Vertebral Joints and Ligaments — MCQs
Jefferson's fracture is:
All of the following contribute to the intervertebral disc EXCEPT:
What is the classification of intelligence corresponding to an IQ score of 90-109?
Ligamentum flavum consists of which fibres:
False about fracture of vertebrae
Match the following: A) Caplan syndrome- 1) Found first in coal worker B) Asbestosis- 2) Upper lobe predominance C) Mesothelioma- 3) Involves lower lobe D) Sarcoidosis- 4) Pleural effusion is seen
A 30-year-old male presents with pain and limited movement in his shoulder following a fall. X-ray reveals an anterior dislocation of the glenohumeral joint. Which of the following structures is most likely to be damaged in this injury?
Identify the type of joint in the image provided.
Which ligament is primarily responsible for anteroposterior stability of the knee?
What constitutes a spinal motion segment?
Vertebral Joints and Ligaments Indian Medical PG Practice Questions and MCQs
Question 1: Jefferson's fracture is:
- A. Avulsion fracture of C7
- B. Fracture of Axis
- C. Fracture of Atlas (Correct Answer)
- D. Due to fracture of traumatic spondylolisthesis of C2 over C3
Explanation: ***Fracture of Atlas*** - A **Jefferson's fracture** specifically refers to a burst fracture of the **C1 vertebra** (atlas). - This type of fracture often results from an **axial loading injury** to the head, transmitting force through the occipital condyles to the C1 lateral masses. *Avulsion fracture of C7* - An **avulsion fracture of C7** is commonly known as a **clay-shoveler's fracture**, which is distinct from a Jefferson's fracture. - It typically results from **sudden powerful neck flexion** or muscle contraction, causing a spinous process to be pulled away. *Fracture of Axis* - The **axis (C2 vertebra)** is involved in fractures such as a **hangman's fracture**, which is a bilateral pedicle fracture. - While C2 fractures are also cervical spine injuries, they are anatomically and mechanistically different from C1 fractures. *Due to fracture of traumatic spondylolisthesis of C2 over C3* - **Traumatic spondylolisthesis of C2 over C3** describes a type of fracture-dislocation, often involving the pedicles of C2. - This specific injury is generally associated with different forces and bone involvement than a burst fracture of the C1 ring.
Question 2: All of the following contribute to the intervertebral disc EXCEPT:
- A. Fibrocartilage
- B. Elastic cartilage (Correct Answer)
- C. Annulus fibrosus
- D. Nucleus pulposus
Explanation: ***Elastic cartilage*** - **Elastic cartilage** is characterized by the presence of **elastic fibers**, providing flexibility to structures like the ear and epiglottis. - It is **not found** within the intervertebral disc, which requires specific properties for weight-bearing and shock absorption. *Fibrocartilage* - **Fibrocartilage** is a primary component of the **annulus fibrosus** and plays a crucial role in providing tensile strength and resisting compressive forces [1]. - Its presence is essential for the structural integrity and function of the intervertebral disc. *Annulus fibrosus* - The **annulus fibrosus** is the **tough, outer fibrous ring** of the intervertebral disc, composed of concentric layers of fibrocartilage. - It encircles the nucleus pulposus, containing it and providing stability to the disc. *Nucleus pulposus* - The **nucleus pulposus** is the **gel-like core** of the intervertebral disc, rich in proteoglycans and water. - It acts as a shock absorber and allows for flexibility between vertebrae.
Question 3: What is the classification of intelligence corresponding to an IQ score of 90-109?
- A. Below average
- B. Average (Correct Answer)
- C. Slightly below average
- D. Above average
Explanation: ***Average*** - An **IQ score** range of **90-109** is traditionally classified as **Average** intelligence. - This range represents the **mean** and surrounding **standard deviation** of IQ scores in the general population. *Below average* - This classification usually corresponds to IQ scores in the range of **70-79** or **80-89**, depending on the specific scale. - It does not represent the central tendency of the population's intelligence. *Slightly below average* - This category typically corresponds to IQ scores in the range of **80-89**. - It falls just below the average range but is not as low as the "below average" classification. *Above average* - This classification is typically assigned to IQ scores that are in the range of **110-119** or higher. - It signifies cognitive abilities that are greater than the majority of the population.
Question 4: Ligamentum flavum consists of which fibres:
- A. Elastic (Correct Answer)
- B. Type-I collagen
- C. Reticular
- D. Type-II collagen
Explanation: The ligamentum flavum is predominantly composed of elastic fibers [1], which allow it to stretch and recoil during spinal movements. This high elastic content helps maintain the upright posture of the spine and prevents excessive flexion. Type I collagen is the most abundant collagen type, forming strong, inextensible fibers found in structures like tendons, ligaments, and bone, but is not the primary component of ligamentum flavum [1]. While present in some ligaments, its dominance would make the ligamentum flavum too stiff for its role in the spinal canal. Reticular fibers are fine, branching collagen fibers (primarily type III collagen) that form a supportive network in soft tissues and organs, but they are not a major component of the ligamentum flavum. Type II collagen is the primary collagen type found in hyaline cartilage and elastic cartilage, providing resistance to pressure. It is not a significant component of ligaments, especially those requiring high elasticity like the ligamentum flavum.
