Plastic and Reconstructive Surgery Practice Questions

Q: All of the following are skin substitutes except?

Duoderm. ### Explanation The core concept in this question is distinguishing between **Skin Substitutes** (which replace the function/structure of the dermis or epidermis) and **Wound Dressings** (which merely provide a protective environment for healing). **1. Why Duoderm is the correct answer:** **Duoderm** is a **hydrocolloid dressing**, not a skin substitute. It consists of an adhesive layer containing gelatin, pectin, and carboxymethylcellulose. Its primary function is to maintain a moist wound environment, promote autolytic debridement, and provide a physical barrier against bacteria. It does not contain biological scaffolds or cellular components that integrate into the wound bed. **2. Analysis of Incorrect Options (Skin Substitutes):** * **Integra:** A **bilayered synthetic skin substitute**. It consists of a "neodermis" (bovine collagen and glycosaminoglycans) and a temporary "epidermis" (silicone membrane). It is widely used in major burns to provide a scaffold for dermal regeneration. * **Alloderm:** An **acellular dermal matrix (ADM)** derived from processed human cadaveric skin. The cells are removed to prevent immunogenic rejection, leaving a regenerative collagen scaffold. * **Trancyte:** A **biosynthetic skin substitute** consisting of a nylon mesh coated with porcine collagen, seeded with neonatal human fibroblasts. It is commonly used for partial-thickness burns. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Autograft remains the gold standard for permanent wound closure. * **Biobrane:** Another high-yield biosynthetic dressing (silicone membrane + nylon mesh + porcine collagen). * **Apligraf:** A composite skin substitute containing both living dermis (fibroblasts) and epidermis (keratinocytes). * **Cultured Epithelial Autografts (CEA):** Used when donor sites are limited; involves growing a patient's own cells in a lab.

Q: According to Veau's classification system of clefts, what group describes defects involving the soft palate up to the alveolus and usually involving the lip?

Group C. **Explanation:** Veau’s classification (1931) is a classic system used to categorize cleft lip and palate based on the anatomical extent of the defect. * **Why Group C is correct:** **Group C** involves a **complete unilateral cleft** extending from the soft palate, through the hard palate and the alveolar ridge, usually involving the lip on one side. It represents a defect of both the primary and secondary palate. **Analysis of Incorrect Options:** * **Group A:** Describes a cleft involving only the **soft palate**. * **Group B:** Describes a cleft involving both the **soft and hard palate** (up to the incisive foramen), but the alveolar ridge remains intact. * **Group C:** (Correct) Complete unilateral cleft (Soft palate + Hard palate + Alveolus + Lip). * **Group D:** Describes a **complete bilateral cleft** involving the soft palate, hard palate, and the alveolar ridge on both sides. **High-Yield Clinical Pearls for NEET-PG:** * **Incisive Foramen:** This is the key anatomical landmark. Defects posterior to it involve the secondary palate; defects anterior to it involve the primary palate. * **Kernahan’s Striped Y Classification:** A more modern and widely used system that provides a graphic representation of the cleft. * **Rule of 10s (Millard):** Criteria for cleft lip repair: 10 weeks of age, 10 lbs weight, and 10 g/dL hemoglobin. * **Surgical Timing:** Cleft lip is typically repaired at **3–6 months**, while cleft palate is repaired at **9–18 months** (to allow for speech development but minimize maxillary growth inhibition).

Q: What is a Wolf's graft?

