Orthopedic Surgery Basics US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Orthopedic Surgery Basics. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Orthopedic Surgery Basics US Medical PG Question 1: A 36-year-old male is taken to the emergency room after jumping from a building. Bilateral fractures to the femur were stabilized at the scene by emergency medical technicians. The patient is lucid upon questioning and his vitals are stable. Pain only at his hips was elicited. Cervical exam was not performed. What is the best imaging study for this patient?
- A. AP and lateral radiographs of hips
- B. Lateral radiograph (x-ray) of hips
- C. Magnetic resonance imaging (MRI) of hips, knees, lumbar, and cervical area
- D. Anterior-posterior (AP) and lateral radiographs of hips, knees, lumbar, and cervical area
- E. Computed tomography (CT) scan of cervical spine, hips, and lumbar area (Correct Answer)
Orthopedic Surgery Basics Explanation: ***Computed tomography (CT) scan of cervical spine, hips, and lumbar area***
- In **high-energy trauma** (fall from height), a CT scan is the **gold standard** for evaluating the **spine and pelvis**, providing detailed cross-sectional images superior to plain radiographs.
- Since the **cervical exam was not performed**, cervical spine imaging is **mandatory** per ATLS (Advanced Trauma Life Support) protocols. High-energy falls carry significant risk of **cervical spine injury** even without obvious neurological symptoms.
- CT allows comprehensive assessment of **hip fractures, pelvic injuries, and the entire spine** (cervical, thoracic, lumbar), identifying both obvious and **subtle fractures** that may be missed on plain films.
- This approach provides the most **efficient and thorough evaluation** in the acute trauma setting, allowing for appropriate surgical planning and ruling out life-threatening spinal instability.
*AP and lateral radiographs of hips*
- Plain radiographs provide **limited detail** and may **miss subtle fractures**, particularly in complex areas like the pelvis and acetabulum.
- This option **fails to address cervical spine clearance**, which is essential in all high-energy trauma patients, especially when cervical exam has not been performed.
- Radiographs are insufficient for **comprehensive trauma evaluation** after a fall from height.
*Lateral radiograph (x-ray) of hips*
- A single lateral view is **grossly insufficient** for evaluating hip and pelvic fractures, providing only a **two-dimensional perspective** that can miss significant injuries.
- This option **completely neglects spinal evaluation**, which is dangerous in an uncleared trauma patient with a high-energy mechanism.
*Magnetic resonance imaging (MRI) of hips, knees, lumbar, and cervical area*
- While MRI excels at evaluating **soft tissues, ligaments, and bone marrow**, it is **not the initial imaging modality** for acute bony trauma due to longer scan times and lower sensitivity for acute fractures compared to CT.
- MRI is **time-consuming and impractical** in the emergency setting for initial fracture assessment, potentially delaying definitive treatment.
- CT is superior for evaluating **acute skeletal injuries** in the trauma bay.
*Anterior-posterior (AP) and lateral radiographs of hips, knees, lumbar, and cervical area*
- Multiple plain radiographs have **limited sensitivity** for complex or non-displaced fractures, particularly in the **spine and pelvis**, making them inadequate for high-energy trauma evaluation.
- Obtaining multiple radiographic views requires **numerous patient repositionings**, which risks further injury if **spinal instability** is present.
- Plain films provide significantly **less diagnostic information** than CT scanning for trauma assessment.
Orthopedic Surgery Basics US Medical PG Question 2: Following a motor vehicle accident, a 63-year-old man is scheduled for surgery. The emergency physician notes a posture abnormality in the distal left lower limb and a fracture-dislocation of the right hip and acetabulum based on the radiology report. The senior orthopedic resident mistakenly notes a fracture dislocation of the left hip. The surgeon's examination of the patient in the operating room shows an externally rotated and shortened left lower limb. The surgeon reduces the left hip and inserts a pin in the left tibia. A review of postoperative imaging leads to a second surgery on the fracture-dislocation of the right hip. Which of the following strategies is most likely to prevent the recurrence of this type of error?
- A. Marking the surgical site
- B. Implementing a checklist
- C. Conducting a preoperative time-out (Correct Answer)
- D. Verifying the patient’s identity
- E. Performing screening X-rays
Orthopedic Surgery Basics Explanation: ***Conducting a preoperative time-out***
- A **preoperative time-out** is a crucial step in the Universal Protocol, ensuring that the entire surgical team confirms the correct patient, correct site, and correct procedure immediately before incision. This would have caught the discrepancy between the planned surgery and the surgeon's actions.
