior positioning of the left knee, which is not a reliable indicator of femur length discrepancy.

Correct Answer: C

Rationale: The correct answer is C because the popliteus muscle externally rotates the femur on the tibia during a closed chain movement, such as when the foot is fixed on the ground and the leg rotates. This action helps unlock the knee by initiating the screw-home mechanism, allowing for smooth knee extension. A: Incorrect because the popliteus muscle does not internally rotate the femur on the tibia during an open chain movement. B: Incorrect because the popliteus muscle does not externally rotate the tibia on the femur during an open chain movement. D: Incorrect because the popliteus muscle does not internally rotate the tibia on the femur during a closed chain movement.

Correct Answer: C

Rationale: To measure for leg length discrepancy accurately, you should measure from the Anterior Superior Iliac Spine (ASIS) to the Medial Malleolus. This is because the ASIS is a reliable and consistent bony landmark for measurement, and the medial malleolus is a stable reference point at the ankle joint. Measuring from ASIS to Medial Malleolus ensures that the entire length of the leg is accounted for, providing an accurate assessment of any potential length difference between the two legs. This measurement technique is commonly used in clinical practice and research studies to assess leg length inequality. Summary: A: Incorrect - Does not account for the full length of the leg. B: Incorrect - PSIS is not commonly used as a reference point for leg length measurement. C: Correct - ASIS to Medial Malleolus provides an accurate measurement of leg length discrepancy. D: Incorrect - PSIS is not commonly used for measuring leg length, and measuring

Correct Answer: D

Rationale: The correct answer is D: Stridor. Stridor is a monophasic, high-pitched sound typically heard during inspiration and caused by partial obstruction in the upper airway. It indicates a potentially serious condition affecting the airway, such as swelling or a foreign body obstruction. Wheezing (A) is a continuous, musical sound usually from lower airway obstruction. Ronchi (B) are low-pitched, coarse sounds from airway secretions. Crepitus (C) is a crackling sensation caused by air under the skin or tissues. In this case, Stridor is the most appropriate choice given the description of the sound and its association with upper airway obstruction.