Question 5: False about fracture of vertebrae
- A. Fracture dislocation is common in flexion rotation injury
- B. Chance fracture occurs due to flexion distraction injury
- C. Wedge compression causes flexion injury
- D. Anterior longitudinal ligament runs along the posterior surface of vertebral bodies (Correct Answer)
Explanation: ***Anterior longitudinal ligament runs along the posterior surface of vertebral bodies*** - The **anterior longitudinal ligament (ALL)** runs along the **anterior aspect** of the vertebral bodies, preventing hyperextension. - The **posterior longitudinal ligament (PLL)** runs along the posterior surface of the vertebral bodies, within the vertebral canal. *Fracture dislocation is common in flexion rotation injury* - **Flexion-rotation injuries** are highly unstable and frequently lead to **fracture-dislocations** of the vertebral column. - The combined forces cause significant disruption of both bony and ligamentous structures, increasing the likelihood of displacement. *Chance fracture occurs due to flexion distraction injury* - A **Chance fracture** (or seatbelt fracture) is caused by a **flexion-distraction injury**, typically seen in individuals wearing lap belts during deceleration. - This mechanism results in a horizontal splitting of the vertebral body and posterior elements. *Wedge compression causes flexion injury* - A **wedge compression fracture** is the most common type of vertebral fracture and results from a **flexion injury** (hyperflexion). - The anterior portion of the vertebral body collapses, creating a wedge shape, while the posterior column remains intact.
Question 6: Match the following: A) Caplan syndrome- 1) Found first in coal worker B) Asbestosis- 2) Upper lobe predominance C) Mesothelioma- 3) Involves lower lobe D) Sarcoidosis- 4) Pleural effusion is seen
- A. A-3, B-4, C-2, D-1
- B. A-1, B-4, C-3, D-2 (Correct Answer)
- C. A-4, B-2, C-3, D-1
- D. A-2, B-4, C-3, D-1
Explanation: **A-1, B-4, C-3, D-2** - **Caplan syndrome** was first described in **coal workers** with **rheumatoid arthritis** and progressive massive fibrosis. - **Asbestosis** is often associated with **pleural effusion**, which can be benign or malignant. - **Mesothelioma** typically involves the **lower lobes** of the lungs, specifically the pleura, and is strongly linked to asbestos exposure. - **Sarcoidosis** is characterized by **non-caseating granulomas**, which have a predilection for the **upper lobes** of the lungs. *A-3, B-4, C-2, D-1* - This option incorrectly states that Caplan syndrome involves the lower lobe; **Caplan syndrome** is defined by the presence of large nodules in the lungs of coal workers with rheumatoid arthritis, and their specific lobar distribution is not a defining characteristic. - This option incorrectly states that Mesothelioma has an upper lobe predominance; **Mesothelioma** is a pleural malignancy and typically involves the **lower lobes**, extending along the pleura. *A-4, B-2, C-3, D-1* - This option incorrectly associates Caplan syndrome with pleural effusion; **Caplan syndrome** manifests as rheumatoid nodules in the lungs, not primarily pleural effusion. - This option incorrectly states that Asbestosis has an upper lobe predominance; **Asbestosis** predominantly affects the **lower lobes** of the lungs, causing interstitial fibrosis. *A-2, B-4, C-3, D-1* - This option incorrectly states that Caplan syndrome has an upper lobe predominance; the defining feature of **Caplan syndrome** is the combination of rheumatoid arthritis and pneumoconiosis, not specific lobar involvement. - This option correctly identifies pleural effusion with asbestosis and lower lobe involvement with mesothelioma, but **Caplan syndrome** is not characterized by upper lobe predominance.
Question 7: A 30-year-old male presents with pain and limited movement in his shoulder following a fall. X-ray reveals an anterior dislocation of the glenohumeral joint. Which of the following structures is most likely to be damaged in this injury?
