Orthopaedics & MSK

Orthopaedics & MSK UK Medical PG Question 1: A 52-year-old diabetic man presents with a non-healing foot ulcer. ABPI is 0.4. What is the most appropriate management?

• A. Antibiotics alone
• B. Wound care only
• C. Vascular surgery referral (Correct Answer)
• D. Amputation
• E. Hyperbaric oxygen

Orthopaedics & MSK Explanation: ***Vascular surgery referral***- An **ABPI of 0.4** signifies **severe peripheral arterial disease (PAD)**, often corresponding to **critical limb ischemia (CLI)**, which requires urgent specialist evaluation for revascularization.- The primary objective is to restore adequate blood flow (perfusion) via procedures like **angioplasty** or **bypass surgery** to enable ulcer healing and prevent major limb loss.*Antibiotics alone*- While infection management is crucial, **antibiotics** cannot correct the underlying **ischemia** caused by the severe arterial blockage (ABPI 0.4).- Without improved blood flow, systemic or topical antibiotics will fail to reach effective concentrations in the poorly perfused tissue, rendering the treatment ineffective for healing.*Wound care only*- Basic **wound care** (dressing, debridement) is necessary but will be ineffective as the sole treatment because healing requires sufficient **oxygen and nutrients**, which are severely compromised at this low ABPI.- Focusing purely on local care without addressing the severe **macrovascular disease** will almost guarantee progression to **necrosis** and subsequent amputation.*Amputation*- **Amputation** is a procedure of necessity, usually reserved for cases where revascularization has failed or when there is overwhelming infection or non-salvageable tissue destruction (wet gangrene).- The patient must first be assessed for potential limb salvage through **revascularization** before proceeding directly to amputation.*Hyperbaric oxygen*- **Hyperbaric oxygen therapy (HBOT)** is an adjunctive treatment that may aid wound healing by increasing tissue oxygenation, but it is not the definitive treatment for structural arterial occlusion.- HBOT is typically applied after **revascularization** has been attempted but is insufficient as the primary management for severe PAD (ABPI 0.4).

Orthopaedics & MSK UK Medical PG Question 2: A 29-year-old man presents with acute onset severe lower back pain and bilateral leg weakness after heavy lifting. He has saddle anesthesia and urinary retention. MRI shows central disc herniation at L4-L5. What is the expected outcome with prompt treatment?

• A. Complete recovery in all cases
• B. Good functional recovery in most cases
• C. Variable outcome depending on delay (Correct Answer)
• D. Poor prognosis regardless of treatment
• E. Recovery limited to bladder function

Orthopaedics & MSK Explanation: ***Variable outcome depending on delay***- Cauda Equina Syndrome (CES) is a neurological emergency where prognosis, especially for **bladder** and **bowel function**, is highly dependent on the **time to surgical decompression**.- Delays in treatment, typically beyond 24-48 hours, significantly increase the risk of **permanent neurological deficits**, making the outcome highly unpredictable and variable.*Complete recovery in all cases*- Even with prompt surgical intervention, severe or prolonged compression often leads to some **residual neurological deficit**, particularly affecting **bladder, bowel, and sexual function**.- While early treatment improves outcomes, **complete recovery** in all aspects is not guaranteed due to the vulnerability of the cauda equina nerve roots to ischemic damage.*Good functional recovery in most cases*- The likelihood of **good functional recovery**, especially regarding **sphincter control**, is critically dependent on the timing of intervention and the severity of pre-operative deficits.- Many patients, particularly if surgery is delayed, experience long-term defects, making "good functional recovery in most cases" an overly optimistic assessment.*Poor prognosis regardless of treatment*- Prompt surgical decompression is crucial and significantly improves motor and sensory outcomes, offering the best chance for recovery of **sphincter function** and overall neurological improvement.- The prognosis for CES is highly dependent on the timeliness of treatment, meaning a poor prognosis is not inevitable if intervention is swift.*Recovery limited to bladder function*- Cauda Equina Syndrome (CES) affects multiple neurological functions, including **motor function** (leg weakness), **sensory function** (saddle anesthesia), and **autonomic function** (bladder and bowel control).- When recovery occurs, it typically involves improvements across motor, sensory, and autonomic domains, not exclusively bladder function, although bladder and bowel function are often the slowest and most challenging to recover fully.

Orthopaedics & MSK UK Medical PG Question 3: A 45-year-old man presents with acute severe lower back pain and leg weakness. MRI shows large central disc herniation with cauda equina compression. What is the surgical urgency?

• A. Elective (weeks)
• B. Urgent (days)
• C. Emergency (hours) (Correct Answer)
• D. No surgery needed
• E. Depends on symptoms

Orthopaedics & MSK Explanation: ***Emergency (hours)***- **Cauda Equina Syndrome (CES)** caused by acute central disc herniation requires immediate surgical decompression, ideally within **6 to 24 hours**, to maximize the chances of recovering full **neurological function**.- Delaying intervention significantly increases the risk of permanent disabling deficits, particularly **bladder and bowel incontinence** and **irreversible muscle weakness**.*Elective (weeks)*- Elective scheduling is appropriate only for stable conditions or those where chronic pain management is the primary goal, not for acute **nerve root compression syndromes**.- Delaying care by weeks in a confirmed CES case guarantees a poor prognosis regarding **sphincter and motor function**.*Urgent (days)*- While CES is highly urgent, characterizing it over *days* risks missing the critical window for decompression; the condition deteriorates rapidly.- Intervention for CES must be initiated immediately upon diagnosis (within **hours**), differentiating it from conditions that can safely wait 24–72 hours.*No surgery needed*- A mass lesion (large central disc herniation) causing acute **cauda equina compression** will not resolve adequately through conservative management alone.- Surgery is necessary to mechanically relieve the pressure on the nerve roots and prevent **permanent paralysis and sensory loss**.*Depends on symptoms*- The provided clinical presentation (acute severe low back pain and **leg weakness**) already suggests significant neurological compromise.- The combination of symptoms and the confirmed **cauda equina compression** on MRI elevates this to a non-negotiable surgical emergency, regardless of the precise degree of **sphincter dysfunction** at presentation.

