Spine Disorders Practice Questions

Q: Prolapsed intervertebral disc is most common at which spinal level?

L5-S1. ### Explanation **Correct Answer: D. L5-S1** **Why it is correct:** The lumbar spine is the most common site for Prolapsed Intervertebral Disc (PIVD) because it bears the maximum weight of the body and undergoes significant mechanical stress. Within the lumbar region, the **L4-L5** and **L5-S1** levels are the most frequently affected (accounting for approximately 95% of cases). The **L5-S1** level is particularly vulnerable because it is the "lumbosacral junction"—the point where the mobile lumbar spine meets the fixed sacrum. This transition zone experiences the highest shearing forces and rotational strain during movement. Additionally, the posterior longitudinal ligament (PLL) is narrower at these lower levels, providing less structural support against disc herniation. **Why the other options are incorrect:** * **A & B (C1-C2 and C2-C3):** Disc prolapse is extremely rare at these levels. In fact, there is **no intervertebral disc between C1 (Atlas) and C2 (Axis)**. Cervical disc prolapse most commonly occurs at C5-C6 and C6-C7 due to the high mobility of the lower neck. * **C (L2-L4):** While these are lumbar levels, they are less prone to herniation than the lower segments (L4-S1) because they bear relatively less weight and are further from the high-stress lumbosacral transition zone. **High-Yield Clinical Pearls for NEET-PG:** * **Most common level overall:** L4-L5 or L5-S1 (L4-L5 is often cited as slightly more common in some texts, but L5-S1 is the classic answer for the "most common site of stress"). * **Nerve Root Involvement:** A posterolateral disc prolapse usually compresses the **traversing nerve root** (e.g., L4-L5 disc affects the L5 nerve root). * **Schmorl’s Nodes:** These are vertical herniations of the nucleus pulposus through the vertebral endplate into the body of the vertebra. * **Gold Standard Investigation:** MRI is the investigation of choice for PIVD.

Q: A 44-year-old woman suffers a fall while rock climbing, landing on her buttocks and falling forward. Despite prolonged airlift to the ED, she is hemodynamically stable. She complains of bilateral pain in her legs, distal to her knees. She has profound weakness in her bilaterally extensor hallucis longi and gastrocsoleus complexes and has marked saddle anesthesia. MRI shows a large, midline herniated disc, compressing each of the traversing nerve roots and entire cauda equina below its level, but sparing the exiting nerve roots. Which disc is most likely involved in this injury?

L4-5. ### Explanation This patient presents with **Cauda Equina Syndrome (CES)**, a surgical emergency characterized by compression of multiple lumbosacral nerve roots. To identify the level of the disc herniation, we must correlate the clinical deficits with the anatomy of the spinal canal. **1. Why L4-5 is Correct:** * **Extensor Hallucis Longus (EHL):** Primarily supplied by the **L5** nerve root. * **Gastrocsoleus Complex:** Primarily supplied by the **S1** nerve root. * **Saddle Anesthesia:** Involvement of **S2-S4** roots. * **Anatomical Rule:** In the lumbar spine, a **paracentral/midline disc herniation** typically compresses the **traversing** nerve root (the one going to the level below). At the **L4-L5** level, the L4 root has already exited; the traversing roots are **L5, S1, and all subsequent sacral roots**. Compression here explains the loss of L5 (EHL), S1 (Gastrocsoleus), and S2-S4 (Saddle anesthesia) functions. **2. Why the others are Incorrect:** * **L2-3:** Compression here would involve L3 and below. While it would cause the symptoms described, it would *also* cause weakness in knee extension (Quadriceps - L4), which is not mentioned. * **L3-4:** This would involve L4 and below. It would typically present with a diminished patellar reflex and weak foot inversion/dorsiflexion (Tibialis Anterior - L4). * **L5-S1:** A midline herniation here would spare the L5 root (which has already exited). Therefore, the **EHL (L5) would be spared**, contradicting the clinical presentation. **Clinical Pearls for NEET-PG:** * **Most common level for CES:** L4-L5. * **Earliest sign of CES:** Urinary retention (high sensitivity). * **Surgical Window:** Decompression is ideally performed within **24–48 hours** to prevent permanent neurological deficit. * **Root Rule:** Lumbar discs affect the *lower* (traversing) root; Cervical discs affect the *same-level* (exiting) root.

Q: Schmorl's nodule is a radiographic finding seen in which of the following conditions?

