Arthroscopic Equipment and Setup — MCQs
Intrathecal fluorescein with endoscopic visualization is useful in diagnosis of?
The operative procedure known as "microfracture" is done for the
Which of the following statements about the use of an air-tor handpiece is true?
Postoperative third-space accumulation should be managed by intravenous fluid with
Charge transferred across rows of detector in a 'Bucket brigade' fashion is seen in:
A 65-year-old lady presented with a swollen and painful knee. On examination, she was found to have grade III osteoarthritic changes. What is the best course of action?
Which among the following is the BEST irrigating fluid during ECCE?
An athlete sustained an injury around the knee joint with suspected cartilage damage. Which of the following is the investigation of choice?
The joint cavity can be examined in detail with minimal surgical exposure by which procedure?
Triple deformity of the knee is present in which condition?
Arthroscopic Equipment and Setup Indian Medical PG Practice Questions and MCQs
Question 1: Intrathecal fluorescein with endoscopic visualization is useful in diagnosis of?
- A. Rhinitis Medicamentosa
- B. Multiple ethmoidal polyps
- C. Diagnosis of CSF Rhinorrhoea (Correct Answer)
- D. Deviated nasal septum
Explanation: ***Diagnosis of CSF Rhinorrhoea*** - **Intrathecal fluorescein** is instilled into the cerebrospinal fluid, and its presence in the nasal cavity via endoscopy confirms a **CSF leak**. - This method provides direct visualization of the leak site, which is crucial for surgical planning. *Rhinitis Medicamentosa* - This condition is caused by overuse of **topical decongestants** and characterized by nasal congestion, not a CSF leak. - Diagnosis is typically based on patient history and clinical examination rather than specialized imaging or dye studies. *Multiple ethmoidal polyps* - **Ethmoidal polyps** are benign growths in the ethmoid sinuses, causing nasal obstruction and anosmia. - Diagnosis is made via nasal endoscopy and CT scan, and fluorescein staining is not indicated. *Deviated nasal septum* - A **deviated nasal septum** is a structural abnormality causing unilateral or bilateral nasal obstruction. - Diagnosis is clinical and confirmed by anterior rhinoscopy or nasal endoscopy, with no role for intrathecal fluorescein.
Question 2: The operative procedure known as "microfracture" is done for the
- A. Delayed union of femur
- B. Osteochondral defect of femur (Correct Answer)
- C. Non union of tibia
- D. Loose bodies of ankle joint
Explanation: ***Osteochondral defect of femur*** - **Microfracture** is a surgical technique used to stimulate the growth of **fibrocartilage** in areas of damaged articular cartilage, such as an **osteochondral defect**. - It involves creating small holes in the **subchondral bone** to allow stem cells and growth factors from the bone marrow to form a new reparative tissue. *Delayed union of femur* - **Delayed union** typically involves an extended time for fracture healing, which is often managed through prolonged immobilization, **bone grafting**, or sometimes revision surgery. - Microfracture specifically targets cartilage repair, not the process of **bony union** after a fracture. *Non union of tibia* - **Non-union** refers to the failure of a fractured bone to heal within a reasonable timeframe, often requiring surgical intervention with **bone grafts** or **internal fixation**. - This condition involves bone healing problems, distinct from cartilage defects that microfracture addresses. *Loose bodies of ankle joint* - **Loose bodies** in a joint are typically removed surgically, often arthroscopically, to relieve pain and prevent joint damage. - This procedure does not involve the repair of cartilage defects, which is the primary goal of microfracture.
Question 3: Which of the following statements about the use of an air-tor handpiece is true?
- A. The noise level of the air-tor handpiece exceeds 75 decibels, which can cause hearing damage with prolonged exposure. (Correct Answer)
- B. Prolonged use of the air-tor handpiece may cause discomfort in elderly patients due to pre-existing conditions.
- C. The air-tor handpiece is safe for use in younger teeth with proper precautions.
