Prosthetic Fitting and Training — MCQs

10 questions

Amputation is often not required in:

Following a femoral shaft fracture, your consultant asks you to provide tibia traction. Which of the following will you request from the nurse? 1. Thomas splint 2. K-wire 3. Steinmann pin 4. Denham's pin 5. Bohler's stirrup 6. Bohler Braun splint

A pole vaulter had a fall during pole vaulting and had paralysis of the arm . Which of the following investigations gives the best recovery prognosis -

Patellar tendon-bearing P.O.P. cast is indicated in the following fracture:

Which prosthesis is shown below in the X-ray?

In below-elbow amputation the length of stump should be

What is the most effective management strategy for hemarthrosis?

All of the following statements about SACH feet are true, except:

Which of the following is the metal cofactor of the enzyme ALA dehydratase?

Q10

Which of the following flaps is known for having a fixed pivot point at the base?

Prosthetic Fitting and Training Indian Medical PG Practice Questions and MCQs

Question 1: Amputation is often not required in:

A. Buerger's
B. Chronic osteomyelitis (Correct Answer)
C. Diabetic gangrene
D. Gas gangrene

Explanation: ***Chronic osteomyelitis*** - While chronic osteomyelitis can be severe, advancements in **antibiotic therapy**, **surgical debridement**, and **reconstructive procedures** often allow for limb salvage. - The goal of treatment is to eradicate infection and preserve function, making amputation a last resort when other methods fail to control infection or restore viability. *Buerger's* - **Buerger's disease** (thromboangiitis obliterans) is characterized by inflammation and thrombosis of small and medium-sized arteries and veins, primarily in the limbs, leading to severe ischemia and gangrene. - Due to progressive vascular damage and frequent lack of effective medical treatment for advanced stages, **amputation is often required** to remove necrotic tissue and manage intractable pain. *diabetic gangrene* - **Diabetic gangrene** results from a combination of **peripheral neuropathy**, **peripheral arterial disease**, and **infection**, leading to tissue death, particularly in the feet. - The compromised blood supply and impaired wound healing in diabetic patients make these lesions prone to rapid progression and severe infection, with **amputation frequently necessary** to prevent systemic sepsis and death. *Gas gangrene* - **Gas gangrene** is a rapidly progressive and life-threatening infection caused by *Clostridium* species, which produce toxins and gas within tissues. - Due to its aggressive and destructive nature, requiring immediate and extensive surgical debridement often involving **amputation of the affected limb** to remove all infected tissue and prevent widespread systemic toxicity.

Question 2: Following a femoral shaft fracture, your consultant asks you to provide tibia traction. Which of the following will you request from the nurse? 1. Thomas splint 2. K-wire 3. Steinmann pin 4. Denham's pin 5. Bohler's stirrup 6. Bohler Braun splint

A. $1,2,3,4,5,6$
B. $3,5,6$ (Correct Answer)
C. $3,4,5$
D. $1,2,4$

Explanation: ***3,5,6*** - For **tibia traction** in a femoral shaft fracture, you would need a **Steinmann pin** for skeletal traction, a **Bohler's stirrup** to apply the traction force, and a **Bohler-Braun splint** to support the limb. - The **Steinmann pin** is inserted into the proximal tibia, the **Bohler's stirrup** attaches to the pin, and the **Bohler-Braun splint** provides a fixed structure for the traction system. *1,2,3,4,5,6* - This option incorrectly includes items not specifically used for applying **tibia traction** (e.g., K-wire is for internal fixation, Thomas splint is for early femur fracture management but not specifically for tibia traction application). - While some components might be used in general fracture management, not all are directly involved in setting up tibia traction as requested. *3,4,5* - This option correctly includes the **Steinmann pin** and **Bohler's stirrup** but incorrectly replaces the **Bohler-Braun splint** with a **Denham's pin**. - A **Denham's pin** is an alternative to a Steinmann pin for skeletal traction, but a **Bohler-Braun splint** is crucial for supporting the limb in this setup, which is missing here. *1,2,4* - This option includes a **Thomas splint** (used for femur fracture support, not tibia traction application), a **K-wire** (used for internal fixation, not traction), and a **Denham's pin** (an alternative to Steinmann pin, but lacks the necessary support and traction application equipment). - These items are not suitable for setting up comprehensive **tibia traction** for a femoral shaft fracture.

