| Course | DNRS 6501 Advanced Pathophysiology (DNP level) |
|---|---|
| Week | Week 9 |
| Paper type | Discussion post with two peer replies |
| Length | About 540 words, 3 pages |
| Format | Discussion post, APA 7 citations |
| School | Walden University |
| Program | Doctor of Nursing Practice (DNP) |
| Updated | October 2026 |
Free sample paper for DNRS 6501 Week 9
Week 9 Discussion: Initial Post
A Foot That Slaps: Deciding Between a Nerve at the Knee and a Root in the Spine on What Is Not Weak
A composite 46-year-old man, 4 months after bariatric surgery and 30 kg lighter, noticed a week ago that his right toes catch on stairs and his right foot slaps the floor when he walks. He cannot lift the front of his foot or his big toe against resistance, and turning the foot outward is weak. The skin over the top of his foot and lower outer leg feels numb.
Candidate one is a lesion of the common fibular (peroneal) nerve where it winds around the neck of the fibula, a site where the nerve lies superficially and is easily compressed, especially after rapid weight loss removes the fat that cushions it (Stewart, 2008). If it were operating, dorsiflexion and toe extension (deep branch) and eversion (superficial branch) would be weak, sensation would be reduced over the dorsum of the foot and lateral leg, and everything supplied by other nerves would be spared: inversion, which depends on tibialis posterior via the tibial nerve, and hip abduction. The ankle reflex would be normal, and there would be no back pain (Marciniak, 2013).
Candidate two is an L5 radiculopathy. The L5 root supplies tibialis anterior and extensor hallucis longus through the fibular nerve, but it also supplies tibialis posterior through the tibial nerve and gluteus medius through the superior gluteal nerve. If it were operating, dorsiflexion, toe extension, and eversion would be weak, but so would inversion and hip abduction, because the root lies upstream of the branching. Pain radiating from the back down the leg would be expected, and the sensory loss would overlap the fibular pattern (Stewart, 2008; McCance & Huether, 2019).
I decide for the fibular nerve at the fibula, and I decide on an absence. His inversion is full strength against resistance, and so is hip abduction side-lying. He has no back or radicular pain, and his ankle reflex is normal. An L5 lesion strong enough to drop the foot should weaken inversion; its absence places the lesion distal to the point where the tibial nerve separates from the fibular, which, with a history of rapid weight loss, points to the fibular head. Tapping over the fibular neck reproduces tingling down his shin, which fits, but I would not rely on it alone.
What finding would overturn this? I think denervation in tibialis posterior or the lumbar paraspinal muscles on electromyography would. Is there a finding at the bedside that would do the same?
Reply to Tiffany
Tiffany, your case of hand weakness chose a C8 root over an ulnar nerve lesion because of the numb little finger. That finding is shared by both. What about thumb abduction, which is median-supplied from C8 and T1 and should weaken with a root lesion but not an ulnar one? If it is normal, would you change your answer?
Reply to Andre
Andre, I agree that your patient's shoulder weakness points to the axillary nerve, but your post decided on the deltoid weakness, which a C5 root lesion would also produce. The absent finding that would decide it is in the rotator cuff: infraspinatus is C5 through the suprascapular nerve. Did you test external rotation?
References
Marciniak, C. (2013). Fibular (peroneal) neuropathy: Electrodiagnostic features and clinical correlates. Physical Medicine and Rehabilitation Clinics of North America, 24(1), 121-137. https://doi.org/10.1016/j.pmr.2012.08.016
McCance, K. L., & Huether, S. E. (2019). Pathophysiology: The biologic basis for disease in adults and children (8th ed.). Elsevier.
Stewart, J. D. (2008). Foot drop: Where, why and what to do? Practical Neurology, 8(3), 158-169. https://doi.org/10.1136/jnnp.2008.149393
Reading the DNRS 6501 Week 9 instructions
A neurological thread usually appears late in the term, asking you to explain a presentation by locating the lesion and its mechanism. You describe the deficit, propose where in the nervous system the problem sits, and support the choice with examination findings and pathophysiology. Doctoral prompts often want at least two candidate sites compared, with the finding that separates them named outright. Cite the course text and one or two primary or clinical review sources in APA 7. The post should stay with one patient and keep its findings consistent. Some instructors ask for the next diagnostic step, such as nerve conduction studies or imaging, with a reason. Before Sunday, answer two classmates, each time adding a point their post missed.
