Spine Disorders Practice Questions

Q: A 36-year-old man developed neck and left arm pain. He noted paresthesias in the left index and long fingers. He was found to have weakness of the left triceps muscle and a diminished left triceps jerk. His left-sided disc herniation is most likely to be at what level?

C6-C7. **Explanation:** The clinical presentation describes a **C7 radiculopathy**, which is most commonly caused by a posterolateral disc herniation at the **C6-C7 level**. In the cervical spine, the nerve root exits *above* the pedicle of the corresponding vertebra (e.g., the C7 nerve root exits through the C6-C7 intervertebral foramen). **Why C6-C7 is correct:** The C7 nerve root is responsible for: * **Motor:** Extension of the elbow (Triceps muscle) and wrist flexion. * **Reflex:** The Triceps jerk. * **Sensory:** Sensation to the middle finger (long finger) and often the index finger. The patient’s symptoms—triceps weakness, diminished triceps reflex, and paresthesia in the index/long fingers—perfectly align with C7 involvement. **Why other options are incorrect:** * **C3-C4 (C4 root):** Results in sensory loss at the base of the neck and top of the shoulder; no major limb muscle weakness or reflex changes. * **C4-C5 (C5 root):** Causes weakness in the Deltoid and Biceps, sensory loss over the lateral arm, and a diminished Biceps reflex. * **C5-C6 (C6 root):** Causes weakness in the Biceps and Brachioradialis (wrist extensors), sensory loss in the thumb and radial side of the forearm, and a diminished Brachioradialis reflex. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Level:** C6-C7 (C7 root) is the most frequent site of cervical disc herniation, followed by C5-C6 (C6 root). * **The "Rule of Fingers":** * C6 = Thumb ("6" looks like a 'b' for Biceps/Brachioradialis). * C7 = Middle finger (The "7" looks like a pointing finger). * C8 = Ring and Little fingers. * **Spurling’s Test:** A high-yield physical exam maneuver where neck extension and lateral rotation toward the affected side reproduce radicular pain.

Q: Which is the commonest level involved in lower cervical spine injury?

C5-C6. **Explanation:** The cervical spine is divided into the upper cervical (C1-C2) and lower cervical (C3-C7) segments. In the lower cervical spine, the **C5-C6 level** is the most frequently injured site. **Why C5-C6 is the Correct Answer:** The primary reason for the high incidence of injury at this level is **maximal mobility**. The C5-C6 junction represents the point of greatest flexion and extension in the cervical spine. In traumatic events like "whiplash" or high-velocity motor vehicle accidents, the mechanical stress and kinetic energy are concentrated at this fulcrum, making it highly susceptible to subluxation, dislocation, and fractures. **Analysis of Incorrect Options:** * **C3-C4 & C4-C5:** While these levels are part of the mobile subaxial spine, they are located higher up and undergo less mechanical strain compared to the C5-C6 segment. * **C6-C7:** This is the second most common site of injury. It serves as the transition zone between the mobile cervical spine and the relatively rigid thoracic spine (cervicothoracic junction), but statistically, it trails behind C5-C6 in frequency. **High-Yield Clinical Pearls for NEET-PG:** * **Most common level of Cervical Disc Herniation:** C5-C6 (affecting the C6 nerve root). * **Most common level of Spondylosis:** C5-C6, followed by C6-C7. * **Neurological Correlation:** Injury at C5-C6 often results in **C6 radiculopathy**, presenting with weakness in wrist extensors and sensory loss over the thumb and radial aspect of the forearm. * **Clay Shoveler’s Fracture:** An avulsion fracture of the spinous process, most commonly seen at **C7** (due to heavy lifting/shearing forces).

Q: In adults, cervical instability most commonly results from what?

Degenerative disc disease. **Explanation:** In adults, **Degenerative Disc Disease (DDD)** is the most common cause of cervical instability. As the intervertebral discs age, they lose water content and height (desiccation), leading to a loss of the disc’s structural integrity. This collapse results in **segmental hypermobility** and laxity of the surrounding ligaments (like the ligamentum flavum and posterior longitudinal ligament). Over time, this instability triggers the formation of osteophytes (spondylosis) as the body attempts to restabilize the segment, often leading to cervical spondylotic myelopathy or radiculopathy. **Analysis of Incorrect Options:** * **A & B (Rotational and Flexion-Extension Injuries):** While these are common mechanisms for *acute* traumatic instability (e.g., whiplash or fractures), they are less frequent causes of instability in the general adult population compared to the near-universal prevalence of age-related degeneration. * **D (Increased Ligamentous Laxity):** While ligamentous laxity causes instability, it is typically associated with specific systemic conditions like **Rheumatoid Arthritis** (specifically causing Atlanto-axial subluxation) or Down Syndrome, rather than being the primary cause in the general adult population. **Clinical Pearls for NEET-PG:** * **Most common level of cervical disc degeneration:** C5-C6, followed by C6-C7. * **Radiological Hallmark:** The "Vacuum Phenomenon" (gas within the disc space) is a specific sign of disc degeneration. * **Instability Definition:** On lateral flexion-extension X-rays, instability is defined as >3.5 mm translation or >11° angulation between adjacent vertebrae. * **Rheumatoid Arthritis:** Always rule out atlanto-axial instability before intubation in these patients due to transverse ligament laxity.