- A. Long head of biceps tendon
- B. Acromioclavicular ligament
- C. Supraspinatus tendon
- D. Anterior inferior glenohumeral ligament (Correct Answer)
- E. Coracoclavicular ligament
Explanation: ***Anterior inferior glenohumeral ligament*** - This ligament is a primary static stabilizer against **anterior dislocation** of the shoulder; thus, it is frequently stretched or torn during such an event. - Damage to this ligament is often associated with a **Bankart lesion**, which is an injury to the anterior inferior labrum that can lead to recurrent dislocations. *Long head of biceps tendon* - While the **long head of the biceps tendon** can be injured in shoulder trauma, it is more commonly associated with chronic overuse or superior labral tears (**SLAP lesions**), rather than primary anterior dislocation. - Injuries to this tendon might occur as a secondary complication but are not the most likely primary soft tissue damage in an acute anterior dislocation. *Acromioclavicular ligament* - The **acromioclavicular ligament** stabilizes the **acromioclavicular (AC) joint**, which is distinct from the glenohumeral joint. - Injuries to this ligament typically result from direct trauma to the top of the shoulder, causing AC joint separation, not glenohumeral dislocation. *Supraspinatus tendon* - The **supraspinatus tendon** is part of the rotator cuff and is most commonly injured in impingement syndrome or rotator cuff tears, which can result from falls but are not the primary structure damaged in an **anterior glenohumeral dislocation**. - Its role is mainly in abduction of the arm, and while it can be involved in large tears associated with advanced age, it is not the initial or most common structure to fail in this specific injury. *Coracoclavicular ligament* - The **coracoclavicular ligament** is composed of the conoid and trapezoid ligaments, which are crucial for the stability of the **acromioclavicular (AC) joint**. - Injury to this ligament is indicative of a more severe AC joint separation (usually **type III or higher**) and is not the primary structure damaged in a glenohumeral dislocation.
Question 8: Identify the type of joint in the image provided.
- A. Syndesmosis
- B. Synarthrosis
- C. Synovial joint (Correct Answer)
- D. Symphysis
Explanation: ***Synovial joint*** - The image depicts a **costovertebral joint**, which connects a rib to a thoracic vertebra. These joints are **diarthrotic**, meaning they are freely movable, characteristic of synovial joints. - Synovial joints are characterized by the presence of a **synovial cavity**, articular cartilage, an articular capsule, and synovial fluid, allowing for a wide range of motion. *Syndesmosis* - A syndesmosis is a type of **fibrous joint** where two bones are joined by a ligament or a membrane, allowing for very limited movement, such as the distal tibiofibular joint. - This definition does not match the image, which shows a joint designed for movement between the rib and vertebra. *Synarthrosis* - Synarthrosis is a classification for **immovable joints**, such as sutures in the skull. - The costovertebral joints, as shown, allow for movement during respiration and are therefore not synarthrotic. *Symphysis* - A symphysis is a type of **cartilaginous joint** where bones are joined by **fibrocartilage**, allowing for slight movement. Examples include the pubic symphysis or intervertebral discs. - The costovertebral joint shown in the image is a synovial articulation, not a cartilaginous joint.
Question 9: Which ligament is primarily responsible for anteroposterior stability of the knee?
- A. Medial collateral ligament (MCL)
- B. Anterior Cruciate Ligament (ACL) (Correct Answer)
- C. Lateral collateral ligament (LCL)
- D. Patellar ligament
Explanation: ***Anterior Cruciate Ligament (ACL)*** - The **ACL** is crucial for preventing the **anterior translation of the tibia** relative to the femur, thus providing significant **anteroposterior stability**. - It also plays a role in limiting **rotational stability** of the knee joint. *Medial collateral ligament (MCL)* - The **MCL** is located on the inner side of the knee and primarily resists **valgus stress** (force from the outside inward), preventing the knee from bending too far inward. - Its main function is to provide **medial stability**, not anteroposterior stability. *Lateral collateral ligament (LCL)* - The **LCL** is situated on the outer side of the knee and primarily resists **varus stress** (force from the inside outward), preventing the knee from bending too far outward. - It contributes to **lateral stability** of the knee. *Patellar ligament* - The **patellar ligament** connects the **patella** to the **tibial tuberosity** and is an extension of the quadriceps tendon. - Its primary role is in **knee extension**, acting as part of the extensor mechanism, and it does not directly contribute to anteroposterior or rotational stability.
Question 10: What constitutes a spinal motion segment?
- A. A disc and the vertebrae above and below, including their interlocking facet joints. (Correct Answer)
- B. A disc and the facet joints at that level.
- C. A vertebral body and the disc above.
- D. A section of the spine involved in a physiological curve with the similar function (i.e. thoracic kyphosis).
Explanation: ***A disc and the vertebrae above and below, including their interlocking facet joints.*** - A **spinal motion segment** or **functional spinal unit** is defined as two adjacent vertebrae and the intervertebral disc between them. - This unit includes all the associated **ligaments**, **capsules**, and especially the **facet joints**, which together allow for complex movements. *A disc and the facet joints at that level.* - This definition is incomplete as it misses the crucial component of the **vertebral bodies** themselves. - The vertebral bodies provide the main structural support and articulation points for the disc and facet joints. *A vertebral body and the disc above.* - This partial definition describes only a fraction of the components required for a functional segment. - It omits the **inferior vertebral body** and the critical **facet joints** that enable motion. *A section of the spine involved in a physiological curve with the similar function (i.e. thoracic kyphosis).* - This option describes a broader **region** of the spine rather than a single, functional motion unit. - A physiological curve involves multiple motion segments working in concert, not a single segment.
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