Another case presentation to learn from. These are not the thousands of boring MSK presentations we all treat, these are the ones that slip the net. All anonymised, with several details changed. As always, these are aimed at professinal clinicians, and are for learning and reflection. This one was not seen in my clinic, but was relayed as a presentation in another establishment.
A 55 year old man presents to his private MSK practitioner with leg pain and weakness. Its been getting worse for a few weeks, but he was putting off seeking advice as it wasn’t that bad. However, having tripped over the rug at home and being unable to walk long distance without pain, he is finally being sent in by his partner.
Presenting complaint
A one month history of lower back pain, insidious onset, non specific location, but across the lumbar spine. No radiation into the legs, but occasional electic sensations in the sciatic region bilaterally. Pain can be somewhat relieved by analgesia, and position, but can be up to 7-8 out of 10. He has now noticed some weakness in the right leg, with his toes catching occasionally on random objects.
Medical History
No cardiovascular history, smokes 10 hand rolled cigarettes a day but no respiratory issues, no GI issues, no GU issues, previous lower back pain,with a slipped disc 10 years previously. A recent swollen knee after walking the dogs on moorland in shorts, which was treated as an infection by the GP with oral antibiotics and analgesia. No bowel or bladder changes. No fatigue, no weight loss, no night sweats, some occasional fevers (described as sweaty moments), which he was putting down to the remnants of the joint infection. He is taking Ramipril for hypertension and Finasteride for benign prostatic hyperplasia, no diabetes.
Social History
Self employed landscape company manager, wife and teenaged children at home, no regular sporting activities but regular manual labour. Moderate diet, 40 units of alcohol per week (mainly beer) and elevated BMI (33).
Examination
Clinical: Nil of Note. MSK exam: Some restriction on foward flexion, pain in lumbar region on sidebending ipsilaterally. Neurological examination: Reduced reflexes on the right lower limb, some subjective sensory change L4-S1 right. Upper limb and cranial nerve examination nil of note.
Working diagnosis
Lumbar disc bulge leading to compression of the sciatic bundle.
Treatment
Conservative soft tissue treatment to relieve pain and spasm, no manipulations used and pain managment techniques suggested. Patient booked for review 1 week.
Follow up
The patient presented the next week with worse pain and increased neurological symptoms. Examination indicated that there was now sensory change in the right L3 dermatome as well as L4-S1, with increasing weakness in the right foot. He also reported some constipation, which he put down to the use of codeine for pain management as per his GP advice. He also commented that he had had a couple more of the hot flushes, especially at night. The working diagnosis was still thought to be discal, if worsening slightly. Treatment was attempted, but no positional relief was found. The patient was safety netted and booked for a teleconsultation in a few days.
On telephoning, the patient reported continued worsening of the symptoms and increased fever. He also reported some hesitancy in urination. At this point he was advised to attend the emergency department at his local hospital.
On arrival at A&E, he was streamed by the triage nurse to the minor injuies team as this was seen at a lower back MSK presentation. However, his NEWs was found to be 4 due to elevated temperature, elevated respiration rate and tachycardia. With this in mind, he was moved to majors. Fortunately the reviewing medic was switched on and persuaded radiology to do an MRI of the lumbar spine, which revealed an epidural abcess in the lumbar spine. This was initially managed using IV antibiotics before surgical decompression of the corda equina and drianage of the abcess.
The underlying cause? Staphylococcus aureus infection from a number of blackthorn scratches on the moors that had led to the infective arthritis of the knee, which had subsequently migrated to the spine.
He recovered well, although will always be left with a foot drop and some bladder urgency due to nerve damage.
Learning points
- Could this have been spotted earlier? The only significant points of note was the previous septic arthritis, and the occasional fevers. Most of us sensibly hear hooves and think horses. It would take a switched on practitioner to spot this one and even then, they would need the patient to persuade a busy emergency department to make an imaging request.
- The practitioner made the correct choice to not continue treatment rather than just carry on. In my opinion, if the treatment is nt providing benefit or improvement, you need to reflect and reconsider the presentation. It may be the patient continuing to do something provocative or it could be you’ve missed something.
- A full and thorough history is vital, and should be reviewed. The clue that of underlying infection was present was in the inconsistent fevers.
- Blackthorn scratches in many locations do cause infection, but most often present with cellulitis or local septic arthritis, it is extraordinarily rare to move through the bloodstream like this.
- This is unusual but we still need to hold a diagnostic seive in mind when considering presentations: VITAMIN C DEF is one but there are many others: Vascular, Infective, Trauma, Autoimmune, Metabolic, Iatrogenic, Neoplastic, Congenital, Degenerative, Endocrine, Functional. Some can be immediately rejected but at least they have been considered.
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