Articular System — MCQs
Which of the following is not a ball and socket type of joint?
What is the condition commonly known as jumper's knee?
Bones are held by a long cord or sheet of dense fibrous connective tissue called:
Which of the following statements about osteoarthritis is false?
A 55-year-old male, known smoker, complains of calf pain while walking. He experiences calf pain while walking but can continue walking with effort. Which grade of claudication does this patient fall under?
Following are the common sites of Avascular necrosis, EXCEPT:
The connection of two bony structures with a ligament is known as
Which of the following statements about articular cartilage is true?
Ducts of Bellini are present in:
Identify the type of joint in the image provided.
Articular System Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is not a ball and socket type of joint?
- A. Incudostapedeal joint
- B. Talocalcaneonavicular joint
- C. Calcaneocuboid joint (Correct Answer)
- D. Shoulder joint
Explanation: ***Calcaneocuboid joint*** - The calcaneocuboid joint is a **saddle joint** (or modified plane joint), which allows for movement primarily in gliding motions, but not the multi-axial movement characteristic of a ball-and-socket joint. - Its structure, specifically the **reciprocally saddle-shaped articular surfaces** of the calcaneus and cuboid bones, limits its range of motion to primarily inversion and eversion during foot movements. *Talocalcaneonavicular joint* - This joint functions as a **modified ball-and-socket joint**, allowing for complex movements like pronation and supination of the foot. - It involves the head of the talus acting as the 'ball' articulating with the navicular anteriorly and the sustentaculum tali of the calcaneus posteriorly, forming a socket. - This unique configuration allows for multi-axial movement essential for foot adaptation to terrain. *Incudostapedial joint* - This is a **synovial saddle-type joint** (not a ball-and-socket joint) found in the middle ear, connecting the lenticular process of the incus and the head of the stapes. - It allows for limited rocking motion to efficiently transmit sound vibrations through the ossicular chain. - The joint permits only small amplitude movements necessary for auditory function, not the multi-axial freedom of a ball-and-socket joint. *Shoulder joint* - The shoulder joint, also known as the **glenohumeral joint**, is a classic example of a **ball-and-socket joint**, offering the widest range of motion in the human body. - The **head of the humerus** (ball) articulates with the **glenoid fossa** of the scapula (socket), allowing for flexion, extension, abduction, adduction, rotation, and circumduction.
Question 2: What is the condition commonly known as jumper's knee?
- A. Inflammation of the patellar tendon at its insertion on the patella.
- B. Tendinopathy of the quadriceps tendon.
- C. Injury to the hamstring tendon.
- D. Patellar tendonitis due to overuse of the patellar tendon. (Correct Answer)
Explanation: ***Patellar tendonitis due to overuse of the patellar tendon.*** - **Jumper's knee** is the common term for **patellar tendonitis**, which specifically refers to inflammation of the patellar tendon. - This condition is frequently caused by **overuse**, especially in activities involving repetitive jumping and landing. *Inflammation of the patellar tendon at its insertion on the patella.* - While jumper's knee does involve inflammation of the patellar tendon, it is more commonly at its insertion on the **tibial tubercle** or specifically its origin at the **inferior pole of the patella**, not necessarily at the patella itself. - This option is less precise as it describes only one aspect of the condition without mentioning the critical role of overuse. *Tendinopathy of the quadriceps tendon.* - **Tendinopathy of the quadriceps tendon** is a distinct condition affecting the tendon above the patella, known as **quadriceps tendinopathy**. - It presents with pain proximal to the patella, differentiating it from jumper's knee, which involves the tendon distal to the patella. *Injury to the hamstring tendon.* - An **injury to the hamstring tendon** would cause pain and symptoms on the posterior aspect of the knee or thigh. - This is completely unrelated to jumper's knee, which is characterized by anterior knee pain.
Question 3: Bones are held by a long cord or sheet of dense fibrous connective tissue called:
- A. Synchondrosis.
- B. Gomphosis.
- C. Suture.