- D. The frequency of rotation of bur is 6000-8000rpm
Explanation: ***The noise level of the air-tor handpiece exceeds 75 decibels, which can cause hearing damage with prolonged exposure.*** - **Air-rotor handpieces** operate at very high speeds, generating significant noise levels that typically surpass **75 dB**. - Prolonged exposure to noise levels above **85 dB** is known to cause **noise-induced hearing loss**, making this a significant occupational hazard for dental professionals. *Prolonged use of the air-tor handpiece may cause discomfort in elderly patients due to pre-existing conditions.* - While patient discomfort can be a concern, the primary and most substantiated risk directly attributable to the device's operation, as stated in the true option, is **hearing damage** to the operator. - The discomfort experienced by elderly patients is more broadly related to the entire dental procedure and their overall health, rather than a specific unique risk of the air-rotor handpiece itself. *The air-tor handpiece is safe for use in younger teeth with proper precautions.* - The safety of an **air-rotor handpiece** on **younger teeth** is highly dependent on operator skill, appropriate use, and patient cooperation. - However, the statement does not address the inherent risk of noise exposure, which is a constant regardless of the patient's age. *The frequency of rotation of bur is 6000-8000rpm* - The **air-rotor handpiece** operates at much higher speeds, typically ranging from **200,000 to 400,000 rpm**, enabling efficient tooth preparation. - The rotational speeds of 6,000-8,000 rpm are characteristic of **low-speed handpieces** used for procedures like finishing, polishing, or caries excavation.
Question 4: Postoperative third-space accumulation should be managed by intravenous fluid with
- A. Albumin
- B. Normal saline (Correct Answer)
- C. Fluid restriction
- D. Dextrose in water
Explanation: ***Normal saline*** - **Third-space accumulation** leads to fluid shifts from the intravascular space to the interstitial space, commonly seen after trauma or surgery, resulting in **hypovolemia**. - **Isotonic solutions** like normal saline help replenish the lost intravascular volume and maintain blood pressure without shifting more fluid into the third space. *Albumin* - While albumin can increase oncotic pressure and draw fluid back into the intravascular space, it is typically reserved for cases of **severe hypoalbuminemia** or when crystalloids alone are insufficient. - Using albumin in the setting of acute third-space loss without clear indications of hypoalbuminemia may not be the initial or most appropriate intervention. *Fluid restriction* - **Fluid restriction** would worsen the patient's hypovolemia as third-space losses deplete the effective circulating volume of the patient. - This approach is appropriate for conditions like **heart failure** or **SIADH**, where there is true fluid excess or impaired excretion, not for hypovolemic states due to fluid shifts. *Dextrose in water* - Dextrose in water is a **hypotonic solution** that would rapidly distribute into the intracellular and interstitial compartments and may contribute to worsening edema in the third space. - It does not effectively expand intravascular volume and can lead to **hyponatremia** if administered in large quantities.
Question 5: Charge transferred across rows of detector in a 'Bucket brigade' fashion is seen in:
- A. CMOS
- B. CCD (Correct Answer)
- C. Flat panel detector
- D. PSP
Explanation: ***CCD*** - Charged Coupled Devices (CCDs) operate by transferring accumulated charge from one photographic element to the next in a sequential "bucket brigade" fashion to a read-out node. - This method allows for efficient and low-noise conversion of incident light into an electrical signal. *CMOS* - **CMOS (Complementary Metal-Oxide Semiconductor)** sensors read out each pixel individually, rather than transferring charge along a chain. - Each pixel in a CMOS sensor typically has its own **photodetector** and read-out amplifier. *Flat panel detector* - **Flat panel detectors (FPDs)**, commonly used in digital radiography, convert X-rays directly or indirectly into an electrical signal. - They do not use a "bucket brigade" charge transfer mechanism; instead, they have a matrix of **thin-film transistors (TFTs)** that collect and read out the signal from individual detector elements. *PSP* - **Photostimulable phosphor (PSP)** plates store X-ray energy as a latent image, which is then read by scanning with a laser to release light proportional to the absorbed energy. - This is an analog storage and read-out process and does not involve the electronic "bucket brigade" charge transfer found in CCDs.
Question 6: A 65-year-old lady presented with a swollen and painful knee. On examination, she was found to have grade III osteoarthritic changes. What is the best course of action?