Q: What is the most common area involved in spinal tuberculosis?

Para-discal area. **Explanation:** Spinal Tuberculosis (Pott’s Spine) is the most common form of skeletal tuberculosis. The infection is typically secondary to a primary focus (usually lungs) and spreads via the **Batson’s venous plexus** or arterial routes. **1. Why Para-discal is the Correct Answer:** The **Para-discal type** is the most common variety (approx. 50-80% of cases). The infection starts in the subchondral bone of the vertebral body adjacent to the intervertebral disc. Because the intraosseous arteries bifurcate and supply two adjacent vertebrae, the infection easily crosses the disc space to involve the neighboring vertebra. This leads to the characteristic destruction of the disc and narrowing of the disc space seen on X-rays. **2. Analysis of Incorrect Options:** * **Central type:** The infection starts in the center of the vertebral body. It often leads to early collapse and "vertebra plana," but it is less common than the para-discal type. * **Anterior involvement:** Also known as the "sub-periosteal" type, the infection spreads under the anterior longitudinal ligament. It is more common in children but less frequent overall. * **Appendiceal involvement:** This refers to the involvement of posterior elements (pedicle, lamina, spines). It is rare (approx. 2-5%) but clinically significant as it often leads to early neurological deficits due to spinal canal encroachment. **Clinical Pearls for NEET-PG:** * **Most common site:** Lower Thoracic and Upper Lumbar vertebrae (Thoracolumbar junction). * **Earliest sign on X-ray:** Rarefaction/blurring of the vertebral endplates and narrowing of the disc space. * **Deformity:** Destruction of the anterior part of the vertebrae leads to **Kyphosis** (Gibbus deformity). * **Cold Abscess:** A hallmark of Pott's spine; it is "cold" because it lacks the typical signs of acute inflammation (heat, redness).

Q: What is the most reliable diagnostic test for spinal tuberculosis?

CT-guided biopsy. **Explanation:** Spinal tuberculosis (Pott’s disease) remains a significant cause of morbidity. The diagnosis is established through a combination of clinical, radiological, and microbiological findings. **Why CT-guided biopsy is the correct answer:** While imaging can suggest tuberculosis, the **gold standard** and most reliable diagnostic test is a **CT-guided needle biopsy**. It allows for histopathological examination (revealing caseating granulomas) and microbiological confirmation (Acid-Fast Bacilli staining or GeneXpert/CBNAAT). CT guidance ensures precision in reaching the deep-seated vertebral lesions or paravertebral abscesses while minimizing the risk of injury to the spinal cord or major vessels. **Analysis of incorrect options:** * **ESR (Option A):** This is a non-specific marker of inflammation. While it is usually elevated in Pott’s disease and useful for monitoring treatment response, it cannot confirm the diagnosis. * **PPD Skin Test (Option B):** A positive Mantoux test indicates prior exposure to *M. tuberculosis* but does not differentiate between latent infection and active spinal disease. It has low specificity in endemic regions like India. * **MRI (Option C):** MRI is the **investigation of choice (most sensitive imaging)** for early detection, assessing marrow edema, and evaluating cord compression. However, it provides radiological suspicion rather than definitive pathological proof. **NEET-PG High-Yield Pearls:** * **Most common site:** Lower thoracic and upper lumbar vertebrae. * **Earliest radiological sign:** Paradoxical expansion of the disc space (rare) or narrowing of the disc space (common). * **Cold Abscess:** Characterized by the absence of classic signs of inflammation (heat/redness). * **Gibbus Deformity:** Results from anterior wedging and collapse of the vertebral bodies.

Q: What is the full form of SCIWORA?