Orthopaedics & MSK UK Medical PG Question 4: A 24-year-old man presents with acute onset severe lower back pain and bilateral leg weakness. He has urinary retention and saddle anesthesia. What is the time frame for surgical intervention?

• A. Within 6 hours
• B. Within 24-48 hours (Correct Answer)
• C. Within 1 week
• D. Within 1 month
• E. No time limit

Orthopaedics & MSK Explanation: ***Within 24–48 hours*** - This clinical presentation (severe low back pain, bilateral weakness, urinary retention, and **saddle anesthesia**) defines **Cauda Equina Syndrome (CES)**, a true neurosurgical emergency. - Urgent **surgical decompression** performed within the **24–48 hour** window is critical to maximize the likelihood of recovery, especially of fragile **bladder and bowel function**. *Within 6 hours* - While immediate intervention is ideal and preferred, **6 hours** is often an unfeasible or highly strict cutoff given the variability in symptom presentation and necessary preparatory steps (MRI, planning). - The key critical window recognized for achieving maximal recovery after diagnosis of **CES** spans up to 48 hours. *Within 1 week* - Delaying surgical decompression past the 48-hour mark dramatically increases the risk of **irreversible neurological injury**, particularly to the **sacral roots** controlling continence. - This timeframe is too slow for an acute compressive syndrome that leads to potential permanent **paralysis** and disability. *Within 1 month* - A delay of one month ensures **permanent neurological deficits**, including irreversible loss of motor function and **bladder/bowel control**. - This time frame is irrelevant to the management of an acute, progressive **cauda equina compression**. *No time limit* - **Cauda Equina Syndrome** is an urgent condition where prolonged compression results in direct **ischemic injury** and necrosis of the spinal nerve roots. - Lack of timely decompression guarantees poor long-term outcome and **permanent functional disability**, thus a time limit is essential.

Orthopaedics & MSK UK Medical PG Question 5: A 72-year-old man presents with confusion and agitation 3 days after hip surgery. He sees people who aren't there and is disoriented to time and place. What is the most likely diagnosis?

• A. Dementia
• B. Postoperative delirium (Correct Answer)
• C. Alcohol withdrawal
• D. Depression
• E. Anxiety

Orthopaedics & MSK Explanation: ***Postoperative delirium*** - This diagnosis perfectly fits the clinical picture: an acute onset of confusion, agitation, and **visual hallucinations** (seeing people who aren't there) in an elderly patient following a major stressor like hip surgery. - Delirium is an **acute, fluctuating disturbance** of attention and cognition, and advanced age combined with recent surgery is the most common risk factor for the postoperative subtype.*Dementia* - Dementia is characterized by a **chronic, progressive decline** in memory and other cognitive domains, which is inconsistent with the acute change observed over 3 days. - While individuals with pre-existing dementia are at high risk for delirium, the acute change itself is defined as **superimposed delirium**, not just dementia.*Alcohol withdrawal* - This diagnosis (especially **delirium tremens**) can cause agitation and prominent visual or tactile hallucinations, but it requires a history of **heavy chronic alcohol use** which is not specified. - Symptoms typically peak 48–96 hours after cessation, and while the timing is plausible, the recent major surgery provides a more direct and common cause for the observed presentation in the absence of a known history of substance abuse.*Depression* - Depression presents with mood disturbances, anhedonia, and vegetative symptoms, but it does **not cause acute, global disorientation** or **frank visual hallucinations**. - Although severe depression can cause cognitive slowing (**pseudodementia**), it lacks the acute-onset, hyperactive agitated state frequently seen in delirium.*Anxiety* - Anxiety is characterized by excessive worry, tension, and autonomic symptoms, but it does **not cause acute disorientation** to time and place or complex **visual hallucinations**. - The patient's confusion and disorientation indicate a global disturbance of cortical function, which is not characteristic of primary anxiety disorders.

Orthopaedics & MSK Flashcard 1 of 5

Question: High-energy trauma patient with severe back pain & spinal misalignment = _____

Answer: fracture-dislocation fracture; unstable with high neurological risk

Orthopaedics & MSK Flashcard 2 of 5

Question: Garden classification III & IV for means the blood supply is disrupted to the femoral neck resulting in _____

Answer: avascular necrosis

Orthopaedics & MSK Flashcard 3 of 5

Question: What is the management of a Colles / Smith's fracture with neurovascular comprimise? Immediate _____ If it persists → CT & refer to orthopaedic surgery for an ORIF

Answer: closed reduction

Orthopaedics & MSK Flashcard 4 of 5

Question: What is a late sign in Cauda Equina Syndrome _____

Answer: Urinary Incontinence

Orthopaedics & MSK Flashcard 5 of 5

Question: There is a positive _____ in Otosclerosis

Answer: family history