How this DNRS 6501 Week 9 example is built
The post is four paragraphs and stays inside a single deficit throughout. It opens by describing what was lost in functional terms rather than by naming a syndrome, which keeps both mechanisms available to the reader. The second and third paragraphs give each candidate the same treatment: where the lesion or process would sit, what else would be expected if it were operating, and which of those expectations the case does not show. The fourth paragraph decides, and it decides on an absence rather than a presence, which is the harder and more convincing move. Three citations sit inline, two of them primary. The closing question asks what finding would overturn the decision, which invites a reply with something to work on.
Reading the DNRS 6501 Week 9 rubric
Late-term threads are read more severely than early ones, and fluency stops earning credit around here. The analysis share follows whether the post distinguishes rather than describes, so two accurate mechanism accounts with no decision between them score as knowledge alone. Reasoning from absent findings is the single most reliable way to move into the top band in a week like this, because it demonstrates the writer knows what each mechanism predicts. Sections also read for whether the deficit stayed constant, as posts that quietly change the case to fit a preferred explanation lose more than they gain. Reply credit remains its own criterion, and by the ninth week most sections expect responses that cite something rather than responses that recall a shift.
Common DNRS 6501 Week 9 mistakes, and how to avoid them
Posts on foot drop most often lose credit by listing causes from the spine to the muscle without choosing among them. Commit to one site and show why the alternative is less likely. The finding students skip is the one that is normal, yet preserved inversion is what argues against an L5 root lesion in this case. Another mistake is describing the anatomy correctly but forgetting the patient's history, which here points straight at the fibular head. Avoid diagnosing with certainty when the examination supports only a likely site; name the test that would confirm it. Keep strength grades and sensory findings the same throughout the post. In replies, question a single localizing claim with evidence rather than restating the classmate's case. Check eponyms and nerve names for consistency.
Get a DNRS 6501 Week 9 example written to your instructions
Send the prompt, any case the classroom supplied, and the section's reply expectations, and a post that decides between two mechanisms comes back to you. The first custom one is free and lands inside 24 to 48 hours. An exam written up for someone real belongs in their chart rather than in a sample.
More DNRS 6501 papers and DNP samples
- DNRS 6501 Week 1: Discussion Post
- DNRS 6501 Week 2: Concept Map
- DNRS 6501 Week 3: Case Analysis
- DNRS 6501 Week 4: Evidence Appraisal
- DNRS 6501 Week 5: Discussion Post
- DNRS 6501 Week 6: Pathophysiology Brief
- DNRS 6501 Week 7: Differential Analysis
- DNRS 6501 Week 8: Journal Club Critique
- DNRS 6501 Week 10: Case Presentation
- DNRS 6501 Week 11: Synthesis Paper
- DNRS 6521 Week 9: Formulary Review
- NURS 6914 Week 9: Program quality plan
- NURS 6001 Week 9: Three-source synthesis
- NURS 6912 Week 9: Family teaching plan
DNRS 6501 Week 9 questions, answered
Should the post name a diagnosis at all?
It can close on one, and the example arrives at a mechanism that implies a familiar label without leading with it. What costs points is opening on the name, because the thread then becomes a description of something already settled. Mechanism courses generally grade the reasoning that reaches the label rather than the label itself.
Are two candidates enough this late in the term?
Two, argued to a decision, beat four described in parallel in almost every rubric of this kind. Depth is what the later weeks are testing. If your prompt asks for a broader differential, the same matched treatment applies to each candidate, with the deciding paragraph doing more work at the end.
How long should a doctoral post run?
Most sections publish a word range in the classroom rather than in any public document, and the range varies. The example runs four compact paragraphs, which fits the common expectations without padding. Where a minimum is set, the defensible way to reach it is one more argued claim rather than a restatement of the case in fresh words.
Where can I find a free DNRS 6501 Week 9 sample paper?
The full foot drop post and its two replies are here; margin notes show how the examination findings decide between a nerve at the knee and a root in the spine.
How do you tell fibular nerve palsy from L5 radiculopathy in DNRS 6501 Week 9?
Look at what remains strong. Foot inversion and hip abduction draw on L5 through other nerves, so keeping them points to the fibular nerve, while weakness in both suggests the root.