Spinal cord injury without radiographic abnormality. **Explanation:** **SCIWORA** stands for **Spinal Cord Injury Without Radiographic Abnormality**. 1. **Underlying Medical Concept:** This condition occurs when a patient presents with clinical signs of post-traumatic myelopathy (neurological deficits like paralysis or sensory loss), but conventional imaging—specifically **Plain X-rays and CT scans**—shows no evidence of fracture or dislocation. It is most commonly seen in the **pediatric population** (especially children <8 years) because their spinal columns are more elastic than the spinal cord itself. The vertebral column can stretch or momentarily displace and recoil, leaving the cord injured by traction or ischemia without leaving a bony "footprint" on a radiograph. 2. **Analysis of Options:** * **Option D is correct** as it uses the standard medical terminology. * **Options A and B** are incorrect because the defining feature of this syndrome is the *absence* of findings on standard imaging. * **Option C** is incorrect because "aberration" is not the standard clinical term used in this classification; "abnormality" is the universally accepted nomenclature. 3. **High-Yield Facts for NEET-PG:** * **Gold Standard Investigation:** While X-rays/CT are normal, **MRI** is the investigation of choice as it can detect intramedullary edema, hemorrhage, or ligamentous injury. * **Most Common Site:** The **Cervical spine** is the most frequently involved region. * **Mechanism:** Increased ligamentous laxity and shallow facet joints in children allow for transient subluxation. * **Prognosis:** Depends on the MRI findings; complete cord transection seen on MRI carries a poor prognosis, whereas normal MRI findings with clinical deficits have a better recovery rate.

Q: Scheuermann's disease occurs in which age group?

Adolescents. **Explanation:** **Scheuermann’s Disease** (Juvenile Kyphosis) is a developmental disorder characterized by structural kyphosis of the thoracic or thoracolumbar spine. 1. **Why Adolescents is correct:** The disease typically manifests during the **pubertal growth spurt (ages 12–17)**. It occurs due to osteochondrosis of the secondary ossification centers of the vertebral bodies. The mechanical failure of the epiphyseal plates leads to wedge-shaped vertebrae, resulting in a fixed "hunchback" deformity. 2. **Why other options are incorrect:** * **Infants:** Spinal deformities in infants are usually congenital (e.g., hemivertebrae) rather than developmental osteochondrosis. * **Adults/Elderly:** While adults may present with the *sequelae* (chronic back pain or fixed deformity), the disease process itself initiates and progresses only during the skeletal growth phase of adolescence. Kyphosis in the elderly is more commonly due to osteoporotic compression fractures (Dowager’s hump). **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Criteria (Sorensen’s Criteria):** Diagnosis requires anterior wedging of **≥5° in at least three adjacent vertebrae**. * **Schmorl’s Nodes:** These are herniations of the nucleus pulposus into the vertebral endplates, a classic radiological finding in this condition. * **Clinical Sign:** Unlike postural kyphosis, Scheuermann’s is a **fixed deformity**; it does not disappear on spinal extension or the Adam’s forward bend test. * **Treatment:** Conservative management with bracing (Milwaukee brace) is indicated for curves between 50°–75° in skeletally immature patients. Surgery is reserved for curves >75°.

Q: What is the most common cause of secondary tumors affecting the spinal cord?

Secondaries from the lungs. **Explanation:** Spinal metastases are the most common tumors of the spine, and the vertebral column is the most frequent site for skeletal metastasis. **1. Why Lungs are the Correct Answer:** Statistically, **Lung cancer** is the most common primary source of spinal metastases in **men** and the most common cause overall when considering both genders in various global epidemiological studies. Lung cancer cells frequently spread via the arterial circulation, leading to rapid dissemination to the vertebral bodies. Because lung cancer has a high incidence and a high propensity for early systemic spread, it remains the leading cause of secondary spinal tumors. **2. Analysis of Incorrect Options:** * **Breast Cancer (Option B):** This is the most common cause of spinal secondaries in **women**. While extremely frequent, it ranks second to lung cancer when considering the total population. * **Prostate Cancer (Option C):** This is a very common cause in elderly men, typically presenting as **osteoblastic** (sclerotic) lesions. It spreads primarily via the Batson venous plexus. * **Gastrointestinal Tract (Option D):** GI malignancies (like colon or stomach cancer) can metastasize to the spine, but they do so much less frequently than lung, breast, or prostate cancers. **3. NEET-PG High-Yield Pearls:** * **Most common site of spinal metastasis:** Thoracic spine (70%), followed by the lumbar spine (20%). * **Most common location within the vertebra:** The **posterior aspect of the vertebral body** is the initial site, but the **pedicle** is the first part to show radiological changes (the "Winking Owl" sign on X-ray). * **Route of spread:** Most cancers spread via the **Batson venous plexus** (a valveless system connecting pelvic/thoracic veins to internal vertebral venous plexuses). * **Type of lesion:** Lung cancer usually causes **osteolytic** lesions, while Prostate cancer causes **osteoblastic** lesions.

