Limping boys of four and thirteen compared, exam and causes both adjusted for age, including why the teenager's knee pain sends the examination to his hip. Searches like "nu 552 unit 9 assignment example", "nu552 unit 9 sample" and "nu552 unit 9 example" land here.
A Limp at Four and a Limp at Thirteen: A Lifespan Comparison of How the Examination and the Differential Change
[Student Name]
Purdue University Global
NU552: Advanced Health Assessment and Diagnostic Reasoning
Unit 9 Assignment
[Instructor Name]
[Date]
Both children are composites built for the comparison; no real patient is described.
The Two Boys
Leo, 4, had a runny nose and cough last week. Yesterday morning he woke and would not put weight on his right leg. His parents say he has not had a fall they know of. His temperature at home was [37.9] C. He sits happily on his mother's lap but cries when put down to stand.
Marcus, 13, has limped for three weeks. He plays basketball and says his left knee hurts, especially after practice. He cannot recall an injury. His weight is above the 95th percentile for his age. He has no fever.
How the Examination Changes With Age
1. Observation. At four: watch him play on the floor and reach for a toy; note how he gets up and whether he crawls rather than stands. At thirteen: watch him walk the corridor and climb onto the table. Reason: a four-year-old will not perform on request, and play shows function he would refuse to demonstrate; a teenager can follow instructions.
2. Locating the pain. At four: watch where he guards and which movement makes him cry; do not rely on where he points. At thirteen: ask him to point with one finger. Reason: young children localize pain poorly, while a teenager can describe it, but may place it in the wrong joint.
3. Hip rotation. At four: examine the hip last, gently, in his mother's lap, comparing internal rotation on both sides. At thirteen: examine both hips supine, flexing each hip and watching whether the thigh rotates outward. Reason: hip movement is the most painful part of the examination in a child with an inflamed hip and is left to the end to keep his cooperation; in the teenager, obligatory external rotation with flexion is a key sign of a slipped epiphysis.
4. Log roll. Both: roll the thigh gently back and forth with the leg straight. Reason: pain with log roll is specific for hip pathology and requires no cooperation.
5. Knee palpation. At four: palpate after the hip, looking for swelling or warmth. At thirteen: palpate the tibial tubercle, patellar tendon and joint lines. Reason: in the teenager, tenderness at the tubercle suggests Osgood-Schlatter disease, but knee pain can be referred from the hip.
6. Temperature and general appearance. Both: record temperature and how unwell the child looks. Reason: fever and systemic illness raise concern for infection at any age.
Leo's Differential
Examination: afebrile in the clinic at [37.6] C, well-appearing. He holds his right hip slightly flexed and externally rotated, and internal rotation is limited and painful compared with the left. Log roll on the right causes him to cry. The knee and ankle are normal. No bruising or bony tenderness.
1. Transient synovitis. Likelihood: highest. Danger: low. A self-limited inflammation of the hip lining, it is the most common cause of acute hip pain in young children and often follows a viral illness.
2. Septic arthritis. Likelihood: lower, but real. Danger: highest. A bacterial infection of the joint can destroy the cartilage and damage the growth plate within days.
3. Perthes disease. Likelihood: low. Danger: moderate. Loss of blood supply to the femoral head usually causes a more gradual limp.
4. Occult fracture. Likelihood: low. Danger: moderate. A toddler's fracture of the tibia can present with refusal to bear weight, but his tenderness localizes to the hip.
Separating transient synovitis from septic arthritis is the central question. Kocher and colleagues identified four predictors of septic arthritis in children with an irritable hip: a history of fever above 38.5 C, refusal to bear weight, an erythrocyte sedimentation rate above 40 mm/h and a white cell count above 12,000 per microliter (Kocher et al., 1999). In the original study, the predicted probability of septic arthritis rose steeply with the number of predictors present. In a later validation cohort from the same institution, the probabilities were lower at each level, so the rule discriminated less well than it had in the population in which it was built (Kocher et al., 2004). The rule guides the decision to test, not the diagnosis itself, and its probabilities should not be quoted as if they were fixed.
Leo has one predictor, refusal to bear weight. His blood count and inflammatory markers are needed; if they are raised, a hip ultrasound to look for fluid and, if fluid is present, aspiration would be the next steps.