- A. Conservative management
- B. Total knee replacement (Correct Answer)
- C. Arthroscopic washing
- D. Partial knee replacement
Explanation: ***Total knee replacement*** - For **grade III osteoarthritis** in a 65-year-old, a total knee replacement is the most definitive and effective treatment to relieve pain and restore function in a severely damaged joint. - This procedure addresses widespread cartilage loss and structural changes typical of advanced osteoarthritis. *Conservative management* - This approach is typically favored for **mild to moderate osteoarthritis**, involving physical therapy, NSAIDs, and lifestyle modifications. - For **grade III changes** with significant pain and swelling, conservative measures are unlikely to provide sufficient relief or halt disease progression effectively. *Arthroscopic washing* - **Arthroscopic lavage** and debridement are rarely recommended for osteoarthritis as they have not shown sustained benefits for pain or function. - It is sometimes used for specific mechanical symptoms, but it does not address the underlying cartilage loss and structural damage in severe osteoarthritis. *Partial knee replacement* - A **partial knee replacement** is suitable when osteoarthritis is confined to a single compartment of the knee, and the other compartments are healthy. - Given the indication of "grade III osteoarthritic changes" without specifying a single compartment, a total knee replacement is generally more appropriate for widespread disease.
Question 7: Which among the following is the BEST irrigating fluid during ECCE?
- A. Ringer lactate
- B. Normal saline
- C. Balanced salt solution
- D. Balanced salt solution + glutathione (Correct Answer)
Explanation: ***Balanced salt solution + glutathione*** - **Balanced salt solution with glutathione** is considered the best irrigating fluid for ECCE because it closely mimics the **natural aqueous humor**, maintaining corneal endothelial cell health and viability during surgery. - The addition of **glutathione** provides an antioxidant effect, protecting the corneal endothelium from oxidative stress and maintaining its metabolic function during prolonged irrigation. *Ringer lactate* - While **Ringer's lactate** is a balanced electrolyte solution, it lacks the specific components and buffering capacity present in specialized ophthalmic irrigating solutions. - It does not contain **glutathione** or other agents crucial for maintaining corneal endothelial viability and function during intraocular surgery. *Normal saline* - **Normal saline (0.9% NaCl)** lacks essential ions (calcium, magnesium, potassium) and appropriate pH buffering required for intraocular use. - Its use can lead to **corneal edema** and endothelial cell damage due to ionic imbalance and the absence of protective components found in balanced salt solutions. *Balanced salt solution* - A **plain balanced salt solution (BSS)** is a significant improvement over normal saline or Ringer's lactate as it is physiologically balanced for intraocular use, containing essential electrolytes. - However, it lacks the **antioxidant properties of glutathione**, which provides superior protection to corneal endothelial cells during extended surgical procedures.
Question 8: An athlete sustained an injury around the knee joint with suspected cartilage damage. Which of the following is the investigation of choice?
- A. X-ray
- B. Clinical examination
- C. Arthroscopy (Correct Answer)
- D. Arthrotomy
Explanation: **Explanation:** The investigation of choice for suspected intra-articular cartilage damage is **Arthroscopy**. It is considered the **"Gold Standard"** because it allows for direct visualization of the articular surfaces, menisci, and ligaments under magnification. Unlike imaging, it provides a dynamic assessment of the tissue's integrity and allows the surgeon to perform immediate therapeutic interventions (e.g., debridement or chondroplasty). **Analysis of Options:** * **X-ray (Option A):** X-rays are excellent for visualizing bony injuries or fractures but are poor at showing soft tissues like cartilage or menisci. They are usually the first-line screening tool but are not definitive for cartilage damage. * **Clinical Examination (Option B):** While essential for initial diagnosis (e.g., McMurray’s or Lachman tests), clinical exams are subjective and can be limited by pain, swelling, or muscle guarding in an acute athlete injury. * **Arthrotomy (Option D):** This involves a large surgical incision to open the joint. It is highly invasive and has been largely replaced by arthroscopy due to higher morbidity and longer recovery times. **Clinical Pearls for NEET-PG:** * **MRI vs. Arthroscopy:** While MRI is the investigation of choice for *non-invasive* screening of soft tissue injuries, **Arthroscopy** remains the overall "Gold Standard" for definitive diagnosis and treatment. * **Triad of O'Donoghue:** Often seen in athletes, involving injury to the ACL, MCL, and Medial Meniscus. * **Arthroscopy Media:** Normal saline or Ringer’s Lactate is used to distend the joint during the procedure. * **Common Portals:** The anterolateral portal is the most common primary portal used in knee arthroscopy.