- The surgical time-out provides a final opportunity for all team members to voice concerns or identify errors, preventing wrong-site surgery as occurred here.
*Marking the surgical site*
- While **surgical site marking** is part of the Universal Protocol, it primarily prevents wrong-side or wrong-level surgery when multiple potential sites exist or when laterality is critical.
- In this scenario, the issue was a misidentification of the *injured* hip at the point of action, not necessarily an ambiguity on which limb *to mark*. The surgeon operated on the palpably injured hip, but it was the wrong one according to the actual diagnosis.
*Implementing a checklist*
- Implementing a comprehensive **surgical safety checklist** can reduce errors across many domains, but its effectiveness depends on strict adherence and a culture of safety.
- While valuable, a checklist alone might not have prevented this specific error if the initial misinterpretation of the radiology report by the resident wasn't explicitly cross-checked at a critical "stop" point.
*Verifying the patient’s identity*
- **Verifying patient identity** is a fundamental safety measure at multiple points, including admission, consent, and before surgery, but it prevents operating on the wrong patient.
- In this case, the correct patient was identified; the error was related to the specific surgical site on that patient.
*Performing screening X-rays*
- **Screening X-rays** are typically performed to assess the extent of injury and confirm the diagnosis before surgery. This was done, and the radiology report correctly identified the right hip injury.
- The error arose from the *interpretation* and *communication* of these findings, not the absence of imaging itself. The existing radiology report, if properly reviewed and confirmed, would have prevented the error.
Orthopedic Surgery Basics US Medical PG Question 3: A 47-year-old woman comes to the physician because of body aches for the past 9 months. She also has stiffness of the shoulders and knees that is worse in the morning and tingling in the upper extremities. Examination shows marked tenderness over the posterior neck, bilateral mid trapezius, and medial aspect of the left knee. A complete blood count and erythrocyte sedimentation rate are within the reference ranges. Which of the following is the most likely diagnosis?
- A. Systemic lupus erythematosus
- B. Fibromyalgia (Correct Answer)
- C. Rheumatoid arthritis
- D. Polymyositis
- E. Major depressive disorder
Orthopedic Surgery Basics Explanation: ***Fibromyalgia***
- The patient's presentation of widespread **body aches for 9 months**, morning **stiffness**, and **multiple tender points** (posterior neck, bilateral mid trapezius, medial aspect of the knee) in the absence of inflammatory markers (normal ESR, normal CBC) is highly characteristic of **fibromyalgia**.
- **Paresthesias** (tingling in the upper extremities) are a common associated feature in fibromyalgia.
- Fibromyalgia is a chronic pain syndrome diagnosed clinically based on widespread pain and tender points, with normal laboratory findings.
*Systemic lupus erythematosus*
- SLE typically presents with **systemic inflammation**, often involving joints, skin, and kidneys, along with abnormalities in inflammatory markers (e.g., elevated ESR, positive ANA, cytopenias).
- The widespread tender points and completely normal inflammatory markers make SLE very unlikely.
*Rheumatoid arthritis*
- RA primarily affects the **synovial joints** symmetrically, leading to joint swelling, warmth, and morning stiffness, typically accompanied by elevated ESR and CRP.
- The examination findings show specific **tender points** rather than objective joint swelling, and the normal ESR rules against active RA.
*Polymyositis*
- Polymyositis is characterized by **proximal muscle weakness** (not diffuse body aches) and is associated with elevated muscle enzymes (CK, aldolase) and inflammatory changes on muscle biopsy.
- This patient has pain and tenderness without weakness, and her laboratory tests are normal.
*Major depressive disorder*
- While **fatigue**, body aches, and sleep disturbances can be symptoms of major depressive disorder, the presence of specific, well-defined **tender points on examination** points towards a primary pain syndrome.
- Fibromyalgia often coexists with depression, but the objective physical findings of multiple tender points are more consistent with fibromyalgia as the primary diagnosis.
Orthopedic Surgery Basics US Medical PG Question 4: A 33-year-old man presents to his primary care physician with shoulder pain. He states that he can't remember a specific instance when the injury occurred. He is a weight lifter and competes in martial arts. The patient has no past medical history and is currently taking a multivitamin. Physical exam demonstrates pain with abduction of the patient's right shoulder and with external rotation of the right arm. There is subacromial tenderness with palpation. His left arm demonstrates 10/10 strength with abduction as compared to 4/10 strength with abduction of the right arm. Which of the following best confirms the underlying diagnosis?