- D. Syndesmosis. (Correct Answer)
Explanation: ***Syndesmosis*** - A **syndesmosis** is a type of fibrous joint where bones are joined by a cord or sheet of **dense fibrous connective tissue**, such as an interosseous membrane. - Examples include the articulation between the **tibia and fibula**, and the **ulna and radius**, allowing for limited movement. *Synchondrosis* - A **synchondrosis** is a cartilaginous joint joined by **hyaline cartilage**, typically seen in temporary joints like epiphyseal plates. - This type of joint eventually **ossifies** in adulthood, forming a synostosis. *Gomphosis* - A **gomphosis** is a fibrous joint that anchors a tooth to its bony socket, characterized by the insertion of a **peg-like structure** into a socket. - The connective tissue in a gomphosis is primarily the **periodontal ligament**. *Suture* - A **suture** is a type of fibrous joint found only in the skull, connecting bones with a narrow, interlocking seam of **dense fibrous connective tissue** [1]. - These joints are **immobile** in adults, providing protection for the brain.
Question 4: Which of the following statements about osteoarthritis is false?
- A. Progressive softening of the articular cartilage
- B. It is an inflammatory arthritis (Correct Answer)
- C. Does not involve synovial joints
- D. Does not produce marginal osteophytes
Explanation: ***It is an inflammatory arthritis*** - This statement is **false** because **osteoarthritis (OA)** is fundamentally a **degenerative joint disease**, not a primary inflammatory arthritis. - While it can have an inflammatory component, this is secondary to cartilage breakdown, and it does not share the systemic inflammatory features of conditions like rheumatoid arthritis. *Does not involve synovial joints* - This statement is false because **osteoarthritis** primarily affects **synovial joints**, such as the knees, hips, and hands. - It involves the progressive degeneration of articular cartilage within these synovial joints, leading to pain and dysfunction. *Progressive softening of the articular cartilage* - This statement is true, as **progressive softening of the articular cartilage** is a key pathological feature of **osteoarthritis**. - This softening precedes fibrillation and eventual loss of cartilage, leading to bone-on-bone contact and further joint damage. *Does not produce marginal osteophytes* - This statement is false because the formation of **marginal osteophytes** (bone spurs) is a hallmark feature of advanced **osteoarthritis**. - These bony outgrowths develop at the joint margins as the body attempts to repair or stabilize the damaged joint.
Question 5: A 55-year-old male, known smoker, complains of calf pain while walking. He experiences calf pain while walking but can continue walking with effort. Which grade of claudication does this patient fall under?
- A. Grade I (Mild claudication)
- B. Grade II (Moderate claudication) (Correct Answer)
- C. Grade III (Severe claudication)
- D. Grade IV (Ischemic rest pain)
Explanation: ***Grade II (Moderate claudication)*** - **Grade II claudication** is characterized by **intermittent claudication** where the patient experiences pain while walking but can **continue walking with effort**. - This level of claudication reflects a moderate degree of peripheral arterial disease, where blood flow is sufficiently compromised to cause pain with exertion but not severe enough to force immediate cessation of activity. - The patient in this scenario can continue ambulation despite discomfort, which is the defining feature of this grade. *Grade I (Mild claudication)* - **Grade I claudication** involves discomfort or pain that the patient can **tolerate without significantly altering their gait or pace**. - In this stage, the pain is minimal, and the patient may perceive it as a dull ache or mild fatigue rather than true pain. - Walking can continue without significant effort or limitation. *Grade III (Severe claudication)* - **Grade III claudication** is marked by pain that is **severe enough to stop the patient from walking within a short distance** (typically less than 200 meters). - The pain forces the patient to rest and recover before they can resume walking. - This represents significant functional limitation in daily activities. *Grade IV (Ischemic rest pain)* - **Grade IV**, also known as **critical limb ischemia**, involves **pain even at rest**, especially in the feet or toes, often worsening at night when the limb is elevated. - This stage indicates severe arterial obstruction and is frequently associated with **ulcers, non-healing wounds, or gangrene**. - This represents advanced peripheral arterial disease requiring urgent intervention. **Note:** This grading system is a simplified clinical classification. The standard medical classifications for peripheral arterial disease are the **Fontaine classification** (Stages I-IV) and **Rutherford classification** (Categories 0-6).