Question 3: A pole vaulter had a fall during pole vaulting and had paralysis of the arm . Which of the following investigations gives the best recovery prognosis -

A. Electromyography (Correct Answer)
B. Strength Duration Curve
C. Creatine phosphokinase levels
D. Muscle biopsy

Explanation: Electromyography - **Electromyography (EMG)** can help assess the extent of nerve damage and reinnervation, providing insights into the potential for recovery [1]. - The presence of **spontaneous activity** (fibrillations, positive sharp waves) indicates denervation, while the appearance of **motor unit action potentials (MUAPs)** suggests reinnervation [1]. *Creatine phosphokinase levels* - **Creatine phosphokinase (CPK)** levels primarily indicate **muscle damage**, not the extent of nerve injury or recovery potential. - While muscle damage can occur with nerve injury, CPK does not provide specific prognostic information for nerve regeneration. *Strength Duration Curve* - The **strength duration curve** assesses the excitability of a nerve or muscle to electrical stimulation. - While it can differentiate between **nerve and muscle damage**, it provides less comprehensive prognostic information compared to EMG regarding the status of nerve regeneration. *Muscle biopsy* - A **muscle biopsy** would directly evaluate muscle pathology, such as atrophy or regeneration. - However, it is an **invasive procedure** and provides less direct information about nerve recovery compared to EMG, which directly assesses nerve and muscle electrical activity.

Question 4: Patellar tendon-bearing P.O.P. cast is indicated in the following fracture:

A. Fracture of the tibia (Correct Answer)
B. Fracture of the patella
C. Fracture of the femur
D. Fracture of the medial malleolus

Explanation: ***Fracture of the tibia*** - A **patellar tendon-bearing (PTB) cast** is specifically designed to bypass the knee joint and transfer weight from the patellar tendon to the cast, offloading the tibia. - This design is particularly useful for **stable, distal tibia fractures** where partial weight-bearing is desired to promote healing. *Fracture of the patella* - A PTB cast would place direct pressure on the **patella**, which is contraindicated in a patellar fracture. - Patellar fractures often require a **cylinder cast** or surgical fixation to immobilize the knee. *Fracture of the femur* - Femoral fractures are typically **more proximal** and require **traction**, **internal fixation**, or a **spica cast** for stabilization. - A PTB cast would not provide adequate immobilization or weight-bearing relief for a femoral fracture due to its design. *Fracture of the medial malleolus* - Medial malleolus fractures involve the **ankle joint**, which is distal to the area covered by a PTB cast. - These fractures typically require a **short leg cast** or surgical repair, focusing on ankle stabilization.

Question 5: 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

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.

Question 6: In below-elbow amputation the length of stump should be

A. 15 - 20 cm (Correct Answer)
B. 5 - 10 cm
C. 20 - 25 cm
D. 10-15 cm

Explanation: ***15 - 20 cm*** - For a **below-elbow amputation** to be functional, the **stump length** should be approximately **15 to 20 cm** from the olecranon to allow for optimal prosthetic fitting and control. - This length provides sufficient leverage and preserves enough forearm musculature for effective **prosthetic operation**. *5 - 10 cm* - A stump length of **5-10 cm** from the olecranon would be considered too short for a below-elbow amputation, making it difficult to achieve **adequate prosthetic suspension** and control of the artificial limb. - Such a short stump might be classified as a **very short below-elbow amputation**, which often requires specialized prosthetic designs and can limit functionality. *20 - 25 cm* - A stump length of **20-25 cm** from the olecranon would be considered too long for a below-elbow amputation, encroaching on the wrist and hand area. - An excessively long stump can make it challenging to fit a standard **transradial prosthesis** comfortably and effectively, and might even be classified as a **wrist disarticulation** if extending too far distally. *10 -15 cm* - While **10-15 cm** from the olecranon can sometimes be functional, it is often considered on the shorter end of the ideal range for a below-elbow amputation, potentially limiting the effectiveness of certain **prosthetic designs** and control mechanisms. - A stump in this range might work, but the **15-20 cm range** generally offers superior functional outcomes and easier prosthetic fitting.

