Patient-Specific Instrumentation Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Patient-Specific Instrumentation. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Patient-Specific Instrumentation Indian Medical PG Question 1: Most common bone for which nailing is done
- A. Radius
- B. Ulna
- C. Tibia (Correct Answer)
- D. Humerus
Patient-Specific Instrumentation Explanation: ***Tibia***
- The **tibia** is the most common long bone for which **intramedullary nailing** (IM nailing) is performed, particularly for fractures of the **tibial shaft**.
- Its subcutaneous location and strong cortical bone make it amenable to this type of internal fixation, promoting stability and healing.
*Radius*
- Fractures of the **radius**, especially distal radial fractures, are more commonly treated with **plate and screw fixation** or external fixation, rather than intramedullary nailing.
- While IM nailing can be used for some radial shaft fractures, it is not the most common bone for this procedure.
*Ulna*
- Like the radius, the **ulna** is less frequently fixed with intramedullary nails; **plate and screw fixation** is generally preferred for ulnar shaft fractures.
- Its triangular cross-section and the presence of the interosseous membrane complicate IM nailing in some cases.
*Humerus*
- While **humeral shaft fractures** can be treated with intramedullary nailing, especially in comminuted or pathological fractures, it is overall less common than tibial nailing.
- The risk of shoulder and elbow stiffness, as well as radial nerve injury, are considerations with humeral nailing.
Patient-Specific Instrumentation Indian Medical PG Question 2: Back examination of polytrauma patient is done by which method:-
- A. Barrel roll
- B. Primary survey
- C. Logroll (Correct Answer)
- D. Chin lift
Patient-Specific Instrumentation Explanation: ***Logroll***
- The **logroll technique** is used to safely turn a polytrauma patient onto their side to examine their back while maintaining spinal immobilization.
- It requires multiple personnel (typically 3-5) to turn the patient as a single unit, preventing **unnecessary spinal movement** and potential injury.
*Barrel roll*
- This term is not a recognized medical technique for examining a polytrauma patient's back.
- It might refer to a maneuver in aviation or gymnastics, unrelated to patient care.
*Primary survey*
- The **primary survey** is the initial rapid assessment of a trauma patient focusing on life-threatening injuries (ABCDE: Airway, Breathing, Circulation, Disability, Exposure).
- While back examination is part of the "Exposure" component, the **logroll** is the *method* used for the examination, not the survey itself.
*Chin lift*
- The **chin lift** maneuver is used to open the airway in an unresponsive patient by lifting the chin upwards and supporting the jaw.
- It is an airway management technique and does not involve assessing the patient's back.
Patient-Specific Instrumentation Indian Medical PG Question 3: Which one of the following is not a component of THORACOSCORE?
- A. Performance status
- B. Complication of surgery (Correct Answer)
- C. Priority of surgery
- D. ASA grading
Patient-Specific Instrumentation Explanation: ***Complication of surgery***
- THORACOSCORE is a **risk prediction model** for thoracic surgery used to estimate the *probability of mortality and significant morbidity*, but it does not account for the complications of surgery itself as a component.
- The score uses **pre-operative patient characteristics** and co-morbidities to predict outcomes, not post-operative events.
*Performance status*
- **Performance status**, such as the **ECOG scale**, is a crucial component of THORACOSCORE, reflecting the patient's general health and functional capacity prior to surgery.
- A lower performance status (indicating poorer functional ability) increases the predicted risk in THORACOSCORE.
*Priority of surgery*
- The **priority of surgery** (e.g., elective, urgent, emergency) is an important factor in THORACOSCORE, as emergency procedures generally carry a higher risk.
- This variable helps to capture the urgency and associated physiological stress on the patient at the time of presentation for surgery.
*ASA grading*
- The **American Society of Anesthesiologists (ASA) physical status classification system** is a component of THORACOSCORE, assessing the patient's overall health status and anesthetic risk.
- A higher ASA grade (indicating more severe systemic disease) contributes to a higher predicted risk in the THORACOSCORE model.
Patient-Specific Instrumentation Indian Medical PG Question 4: In immediate denture, why is clear acrylic stent or surgical template given soon after extraction?