Question 6: Following are the common sites of Avascular necrosis, EXCEPT:
- A. Head of the femur
- B. The body of talus
- C. Patella (Correct Answer)
- D. Proximal half of scaphoid
Explanation: ***Patella*** - The patella is rarely affected by **avascular necrosis (AVN)** due to its robust and redundant blood supply, making it an exception to common AVN sites. - While patellar fractures can compromise local blood flow, spontaneous or atraumatic AVN of the patella is exceedingly uncommon compared to other skeletal sites. *Head of the femur* - The **femoral head** is the most common site for **avascular necrosis** due to its precarious blood supply, especially after trauma (e.g., hip dislocation, femoral neck fracture) or in systemic conditions. - Its blood supply relies heavily on the **medial circumflex femoral artery**, which can be easily disrupted. *The body of talus* - The **talus** is highly susceptible to **avascular necrosis**, particularly after fractures or dislocations, as its blood supply enters through a limited number of soft tissue attachments. - The **body of the talus** receives a significant portion of its blood supply from vessels that can be easily compromised by injury. *Proximal half of scaphoid* - The **proximal pole of the scaphoid** is notoriously prone to **avascular necrosis** following scaphoid fractures because its blood supply enters primarily from the distal pole. - A disruption of blood flow (e.g., via the **dorsal carpal branch** of the radial artery) due to a fracture can lead to **non-union** and AVN of the proximal fragment.
Question 7: The connection of two bony structures with a ligament is known as
- A. Diarthrosis
- B. Syndesmosis (Correct Answer)
- C. Synchondrosis
- D. Synostosis
Explanation: Syndesmosis - A syndesmosis is a type of fibrous joint where two bones are joined by a ligament, band of fibrous tissue, or interosseous membrane. - Examples include the distal tibiofibular joint and the interosseous membrane between the radius and ulna. Diarthrosis - Diarthrosis refers to a freely movable joint, also known as a synovial joint, which has a joint capsule, synovial fluid, and articular cartilage. - This term describes the degree of movement rather than the specific tissue uniting the bones. Synchondrosis - A synchondrosis is a type of cartilaginous joint where two bones are joined by hyaline cartilage. - Examples include the epiphyseal plates in growing bones and the joint between the first rib and the sternum. Synostosis - A synostosis is a joint where two bones that were originally separate have fused completely, resulting in a solid bony union. - This represents the ossification of a fibrous or cartilaginous joint over time, such as the cranial sutures in adults or the sacrum.
Question 8: Which of the following statements about articular cartilage is true?
- A. Very vascular structure
- B. Surrounded by thick perichondrium
- C. Has no nerve supply (Correct Answer)
- D. Fibrocartilage
Explanation: ***Has no nerve supply*** - Articular cartilage is **aneural**, meaning it lacks nerve endings, which is why damage to it doesn't immediately cause pain until underlying bone or surrounding tissues are affected [1]. - Its aneural nature contributes to its low metabolic activity and limited capacity for repair. *Very vascular structure* - Articular cartilage is **avascular**, meaning it lacks a direct blood supply [1]. - It receives nutrients primarily through diffusion from the synovial fluid [1]. *Surrounded by thick perichondrium* - Articular cartilage is typically **not covered by a perichondrium**, unlike most other types of cartilage. - The absence of perichondrium prevents potential ossification of the articular surface. *Fibrocartilage* - Articular cartilage is primarily composed of **hyaline cartilage**, not fibrocartilage [1]. - **Hyaline cartilage** provides a smooth, low-friction surface for joint movement and acts as a shock absorber [1].
Question 9: Ducts of Bellini are present in:
- A. Pancreas
- B. Liver
- C. Kidney (Correct Answer)
- D. Salivary gland
Explanation: ***Kidney*** - The Ducts of Bellini, also known as **large papillary collecting ducts**, are the terminal portions of the collecting duct system in the kidney. - They are located in the **renal medulla**, particularly within the renal papillae, and drain urine into the minor calyces. *Pancreas* - The pancreas is involved in **digestion** and hormone production (e.g., insulin), not urine formation. - Its duct system includes the **main pancreatic duct (Wirsung's duct)** and accessory pancreatic duct. *Liver* - The liver's primary functions are **metabolism**, detoxification, and bile production. Its duct system consists of **bile ducts**, which transport bile, not urine [1], [2]. - Its duct system consists of **bile ducts**, which transport bile, not urine. *Salivary gland* - Salivary glands produce **saliva** and have their own unique duct systems (e.g., Wharton's duct, Stensen's duct). - These glands are part of the digestive system and are not involved in renal function.
Question 10: 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.
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