Question 9: The joint cavity can be examined in detail with minimal surgical exposure by which procedure?
- A. Sialography
- B. Arthroscopy (Correct Answer)
- C. Biopsy
- D. Endoscopy
Explanation: **Explanation:** **Arthroscopy** is the correct answer because it is a minimally invasive surgical procedure used to visualize, diagnose, and treat problems inside a joint. It involves inserting a fiber-optic camera (arthroscope) through a small "portal" or stab incision. This allows for a detailed examination of the joint cavity (articular cartilage, ligaments, and synovium) with significantly less morbidity, faster recovery, and minimal surgical exposure compared to traditional open arthrotomy. **Analysis of Incorrect Options:** * **Sialography (A):** This is a radiographic examination of the salivary glands and ducts using a contrast medium. It is unrelated to joint pathology. * **Biopsy (C):** While a biopsy can be performed *during* an arthroscopy, the term refers to the removal of tissue for histological examination. It is a diagnostic technique, not a procedure designed for the comprehensive visualization of a joint cavity. * **Endoscopy (D):** This is a broad umbrella term for looking inside the body using an endoscope. While arthroscopy is technically a type of endoscopy, "Arthroscopy" is the specific and most appropriate clinical term for joint visualization. **High-Yield Clinical Pearls for NEET-PG:** * **Triangulation:** The fundamental skill in arthroscopy where the scope and the surgical instrument meet at a specific point within the joint to perform a task. * **Distension Media:** Normal saline or Ringer’s Lactate is used to expand the joint space for better visualization. * **Common Sites:** The **knee** is the most common joint examined via arthroscopy, followed by the shoulder and ankle. * **Complications:** Although rare, the most common complication of arthroscopy is **hemarthrosis** (bleeding into the joint).
Question 10: Triple deformity of the knee is present in which condition?
- A. Tuberculosis of the knee (Correct Answer)
- B. Pyogenic arthritis of the knee
- C. Osteoarthritis of the knee
- D. None of the above
Explanation: **Explanation:** The **Triple Deformity of the Knee** is a classic clinical feature of advanced **Tuberculosis (TB) of the knee joint**. It occurs due to the progressive destruction of the joint surfaces and the weakening of the cruciate and collateral ligaments, combined with the powerful pull of the hamstring muscles. The "Triple Deformity" consists of: 1. **Flexion:** Due to the spasm and contracture of the hamstrings. 2. **Posterior Subluxation of the Tibia:** The ACL and PCL are destroyed, allowing the tibia to slip backward on the femur. 3. **External Rotation of the Tibia:** The biceps femoris pulls the tibia laterally. **Why other options are incorrect:** * **Pyogenic Arthritis:** While it causes rapid joint destruction and flexion deformity due to pain, it typically presents as an acute emergency. It does not usually progress to the specific "triple" chronic malalignment seen in the indolent, long-standing course of TB. * **Osteoarthritis (OA):** OA typically presents with a **Varus (bow-leg)** deformity due to the collapse of the medial compartment. Posterior subluxation and significant external rotation are not characteristic features of OA. **Clinical Pearls for NEET-PG:** * **Stages of TB Knee:** Stage 1 (Synovitis), Stage 2 (Arthritis/Early destruction), Stage 3 (Erosion/Triple deformity), Stage 4 (Ankylosis - usually fibrous). * **Phemister’s Triad (Radiology):** Juxta-articular osteopenia, peripheral osseous erosions, and gradual narrowing of the joint space. * **Treatment:** TB of the knee is primarily managed with **AKT (Antitubercular Therapy)** and splinting. Surgery (Synovectomy or Arthrodesis) is reserved for specific indications.
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