- A. For trimming jagged bone margins (Correct Answer)
- B. Condition tissues
- C. For impression taking
- D. Contain socket healing substances
Patient-Specific Instrumentation Explanation: ***For trimming jagged bone margins***
- A clear acrylic stent aids in visualizing the underlying bone during surgery, allowing the clinician to **trim any sharp or jagged bone margins** post-extraction.
- This process is crucial for creating a smooth, even ridge that will properly support the immediate denture and prevent **pressure sores** or discomfort.
*Condition tissues*
- Tissue conditioning is typically performed with a soft reline material placed inside an existing denture or a temporary base to improve the health of abused oral tissues.
- A clear acrylic stent is a rigid device used during surgery and does not possess properties to condition tissues.
*For impression taking*
- Impressions for immediate dentures are taken *before* extractions to capture the existing dentition and soft tissue contours, which are then used to fabricate the denture.
- A clear acrylic stent is used *during* the surgical phase, after extractions, to guide bone reshaping, not for taking an impression.
*Contain socket healing substances*
- While some materials can be placed in extraction sockets to aid healing, the primary purpose of a clear acrylic surgical template is mechanical guidance for bone reduction.
- It itself does not typically contain or deliver healing substances to the socket.
Patient-Specific Instrumentation Indian Medical PG Question 5: Most reliable method to identify putrefied bodies with metallic implants?
- A. Serial number matching (Correct Answer)
- B. X-ray superimposition
- C. Dental comparison
- D. DNA profiling
Patient-Specific Instrumentation Explanation: ***Serial number matching***
- Metallic implants, such as orthopedic prostheses or pacemakers, often carry **unique serial numbers** that can be traced back to the manufacturer and patient records.
- This method is highly reliable even in cases of severe **putrefaction** or fragmentation, as the implant itself is resistant to decomposition.
*X-ray superimposition*
- This method involves superimposing antemortem (before death) and postmortem (after death) X-rays to look for matching anatomical features.
- While useful for bone and tooth identification, it is less reliable for specific identification with metallic implants compared to direct serial number matching, especially if the antemortem X-rays predate the implant.
*Dental comparison*
- **Dental comparison** involves comparing antemortem dental records (X-rays, charts) with postmortem dental findings.
- This method is very effective for identification in general, but it does not directly utilize the metallic implant for identification and thus is not the *most reliable* method when an implant is present.
*DNA profiling*
- **DNA profiling** is highly effective for identification using biological samples, but it relies on obtaining viable DNA.
- In cases of severe putrefaction, obtaining **high-quality, uncontaminated DNA** suitable for profiling can be very challenging or impossible from the remains themselves.
Patient-Specific Instrumentation Indian Medical PG Question 6: Which prosthesis is shown below in the X-ray?
- A. Articular resurfacing
- B. Thompson prosthesis
- C. Austin Moore's prosthesis (Correct Answer)
- D. Birmingham hip replacement
Patient-Specific Instrumentation Explanation: ***Austin Moore's prosthesis***
- The image clearly shows a **femoral stem with a long intramedullary component** and an **integrated prosthetic head** that articulates directly with the native acetabulum. This is characteristic of a hemiarthroplasty design, specifically resembling an Austin Moore prosthesis.
- This type of prosthesis is commonly used for **femoral neck fractures** in older patients, replacing only the femoral head and neck rather than the entire hip joint.
*Articular resurfacing*
- **Articular resurfacing** involves capping the femoral head and lining the acetabulum with metallic implants, preserving more bone than a traditional total hip replacement.
- The X-ray image does not show a cap on the femoral head or a separate acetabular component, which are features of resurfacing.
*Thompson prosthesis*
- The **Thompson prosthesis** is another type of hemiarthroplasty, but it typically has a **shorter, bulkier femoral stem** and a **relatively smaller head** compared to the Austin Moore prosthesis shown.
- While both Thompson and Austin Moore prostheses are hemiarthroplasties, the specific shape and length of the stem in the X-ray are more consistent with an Austin Moore design.
*Birmingham hip replacement*
- The **Birmingham hip replacement** is a type of **hip resurfacing arthroplasty**, which, as explained earlier, involves capping the femoral head and is not depicted in this image.
- It maintains more of the patient's original bone structure compared to conventional total hip replacement but still requires both femoral and acetabular components.
Patient-Specific Instrumentation Indian Medical PG Question 7: 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
Patient-Specific Instrumentation 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.