- A. Ultrasound
- B. Radiography
- C. MRI (Correct Answer)
- D. CT
- E. Physical exam and history
Orthopedic Surgery Basics Explanation: ***MRI***
- An **MRI is the gold standard** for diagnosing soft tissue injuries of the shoulder, including **rotator cuff pathology**, which is highly suspected given the patient's symptoms (pain with abduction and external rotation, subacromial tenderness, and weakness).
- It provides detailed imaging of tendons, ligaments, and cartilage, allowing for precise identification of **tears, inflammation, or impingement**.
*Ultrasound*
- While ultrasound can assess **rotator cuff integrity** and identify fluid collections, it is highly operator-dependent and may not provide the same level of detail as MRI for complex tears or associated pathologies.
- It can be a good initial screening tool but might **underestimate the extent** of an injury compared to MRI.
*Radiography*
- **Radiography (X-rays)** primarily visualizes bone structures and would be useful for detecting fractures, dislocations, or significant degenerative joint disease.
- It would **not directly visualize** the soft tissue injuries of the rotator cuff or other tendons that are likely causing this patient's symptoms.
*CT*
- **CT scans** provide excellent detail of bone structures and can identify subtle fractures, erosions, or bony impingement.
- However, like X-rays, they are **less effective for visualizing soft tissues** like tendons and ligaments compared to MRI.
*Physical exam and history*
- The **physical exam and history** are crucial for narrowing down the differential diagnosis and guiding further imaging.
- While strongly suggestive of a rotator cuff injury, they alone **cannot definitively confirm the extent or nature** of the underlying soft tissue pathology.
Orthopedic Surgery Basics US Medical PG Question 5: A patient presents to the emergency department with arm pain. The patient recently experienced an open fracture of his radius when he fell from a ladder while cleaning his house. Surgical reduction took place and the patient's forearm was put in a cast. Since then, the patient has experienced worsening pain in his arm. The patient has a past medical history of hypertension and asthma. His current medications include albuterol, fluticasone, loratadine, and lisinopril. His temperature is 99.5°F (37.5°C), blood pressure is 150/95 mmHg, pulse is 90/min, respirations are 19/min, and oxygen saturation is 99% on room air. The patient's cast is removed. On physical exam, the patient's left arm is tender to palpation. Passive motion of the patient's wrist and fingers elicits severe pain. The patient's left radial and ulnar pulse are both palpable and regular. The forearm is soft and does not demonstrate any bruising but is tender to palpation. Which of the following is the next best step in management?
- A. Replace the cast with a sling
- B. Measurement of compartment pressure (Correct Answer)
- C. Ibuprofen and reassurance
- D. Emergency fasciotomy
- E. Radiography
Orthopedic Surgery Basics Explanation: ***Measurement of compartment pressure***
- The patient exhibits classic signs of **compartment syndrome**, including severe pain out of proportion to injury, pain with passive stretching, and a history of trauma followed by casting. Measuring compartment pressure is crucial for diagnosis despite palpable pulses.
- Early measurement of compartment pressures can confirm the diagnosis and guide the decision for an **emergency fasciotomy** to prevent irreversible tissue damage.
*Replace the cast with a sling*
- This action would likely worsen the patient's condition by delaying the diagnosis and treatment of potential **compartment syndrome**.
- A sling does not address the underlying issue of increased pressure within the muscle compartments.
*Ibuprofen and reassurance*
- Administering **Ibuprofen (NSAID)** might mask the pain but will not resolve the increased pressure within the compartment, which is a surgical emergency.
- Reassurance without proper assessment of compartment syndrome could lead to irreversible muscle and nerve damage.
*Emergency fasciotomy*
- While a fasciotomy is the definitive treatment for confirmed compartment syndrome, it should only be performed **after compartment pressures have been measured** and the diagnosis confirmed, unless the clinical suspicion is extremely high and pressures cannot be obtained.
- Performing a fasciotomy without objective confirmation is generally not the immediate next step, as it is an invasive procedure with its own risks.
*Radiography*
- **Radiography** would be useful to assess the healing of the fracture or rule out new fractures, but it will not provide information about the soft tissue pressure changes characteristic of compartment syndrome.
- The patient's symptoms are more indicative of a circulatory or soft tissue issue rather than a new bony problem.
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