Full thickness skin graft. **Explanation:** A **Wolfe’s graft** (also known as a Wolfe-Krause graft) is a **Full-Thickness Skin Graft (FTSG)**. It consists of the entire epidermis and the complete thickness of the dermis. Unlike partial-thickness grafts, the subcutaneous fat is meticulously trimmed away from the undersurface to ensure successful revascularization (plasmatic imbibition and inosculation). **Why Option A is correct:** Wolfe’s grafts are preferred for small, cosmetically sensitive areas (like the face, eyelids, or fingers) because they undergo **minimal secondary contraction**, provide better color and texture match, and are more durable than partial-thickness grafts. **Why other options are incorrect:** * **Option B:** A partial-thickness (split-thickness) skin graft is known as a **Thiersch graft**. It includes the epidermis and a variable portion of the dermis. * **Option C:** A rotational flap is a type of local flap that moves tissue around a pivot point; it is not a graft as it maintains its own blood supply. * **Option D:** A vascularized fibular graft is a composite free flap used for mandibular reconstruction, involving bone and its pedicle (peroneal artery). **High-Yield Clinical Pearls for NEET-PG:** * **Primary Contraction:** Higher in FTSG (Wolfe’s) due to more elastin fibers in the dermis. * **Secondary Contraction:** Higher in STSG (Thiersch); FTSG shows minimal secondary shrinkage. * **Donor Site:** Must be closed primarily (e.g., post-auricular, supraclavicular, or groin) because no dermal elements remain for spontaneous healing. * **Graft Take:** FTSG has a higher metabolic demand and is more likely to fail than STSG if the wound bed is suboptimal.

Q: What should be the thickness of a split-thickness skin graft?

0.3-0.5 mm. A **Split-Thickness Skin Graft (STSG)** consists of the entire epidermis and a variable portion of the underlying dermis. In clinical practice, STSGs are categorized based on their thickness: * **Thin (Thiersch-Ollier):** 0.12–0.3 mm (0.005–0.012 inches) * **Intermediate (Medium):** 0.3–0.45 mm (0.012–0.018 inches) * **Thick:** 0.45–0.75 mm (0.018–0.030 inches) **Option A (0.3-0.5 mm)** is the correct answer as it represents the standard range for an **intermediate-thickness STSG**, which is the most commonly utilized graft in general surgery. It strikes the best balance between "graft take" (revascularization) and durability. **Why the other options are incorrect:** * **Option B (0.5-0.7 mm):** This range represents a very thick STSG or a "near-full thickness" graft. While more durable, these have a higher metabolic demand and a lower success rate of "take" on poorly vascularized beds. * **Options C & D (1-1.25 mm):** These values exceed the typical thickness of human skin in most donor areas. A **Full-Thickness Skin Graft (FTSG)**, which includes the entire dermis, usually ranges from 0.8 mm to 1.1 mm depending on the anatomical site. **High-Yield Clinical Pearls for NEET-PG:** 1. **Graft Take:** The thinner the graft, the faster the "take" (via plasmatic imbibition and inosculation) because it has lower metabolic requirements. 2. **Contracture:** Thin STSGs undergo the most **secondary contraction** (shrinkage after healing), whereas FTSGs undergo the most **primary contraction** (immediate recoil after harvesting). 3. **Donor Site:** The donor site of an STSG heals by **re-epithelialization** from skin appendages (hair follicles, sweat glands) left in the dermis. FTSG donor sites must be closed primarily. 4. **Instrument:** A **Humby’s knife** or a **Dermatome** is used to harvest STSGs.

Q: Who proposed the stripped Y classification of clefts?

Kernahan. **Explanation:** The classification of cleft lip and palate is a high-yield topic in plastic surgery. The correct answer is **Kernahan**, who, along with Stark, introduced the **"Stripped Y" classification** in 1958 (later modified by Kernahan in 1971). **Why Kernahan is Correct:** The Stripped Y classification is a symbolic diagram used to record the location and severity of clefts. The **incisive foramen** serves as the central anatomical landmark. * The upper limbs of the 'Y' represent the lip and alveolus (divided into three sections each). * The vertical stem represents the hard and soft palate. * Sections are shaded to indicate the extent of the cleft, providing a visual shorthand for clinical documentation. **Analysis of Incorrect Options:** * **Veau (A):** Proposed one of the earliest clinical classifications (Groups I-IV) based on the involvement of the soft palate, hard palate, and alveolar ridge, but did not use the "Y" diagram. * **Davis and Ritchie (C):** Classified clefts based on their position relative to the alveolar process (Pre-alveolar, Post-alveolar, and Alveolar). * **Tessier (D):** Famous for the classification of **craniofacial clefts** (numbered 0 to 14) based on their relationship to the orbit and midline, rather than simple cleft lip/palate. **Clinical Pearls for NEET-PG:** * **Incisive Foramen:** The embryological dividing point between the primary palate (anterior) and secondary palate (posterior). * **Rule of 10s (Millard):** Criteria for cleft lip repair—10 weeks old, 10 lbs weight, 10 g/dL Hemoglobin. * **LAHSAL Classification:** A common alphanumeric modification of the Y-system used internationally.