Q: What is the next commonest site of intervertebral disc prolapse after L4-S1?

C6 - C7. **Explanation:** Intervertebral disc prolapse (IVDP) occurs most frequently in regions of the spine that exhibit the greatest mobility and bear significant mechanical stress. **1. Why C6-C7 is the correct answer:** The most common site for IVDP overall is the lumbar spine, specifically the **L4-L5 and L5-S1** levels, which bear the maximum weight of the body. Following the lumbar region, the **cervical spine** is the second most common area involved. Within the cervical spine, the **C6-C7** level is the most frequent site of herniation (affecting the C7 nerve root), followed by C5-C6. This is due to the high degree of transition and mobility at the cervicothoracic junction. **2. Why the other options are incorrect:** * **T12-L1:** The thoracic spine is the least common site for disc prolapse because the rib cage provides significant stability and limits excessive movement, protecting the discs from mechanical wear. * **L1-L2 and L2-L3:** While these are lumbar discs, herniations at these "high lumbar" levels are statistically much rarer than L4-S1. Disc prolapse frequency in the lumbar spine follows a descending order from distal to proximal (L5-S1 > L4-L5 > L3-L4 > L2-L3 > L1-L2). **Clinical Pearls for NEET-PG:** * **Most common level overall:** L4-L5 (followed closely by L5-S1). * **Most common cervical level:** C6-C7 (affects C7 root; presents with weak triceps and loss of triceps reflex). * **Schmorl’s Nodes:** Prolapse of the nucleus pulposus into the vertebral body (vertical prolapse). * **Posterolateral Prolapse:** The most common direction of herniation because the posterior longitudinal ligament is weakest at the sides.

Question 1

A 36-year-old man developed neck and left arm pain. He noted paresthesias in the left index and long fingers. He was found to have weakness of the left triceps muscle and a diminished left triceps jerk. His left-sided disc herniation is most likely to be at what level?

Accepted Answer

C6-C7

Answer

C3-C4

Answer

C4-C5

Answer

C5-C6

Question 2

Which is the commonest level involved in lower cervical spine injury?

Accepted Answer

C5-C6

Answer

C3-C4

Answer

C4-C5

Answer

C6-C7

Question 3

In adults, cervical instability most commonly results from what?

Accepted Answer

Degenerative disc disease

Answer

A rotational injury

Answer

A flexion-extension injury

Answer

Increased ligamentous laxity

Question 4

What is the most common area involved in spinal tuberculosis?

Accepted Answer

Para-discal area

Answer

Central type

Answer

Anterior involvement

Answer

Appendiceal involvement

Question 5

What is the most reliable diagnostic test for spinal tuberculosis?

Accepted Answer

CT-guided biopsy

Answer

Erythrocyte Sedimentation Rate (ESR)

Answer

Purified Protein Derivative (PPD) skin test

Answer

Magnetic Resonance Imaging (MRI)

Question 6

A patient presents in the emergency department with a cervical spine fracture. What is the first priority in management?

Accepted Answer

Immobilize the cervical spine

Answer

Locate the fracture by shifting the patient side to side

Answer

Obtain an X-ray of the spine

Answer

Clear the airway and intubate the patient

Question 7

What is the full form of SCIWORA?

Accepted Answer

Spinal cord injury without radiographic abnormality

Answer

Spinal cord injury with radiographic abnormality

Answer

Spinal cord injury with radiographic aberration

Answer

Spinal cord injury without radiographic aberration

Question 8

Scheuermann's disease occurs in which age group?

Accepted Answer

Adolescents

Answer

Adults

Answer

Elderly

Answer

Infants

Question 9

What is the most common cause of secondary tumors affecting the spinal cord?

Accepted Answer

Secondaries from the lungs

Answer

Secondaries from the prostate gland

Answer

Secondaries from the breasts

Answer

Secondaries from the gastrointestinal tract

Question 10

What is the next commonest site of intervertebral disc prolapse after L4-S1?

Accepted Answer

C6 - C7

Answer

T12 - L1

Answer

L1 - L2

Answer

L2 - L3

Spine Disorders — MCQs

Spine Disorders — MCQs

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