Marcus's Differential
Examination: afebrile. He walks with his left foot turned outward. When his left hip is flexed, the thigh swings into external rotation, and internal rotation is markedly reduced compared with the right. The left knee has no swelling, full range of motion and no tenderness at the tibial tubercle or joint lines.
1. Slipped capital femoral epiphysis. Likelihood: highest. Danger: highest. The femoral head slips off the neck at the growth plate. It is most common in early adolescence, especially in boys and in children with obesity, and often presents with knee pain (Peck et al., 2017). Obligatory external rotation on hip flexion is a classic sign.
2. Osgood-Schlatter disease. Likelihood: moderate before the examination, low after. Danger: low. Traction on the tibial tubercle in active adolescents; no tubercle tenderness.
3. Patellofemoral pain. Likelihood: moderate before, low after. Danger: low. Common in adolescent athletes, but it does not reduce hip rotation.
His knee pain is referred from the hip along the obturator nerve, which supplies both the hip joint and the skin of the inner thigh and knee. An examination confined to the painful knee would have been normal, and the leading diagnosis would have been missed. The step that found it was hip rotation. He needs anteroposterior and frog-leg lateral radiographs of both hips, and until they are reviewed, he should avoid bearing weight on the left leg, because a stable slip can become unstable (Peck et al., 2017).
What Does Not Change With Age
Some principles hold at every age. Fever and refusal to bear weight always raise concern for infection. Hip pathology can present as knee pain in any child, so the hip is examined whenever the knee hurts without a clear cause. A child who cannot bear weight needs an explanation before going home. And in both boys, the dangerous diagnosis sat near the top of the danger column from the start, which is what ensured the examination looked for it.
References
Kocher, M. S., Mandiga, R., Zurakowski, D., Barnewolt, C., & Kasser, J. R. (2004). Validation of a clinical prediction rule for the differentiation between septic arthritis and transient synovitis of the hip in children. Journal of Bone and Joint Surgery, 86(8), 1629-1635. https://doi.org/10.2106/00004623-200408000-00005
Kocher, M. S., Zurakowski, D., & Kasser, J. R. (1999). Differentiating between septic arthritis and transient synovitis of the hip in children: An evidence-based clinical prediction algorithm. Journal of Bone and Joint Surgery, 81(12), 1662-1670. https://doi.org/10.2106/00004623-199912000-00002
Peck, D. M., Voss, L. M., & Voss, T. T. (2017). Slipped capital femoral epiphysis: Diagnosis and management. American Family Physician, 95(12), 779-784.
How this NU552 Unit 9 example is structured
Age is treated as a variable that changes both the examination and the likely diagnoses, and the paper keeps those halves distinct. The exam table explains each adjustment by development or anatomy: a four-year-old cannot localize pain reliably and is examined through play; a thirteen-year-old can describe pain but may feel hip pathology in the knee, referred along the obturator nerve. Both differentials use the same likelihood and danger columns, making the contrast easy to read. Prediction rules are cited with their limits. The teenager's case makes the sharpest point: an exam confined to the painful knee would have missed the leading diagnosis, and the table shows hip rotation as the step that found it. Its last lines note what does not change with age: fever and refusal to bear weight always raise concern for infection.
Get an NU552 Unit 9 example written to your instructions
The ages and complaint for Unit 9 differ between NU552 sections; some compare childhood with late life. Pass along your prompt, the case details and the rubric. A first comparison is free, matched to your instructions and ready in 24-48h, adjusting both the examination and the ranked causes for each age, with a reason written beside every change. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
NU552 Unit 9 questions, answered
Can the comparison be between an adult and an older adult?
Yes, and the method is unchanged. Comparing abdominal pain in a thirty-year-old and an eighty-year-old, for example, would adjust the exam for blunted tenderness in late life and move vascular causes up the differential. The sample adjusts both the examination and the diagnoses for whatever ages the prompt pairs, giving reasons.
Are clinical prediction rules expected here?
Where a well-known rule applies to the complaint, citing it usually strengthens the paper. The sample uses Kocher's criteria for the younger child and states their limits. A rule quoted without its derivation population or validation performance tends to draw comments in reasoning courses, so the caveat carries equal weight with the rule itself.
Should both cases get equal length?
Roughly, though the comparison table does most of the work. The sample gives each boy a short narrative and a ranked differential of similar length, then spends its analytical space on the contrast. A paper treating one age in depth and the other in a paragraph reads as a single case with an appendix.