Intervertebral disc prolapse. **Explanation:** **Schmorl’s nodules** represent a specific type of **intervertebral disc herniation** where the nucleus pulposus protrudes vertically through the cartilaginous and bony endplate into the body of the adjacent vertebra. While classic disc prolapse involves horizontal herniation (protrusion/extrusion) into the spinal canal or neural foramina, Schmorl’s nodules are essentially **intravertebral disc herniations**. **Why the other options are incorrect:** * **Spondylolisthesis:** Refers to the forward displacement of one vertebra over another, usually due to spondylolysis (pars interarticularis defect) or degenerative changes. * **Ankylosing spondylitis:** Characterized by "Bamboo spine" due to syndesmophytes, sacroiliitis, and squaring of vertebral bodies, rather than focal endplate herniations. * **Fracture of transverse process:** This is a traumatic bony injury usually resulting from direct impact or avulsion by the psoas muscle, unrelated to disc material migration. **High-Yield Clinical Pearls for NEET-PG:** * **Scheuermann’s Disease:** Multiple Schmorl’s nodules at consecutive levels, associated with thoracic kyphosis and anterior wedging of vertebrae in adolescents, is a classic exam favorite. * **Radiographic Appearance:** They appear as small, well-defined radiolucent indentations in the superior or inferior vertebral endplates, often with a sclerotic rim. * **Clinical Significance:** Most Schmorl’s nodules are asymptomatic and discovered incidentally; however, acute herniations can cause localized back pain. * **Common Site:** Most frequently seen in the thoracolumbar spine.

Q: What is the type of fracture shown?

Hangman's fracture. ***Hangman's fracture*** - Bilateral fractures of the **C2 pedicles** or **pars interarticularis** caused by severe **hyperextension** mechanism, typically seen in motor vehicle accidents or hanging injuries. - Radiologically shows characteristic **bilateral lucent lines** through C2 pedicles with possible **anteriolisthesis** of C2 on C3. *Jefferson fracture* - A **burst fracture of C1** (atlas) involving the anterior and posterior arches, typically from axial loading forces. - Shows **bilateral lateral mass displacement** on open-mouth odontoid view, not the bilateral C2 pedicle fractures seen here. *Clay Shoveler's fracture* - An **avulsion fracture** of the **spinous process** at **C6-T1** levels caused by sudden flexion against muscle contraction. - Appears as a **displaced spinous process fragment** on lateral view, completely different from the bilateral C2 pedicle involvement. *Jones fracture* - A fracture of the **5th metatarsal** at the metaphyseal-diaphyseal junction in the foot, unrelated to cervical spine pathology. - Occurs in the **foot** from inversion injury or repetitive stress, not involving any cervical vertebrae.

Q: A 10-year-old boy presents with scoliosis, a tuft of hair over the skin of the lumbar spine, and weakness with features of lower motor neuron paralysis in both lower limbs. An X-ray of the spine reveals fusion of the two lumbar vertebrae at that level. What is the most likely diagnosis?

Diastematomyelia. **Explanation:** The clinical presentation of a **tuft of hair (hypertrichosis)** over the lumbar spine, combined with **scoliosis** and **lower motor neuron (LMN) signs** in the lower limbs, is a classic triad for **Diastematomyelia**. **1. Why Diastematomyelia is correct:** Diastematomyelia is a form of spinal dysraphism where the spinal cord is longitudinally split into two halves by a fibrous, cartilaginous, or bony midline septum. This septum often "tethers" the cord. As the child grows, the vertebral column elongates faster than the spinal cord, causing traction injury. This leads to neurological deficits (LMN paralysis) and orthopedic deformities like scoliosis or clubfoot. Cutaneous markers (hair tufts, dimples, or lipomas) are present in over 50% of cases. **2. Why other options are incorrect:** * **Hemivertebra:** While a common cause of congenital scoliosis, it is a structural failure of vertebral formation and does not typically present with midline cutaneous hair tufts or primary LMN paralysis unless associated with other cord anomalies. * **Sacrococcygeal Teratoma:** This is a germ cell tumor presenting as a visible mass at the base of the coccyx, usually diagnosed in neonates. It does not cause a split cord or the specific neuro-orthopedic syndrome described. * **Spinal Muscular Atrophy (SMA):** This is a genetic degeneration of anterior horn cells. While it causes LMN weakness and scoliosis, it does not present with cutaneous markers (hair tufts) or vertebral fusion/septation. **Clinical Pearls for NEET-PG:** * **Imaging of Choice:** MRI is the gold standard to visualize the split cord. * **Associated Findings:** Often associated with **Tethered Cord Syndrome** and **Spina Bifida Occulta**. * **Key Sign:** The "tuft of hair" is the most common cutaneous sign of occult spinal dysraphism.

Q: Minerva jacket is used for which of the following conditions?

Cervical tuberculosis. **Explanation:** The **Minerva jacket** (or Minerva cast) is a specialized orthopedic brace or plaster cast designed to immobilize the **cervical and upper thoracic spine**. It provides stabilization by encompassing the chin and occiput (to prevent head movement) and extending down to the rib cage or waist. **1. Why Cervical Tuberculosis is Correct:** In cases of spinal tuberculosis (Pott’s disease) involving the cervical vertebrae, rigid immobilization is crucial to prevent neurological deficits (quadriplegia) and promote healing. The Minerva jacket effectively restricts flexion, extension, and rotation of the neck, making it the traditional choice for **cervical and cervicothoracic junction** lesions. **2. Why the Other Options are Incorrect:** * **Dorsolumbar Tuberculosis:** This region (T12-L1) is typically immobilized using a **Taylor’s Brace** or a **Body Jacket (Milwaukee brace is for scoliosis)**. The Minerva jacket does not provide enough leverage to stabilize the lower spine. * **Lumbar Tuberculosis:** Lower spinal lesions require a **Goldthwait brace** or a lumbosacral orthosis (LSO) to restrict lumbar motion. * **Sacral Tuberculosis:** This is rare and usually managed with bed rest or pelvic stabilization; a jacket extending to the head is anatomically unnecessary. **Clinical Pearls for NEET-PG:** * **Four-Poster Brace:** Another orthosis used for cervical spine stabilization, but less rigid than the Minerva jacket. * **Halo-Vest:** Provides the maximum degree of cervical immobilization (superior to Minerva). * **Taylor’s Brace:** High-yield for **Dorsolumbar** spine (contains two vertical posterior bars). * **Milwaukee Brace:** Specifically used for **Scoliosis** (apex above T8). * **Somi Brace:** (Sternal Occipital Mandibular Immobilizer) is used for cervical spine, often in bedridden patients.