Q: Which of the following is NOT an advantage of a split-thickness skin graft?

Absence of contracture. To understand this question, one must differentiate between **Split-Thickness Skin Grafts (STSG)** and **Full-Thickness Skin Grafts (FTSG)** based on their composition and clinical behavior. ### 1. Why "Absence of contracture" is the correct answer (The Disadvantage) The correct answer is **A** because STSGs are notorious for **secondary contraction**. * **Mechanism:** Secondary contraction is the shrinkage of a healed graft over time, primarily caused by myofibroblasts. The degree of contraction is inversely proportional to the amount of dermis included in the graft. * Since STSGs contain only a portion of the dermis, they undergo significant secondary contraction (up to 40-60%). In contrast, FTSGs, which contain the entire dermis, show minimal secondary contraction. ### 2. Analysis of Incorrect Options (Advantages of STSG) * **B. Wide area of recipient can be covered:** STSGs can be "meshed" (expanded), allowing a small donor site to cover a much larger recipient area. This is vital in major burn cases. * **C. Donor area heals spontaneously:** Because the deep adnexal structures (hair follicles, sweat glands) remain in the donor site, re-epithelialization occurs spontaneously within 7–14 days. * **D. Good graft take-up:** STSGs have lower metabolic demands and faster "inosculation" (vessel connection) than FTSGs. They "take" more easily, even in less-than-ideal wound beds. ### 3. High-Yield Clinical Pearls for NEET-PG * **Primary Contraction:** Immediate recoil due to elastin fibers. **FTSG > STSG.** * **Secondary Contraction:** Delayed shrinkage due to myofibroblasts. **STSG > FTSG.** * **Thiersch Graft:** Another name for a very thin STSG. * **Gold Standard for Face/Hands:** FTSG (Wolfe Graft) is preferred to avoid contracture and provide better cosmesis. * **Donor Site Healing:** STSGs heal by **re-epithelialization**; FTSG donor sites must be closed **primarily** or with another STSG.

Q: At what age is unilateral cleft lip best repaired?

5-6 months. The timing of cleft lip repair is a high-yield topic in NEET-PG. While traditional teaching often cited the "Rule of 10s," modern surgical practice has evolved toward slightly later repairs to optimize aesthetic outcomes and safety. ### **Why 5-6 Months is Correct** The current consensus for repairing a **unilateral cleft lip** is between **3 to 6 months** of age. In many standardized exams, including recent NEET-PG patterns, **5-6 months** is preferred because: 1. **Anatomical Maturity:** It allows the lip elements and landmarks to grow larger, facilitating a more precise surgical reconstruction (e.g., Millard’s rotation-advancement flap). 2. **Anesthetic Safety:** The infant is more robust, with a more mature respiratory system and better hemoglobin levels compared to the neonatal period. ### **Analysis of Incorrect Options** * **A (4-5 months):** While acceptable in some centers, it is less "ideal" than the 5-6 month window which allows for maximal growth before surgery. * **C & D (6-12 months):** These are considered **too late** for a primary lip repair. Delaying surgery beyond 6 months can lead to social stigma for the parents and may slightly interfere with early feeding patterns, though the primary concern is the missed opportunity for early anatomical correction. ### **High-Yield Clinical Pearls for NEET-PG** * **The Rule of 10s (Wilhelmsen and Musgrave):** Historically used to determine fitness for surgery: 10 weeks of age, 10 lbs weight, and 10 g/dL hemoglobin. * **Cleft Palate Repair:** Usually performed between **9 to 12 months** (must be completed before the child develops significant speech patterns). * **Most Common Type:** Left-sided unilateral cleft lip is more common than right-sided. * **Surgical Technique:** The **Millard Rotation-Advancement Flap** is the gold standard for unilateral repair; the **Tennison-Randall (Triangular flap)** is an alternative.