Question 7: 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

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.

Question 8: All of the following statements about SACH feet are true, except:

A. May wear out with time
B. 'SACH' stands for 'Solid Ankle Cushioned Heel'
C. Forms the base of a lower limb prosthesis
D. Wooden keel absorbs the impact of heel strike (Correct Answer)

Explanation: ***Wooden keel absorbs the impact of heel strike*** - This statement is incorrect because SACH feet do not have a **wooden keel** for shock absorption. - Instead, the **cushioned heel** itself absorbs the impact of heel strike. *May wear out with time* - **SACH feet**, like all prosthetic components, are subject to **wear and tear** from repeated use and environmental factors. - The materials used, such as rubber and foam, can degrade over time, necessitating replacement. *'SACH' stands for 'Solid Ankle Cushioned Heel'* - The acronym **SACH** accurately describes the design of this prosthetic foot. - It features a **solid ankle** component and a **cushioned heel** to provide shock absorption during gait. *Forms the base of a lower limb prosthesis* - The **SACH foot** is a fundamental component of many lower limb prostheses, regardless of the amputation level. - It provides the essential interface with the ground, enabling basic ambulation and stability for the user.

Question 9: Which of the following is the metal cofactor of the enzyme ALA dehydratase?

A. Magnesium
B. Zinc (Correct Answer)
C. Lead
D. Copper

Explanation: ***Zinc*** - **Zinc** acts as a crucial metal ion cofactor for **ALA dehydratase**, also known as **porphobilinogen synthase**. - It plays a vital role in the enzyme's catalytic activity, facilitating the **condensation of two molecules of aminolevulinate (ALA)** to form porphobilinogen. *Copper* - **Copper** is a cofactor for several enzymes, including **cytochrome c oxidase** and **superoxide dismutase**, but it is not the prosthetic group for ALA dehydratase. - While essential for various biological processes, its role does not extend to the direct catalysis of **heme synthesis** at the ALA dehydratase step. *Lead* - **Lead** is a well-known inhibitor of **ALA dehydratase**, not a prosthetic group. - The binding of lead to the enzyme's active site displaces essential cofactors like zinc, leading to the accumulation of **ALA** and causing **lead poisoning**. *Magnesium* - **Magnesium** is an important cofactor for many enzymes involved in **ATP hydrolysis**, **DNA replication**, and **RNA synthesis**. - However, it does not function as the prosthetic group for **ALA dehydratase** in the heme biosynthetic pathway.

Question 10: Which of the following flaps is known for having a fixed pivot point at the base?

A. Interpolation flap
B. Rotation flap (Correct Answer)
C. Advancement flap
D. Transposition flap

Explanation: ***Rotation flap*** - The **rotation flap** has a **fixed pivot point** at its base and rotates around this point in an arc to cover the adjacent defect. - The flap moves through a rotational movement, maintaining its blood supply through the base, which acts as the pivot. - Commonly used in scalp reconstruction, cheek defects, and trunk defects where rotational movement can close the defect. *Advancement flap* - The **advancement flap** moves forward in a **linear sliding motion** without rotation. - It does not have a fixed pivot point; instead, it advances directly into the defect. - Examples include V-Y advancement and bipedicle advancement flaps. *Transposition flap* - The **transposition flap** moves laterally over intervening normal tissue to reach the defect. - While it rotates, it does not have the same fixed pivot point characteristic as a rotation flap. - Examples include rhomboid flap and bilobed flap. *Interpolation flap* - The **interpolation flap** is transferred over or under intervening tissue, requiring a second stage to divide the pedicle. - It does not have a fixed pivot point at the base in the same manner as rotation flaps. - Examples include forehead flap for nasal reconstruction and cross-finger flap.

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