Patient-Specific Instrumentation Indian Medical PG Question 8: What is the most effective management strategy for hemarthrosis?
- A. Immobilization with a P.O.P. cast
- B. Application of a compression bandage
- C. Needle aspiration to remove excess blood (Correct Answer)
- D. All of the options
Patient-Specific Instrumentation Explanation: ***Needle aspiration to remove excess blood***
- **Aspirating the blood** from the joint effectively reduces intra-articular pressure, pain, and inflammation.
- This procedure also helps prevent **synovial hypertrophy** and **cartilage damage** caused by the presence of blood in the joint.
*Application of a compression bandage*
- While helpful for reducing swelling and providing support, a **compression bandage alone** does not remove the accumulated blood.
- It may alleviate some discomfort but does not address the underlying issue of **intra-articular blood accumulation**.
*Immobilization with a P.O.P. cast*
- **Immobilization** can help rest the joint and reduce pain, but it does not remove the blood from the joint space.
- Prolonged immobilization can lead to **joint stiffness** and **muscle atrophy**, which are undesirable outcomes.
*All of the options*
- While compression and immobilization can be supportive measures, they are not the **most effective primary strategy** for managing hemarthrosis.
- The direct removal of blood via **aspiration** is crucial for alleviating pressure and preventing long-term joint damage.
Patient-Specific Instrumentation Indian Medical PG Question 9: In which of the following surgeries is monopolar cautery preferred over bipolar cautery?
- A. Surgery around Penis
- B. Surgery of the Hip (Correct Answer)
- C. Hand Surgery
- D. Surgery around the face
Patient-Specific Instrumentation Explanation: ***Surgery of the Hip***
- **Monopolar cautery** is preferred in surgeries like hip surgery where a larger area needs to be coagulated, as it provides a wider field of effect and can be more efficient for **deep tissue coagulation**.
- Its mechanism relies on the current passing through the patient to a large **dispersive electrode (grounding pad)**, making it suitable for extensive tissue work.
*Hand Surgery*
- In **hand surgery**, delicate structures like nerves and tendons are abundant, making **bipolar cautery** safer due to its localized current flow and reduced risk of inadvertent thermal spread.
- **Bipolar cautery** limits the current to a small area between the two prongs of the instrument, thus minimizing damage to surrounding tissues.
*Surgery around Penis*
- **Bipolar cautery** is generally preferred in sensitive areas like the penis, due to its localized effect and reduced risk of thermal injury to adjacent delicate structures.
- The avoidance of current passing through the body to a grounding pad in **bipolar modality** is especially important in areas with potential for nerve damage or scarring.
*Surgery around the face*
- Surgically around the face often involves delicate tissues and structures where **bipolar cautery** is favored to prevent widespread thermal damage and minimize scarring or nerve injury.
- The confined current path of **bipolar cautery** makes it ideal for precision work in cosmetic or reconstructive facial surgery.
Patient-Specific Instrumentation Indian Medical PG Question 10: Blood loss during major surgery is best estimated by:
- A. Transesophageal USG Doppler
- B. Visual assessment
- C. Suction bottles (Correct Answer)
- D. Cardiac output by thermodilution
Patient-Specific Instrumentation Explanation: ***Suction bottles***
- Measuring the volume of fluid collected in **suction bottles** (after subtracting irrigating fluid) provides a direct and quantifiable estimate of blood loss.
- This method is widely used in surgery due to its **simplicity and relative accuracy** for assessing blood collected from the surgical field.
*Transesophageal USG Doppler*
- This technique primarily assesses **cardiac function** and **blood flow dynamics**, not directly quantifying blood loss.
- While it can indicate hypovolemia, it doesn't provide a precise measurement of the volume of blood lost.
*Visual assessment*
- **Visual estimation** of blood loss by surgical staff is notoriously inaccurate and can lead to significant underestimation or overestimation.
- It is highly subjective and depends on factors like lighting, the color of the blood-soaked materials, and individual experience.
*Cardiac output by thermodilution*
- **Thermodilution** is used to measure cardiac output, which can reflect hemodynamic status and help guide fluid resuscitation.
- It does not directly quantify the amount of blood lost but rather assesses the **body's response** to blood loss.
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