Q: What is the primary use of a dermatome?

To harvest or excise a skin graft from a donor site.. ### Explanation **Correct Answer: C. To harvest or excise a skin graft from a donor site.** A **dermatome** is a specialized surgical instrument designed to produce thin, uniform slices of skin from a donor area for use in reconstructive surgery. The primary mechanism involves an oscillating blade that can be adjusted to a specific depth, allowing the surgeon to harvest either **split-thickness skin grafts (STSG)** or **full-thickness skin grafts (FTSG)**. **Analysis of Options:** * **Option A (Incorrect):** While dermatomes have settings to *set* the desired thickness before cutting, they are not diagnostic tools used to *measure* the thickness of an existing graft. * **Option B (Incorrect):** The process of creating openings for expansion is called **meshing**, which is performed using a separate instrument known as a **Skin Graft Mesher**. Meshing increases the surface area of the graft and allows for the drainage of blood or serum (preventing hematoma/seroma). * **Option D (Incorrect):** Since the primary function is strictly the harvesting/excision of the graft, "All of the above" is incorrect. **Clinical Pearls for NEET-PG:** 1. **Types of Dermatomes:** * **Manual:** Humby’s knife, Blair’s knife, and Braithwaite’s knife (require manual skill to maintain uniform thickness). * **Electric/Air-powered:** Brown’s dermatome (most commonly used for consistent results). * **Drum-type:** Padgett’s dermatome (uses adhesive to lift skin; useful for irregular donor sites). 2. **STSG vs. FTSG:** Split-thickness grafts (harvested via dermatome) include the epidermis and a portion of the dermis, whereas Full-thickness grafts include the entire dermis. 3. **Donor Site Healing:** STSG donor sites heal by **re-epithelialization** from the remaining adnexal structures (hair follicles, sweat glands), while FTSG donor sites usually require primary closure.

Question 1

Which tissues are included in a myocutaneous flap?

Accepted Answer

Skin, muscle, and vascular pedicle

Answer

Muscle only

Answer

Muscle and vascular pedicle

Answer

Muscle and skin

Question 2

All of the following are skin substitutes except?

Accepted Answer

Duoderm

Answer

Integra

Answer

Alloderm

Answer

Trancyte

Question 3

According to Veau's classification system of clefts, what group describes defects involving the soft palate up to the alveolus and usually involving the lip?

Accepted Answer

Group C

Answer

Group A

Answer

Group B

Answer

Group D

Question 4

What is a Wolf's graft?

Accepted Answer

Full thickness skin graft

Answer

Partial thickness skin graft

Answer

Rotational flap

Answer

Vascularised fibular graft

Question 5

What should be the thickness of a split-thickness skin graft?

Accepted Answer

0.3-0.5 mm

Answer

0.5-0.7 mm

Answer

1-1.15 mm

Answer

1-1.25 mm

Question 6

Who proposed the stripped Y classification of clefts?

Accepted Answer

Kernahan

Answer

Veau

Answer

David and Ritchie

Answer

Tessier

Question 7

Which of the following is NOT an advantage of a split-thickness skin graft?

Accepted Answer

Absence of contracture

Answer

Wide area of recipient can be covered

Answer

Donor area heals spontaneously

Answer

Good graft take-up

Question 8

At what age is unilateral cleft lip best repaired?

Accepted Answer

5-6 months

Answer

4-5 months

Answer

6-9 months

Answer

9-12 months

Question 9

All of the following are true about carcinoma of the lip except?

Accepted Answer

If 1/3rd or less of the lip is involved, an Abbe-Estlander flap is used for reconstruction.

Answer

Non-healing ulcer or growth is the most common presentation.

Answer

The most common site is the vermillion of the lower lip.

Answer

The Abbe-Estlander flap is based on the superior labial artery.

Question 10

What is the primary use of a dermatome?

Accepted Answer

To harvest or excise a skin graft from a donor site.

Answer

To measure the thickness of a skin graft.

Answer

To create small openings in a skin graft for expansion (meshing).

Answer

All of the above.

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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