Question 1

Prolapsed intervertebral disc is most common at which spinal level?

Accepted Answer

L5-S1

Answer

C1-C2

Answer

C2-C3

Answer

L2-L4

Question 2

A 44-year-old woman suffers a fall while rock climbing, landing on her buttocks and falling forward. Despite prolonged airlift to the ED, she is hemodynamically stable. She complains of bilateral pain in her legs, distal to her knees. She has profound weakness in her bilaterally extensor hallucis longi and gastrocsoleus complexes and has marked saddle anesthesia. MRI shows a large, midline herniated disc, compressing each of the traversing nerve roots and entire cauda equina below its level, but sparing the exiting nerve roots. Which disc is most likely involved in this injury?

Accepted Answer

L4-5

Answer

L2-3

Answer

L3-4

Answer

L5-S1

Question 3

Schmorl's nodule is a radiographic finding seen in which of the following conditions?

Accepted Answer

Intervertebral disc prolapse

Answer

Spondylolisthesis

Answer

Ankylosing spondylitis

Answer

Fracture of transverse process vertebra

Question 4

What is the type of fracture shown?

Accepted Answer

Hangman's fracture

Answer

Jefferson fracture

Answer

Clay Shoveler's fracture

Answer

Jones fracture

Question 5

A 10-year-old boy presents with scoliosis, a tuft of hair over the skin of the lumbar spine, and weakness with features of lower motor neuron paralysis in both lower limbs. An X-ray of the spine reveals fusion of the two lumbar vertebrae at that level. What is the most likely diagnosis?

Accepted Answer

Diastematomyelia

Answer

Hemivertebra

Answer

Sacrococcygeal teratoma

Answer

Spinal muscular atrophy

Question 6

Which of the following are indicators of poor prognosis in Pott's spine?

Accepted Answer

Healed vertebral lesion, Grade 4 Pott's spine, and kyphotic angle > 60 degrees are true; short duration and acute onset are false.

Answer

Healed vertebral lesion, Grade 4 Pott's spine, and short duration are true; kyphotic angle > 60 degrees and acute onset are false.

Answer

Healed vertebral lesion and Grade 4 Pott's spine are true; kyphotic angle > 60 degrees, short duration, and acute onset are false.

Answer

All indicators are true.

Question 7

Arrange the following conditions according to the worsening stages in Tuli's clinical staging: paraplegia in extension, ankle clonus present with extensor plantar response and no sensory deficit, no sensory deficit with motor deficit and ambulatory with support, paraplegia in flexion?

Accepted Answer

Ankle clonus present, extensor plantar response, no sensory deficit -> No sensory deficit, motor deficit, ambulatory with support -> Paraplegia in extension -> Paraplegia in flexion

Answer

No sensory deficit, motor deficit, ambulatory with support -> Ankle clonus present, extensor plantar response, no sensory deficit -> Paraplegia in extension -> Paraplegia in flexion

Answer

No sensory deficit, motor deficit, ambulatory with support -> Paraplegia in extension -> Ankle clonus present, extensor plantar response, no sensory deficit -> Paraplegia in flexion

Answer

Ankle clonus present, extensor plantar response, no sensory deficit -> Paraplegia in extension -> No sensory deficit, motor deficit, ambulatory with support -> Paraplegia in flexion

Question 8

Minerva jacket is used for which of the following conditions?

Accepted Answer

Cervical tuberculosis

Answer

Dorsolumbar tuberculosis

Answer

Lumbar tuberculosis

Answer

Sacral tuberculosis

Question 9

Which of the following is NOT an indication for surgery in Pott's spine?

Accepted Answer

Stage 3 disease

Answer

No clinical improvement after 4 weeks of anti-tuberculosis treatment (ATT)

Answer

Bowel and bladder involvement

Answer

Stage 4 disease

Question 10

A 27-year-old woman presents with pain and numbness in her right arm and hand, exacerbated by raising her arm overhead. A provisional diagnosis is made. Which of the following statements is true regarding this condition?

Accepted Answer

If conservative measures fail, surgical decompression of the brachial plexus is the best treatment.

Answer

It is associated with cervical spine disk disease.

Answer

It is reliably diagnosed by positional obliteration of the radial pulse.

Answer

It most commonly affects the median nerve.

Spine Disorders — MCQs

Spine Disorders — MCQs

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