Plastic and Reconstructive Surgery Practice Questions

Q: What is true regarding Wolfe's graft?

Donor site is left open to granulate and contract. **Explanation:** A **Wolfe’s graft** is a **Full-Thickness Skin Graft (FTSG)**, consisting of the entire epidermis and the complete thickness of the dermis. **Why Option B is Correct:** Unlike Split-Thickness Skin Grafts (STSG), where the donor site retains adnexal structures (hair follicles, sweat glands) to allow for spontaneous re-epithelialization, a Wolfe’s graft removes the entire dermis. Consequently, the donor site **cannot regenerate on its own**. It must be managed by primary closure (suturing), a secondary skin graft, or, if small, **left open to heal by secondary intention (granulation and contraction)**. **Analysis of Incorrect Options:** * **A. Uptake of graft is easy:** Incorrect. Because FTSGs are thicker, they have higher metabolic demands. They require a more robust vascular bed for successful "take" (plasmatic imbibition and inosculation) compared to STSGs. * **C. Large grafts can be taken:** Incorrect. FTSGs are typically limited to small areas (e.g., face, hand) because the donor site defect is difficult to close if the graft is too large. * **D. Not useful for cosmetic surgeries:** Incorrect. Wolfe’s grafts are **highly preferred** for cosmetic areas (like the eyelid or nose) because they undergo minimal secondary contraction, maintain better color/texture match, and retain hair follicles. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Contraction:** Higher in Wolfe’s graft (due to more elastin in the dermis). * **Secondary Contraction:** Significantly lower in Wolfe’s graft (making it ideal for preventing ectropion or contractures over joints). * **Common Donor Sites:** Post-auricular area, supraclavicular fossa, and groin crease. * **Gold Standard for Face:** Wolfe’s graft is superior to STSG for facial reconstruction due to superior aesthetic outcomes.

Q: What type of knife is used for harvesting split-thickness skin grafts?

Humby's knife. **Explanation:** **Humby’s knife** (Option C) is the correct answer. It is a specialized surgical instrument designed specifically for harvesting **Split-Thickness Skin Grafts (STSG)**. The defining feature of Humby’s knife is an adjustable roller bar that allows the surgeon to calibrate the gap between the blade and the roller. This mechanism ensures a uniform thickness of the graft (usually containing the epidermis and a portion of the dermis) by preventing the blade from cutting too deep into the donor site. **Analysis of Incorrect Options:** * **Husson’s knife (A):** This is not a standard surgical instrument for skin grafting. It is likely a distractor or a misspelling of specialized orthopedic or ophthalmic tools. * **Bard Parker’s knife (B):** This refers to the standard surgical scalpel handle (e.g., BP handle No. 3 or 4). While a scalpel can be used for small "pinch grafts," it lacks the precision and roller mechanism required for harvesting large, uniform STSGs. * **Foley’s knife (D):** There is no standard "Foley’s knife" in surgery; Foley is famously associated with the indwelling urinary catheter. **High-Yield Clinical Pearls for NEET-PG:** * **Modifications:** The **Braithwaite** and **Cobbett** knives are common modifications of the Humby’s knife. * **Power Tools:** In modern practice, the **electric or air-powered dermatome** (e.g., Brown’s dermatome) is frequently used for more precise and rapid harvesting. * **Graft Thickness:** STSG donor sites heal by **re-epithelialization** from skin appendages (hair follicles, sebaceous glands) left in the dermis. * **Blades:** Humby’s knife typically uses a disposable **Watson blade**.

Q: What is the minimum age for cleft lip repair?

6 months. The correct answer is **6 months (Option A)**. ### **Explanation of the Correct Answer** In modern plastic surgery, the timing for cleft lip repair is guided by the **"Rule of 10s"** (Millard’s Rule), which ensures the infant is physiologically stable enough for general anesthesia and surgery. The rule states the child should be: 1. **10 weeks** of age. 2. **10 pounds** in weight. 3. **10 grams%** of Hemoglobin. 4. **WBC count < 10,000/mm³**. While the "Rule of 10s" allows surgery at ~3 months (10 weeks), many institutional protocols and standardized exams (including recent NEET-PG trends) consider **3 to 6 months** as the ideal window. Among the given options, **6 months** is the most appropriate minimum age that ensures the child has surpassed the neonatal period and achieved adequate weight for safe anesthesia. ### **Why Other Options are Incorrect** * **12 months (Option B):** This is the standard age for **Cleft Palate** repair (usually 6–12 months). Repairing the lip this late can lead to social stigma and minor feeding difficulties. * **2 years (Option C) & 5 years (Option D):** These are far too late. Delayed repair leads to poor mid-face development, speech articulation issues (if the palate is also involved), and psychological distress for the family. ### **High-Yield Clinical Pearls for NEET-PG** * **Cleft Lip Repair:** Most common technique is the **Millard Rotation-Advancement Flap**. * **Cleft Palate Repair:** Most common technique is the **Veau-Wardill-Kilner (V-Y pushback)** or **Bardach’s Two-Flap Palatoplasty**. * **Sequence of Management:** 1. Lip repair: 3–6 months. 2. Palate repair: 6–12 months. 3. Speech therapy: 4 years onwards. 4. Alveolar bone grafting: 7–11 years (Mixed dentition stage). 5. Rhinoplasty/Orthognathic surgery: After skeletal maturity (16–18 years).

Q: Sagittal split osteotomy was first advocated by whom?

Obwegesser. **Explanation:** The **Bilateral Sagittal Split Osteotomy (BSSO)** is a cornerstone procedure in orthognathic surgery used to correct mandibular deformities such as retrognathism (receding chin) or prognathism (protruding chin). * **Correct Answer (A) Obwegesser:** Hugo Obwegesser is widely regarded as the "father of modern orthognathic surgery." In **1955**, he first advocated and described the intraoral sagittal split osteotomy. His technique revolutionized the field by allowing the mandible to be moved forward or backward without the need for external skin incisions or bone grafts. **Analysis of Incorrect Options:** * **(B) Dalpont:** In 1961, Dalpont modified Obwegesser’s original technique by extending the buccal cortical bone cut further anteriorly into the body of the mandible. This modification increased the surface area for bone contact and healing. * **(C) Wundrer:** Known for the **Wunderer technique**, which is a specific type of anterior maxillary osteotomy used to correct maxillary protrusion, not the sagittal split of the mandible. * **(D) Moose:** In 1964, Moose introduced further refinements to the BSSO, specifically advocating for the use of power saws and modifying the medial horizontal cut to reduce the risk of nerve injury. **High-Yield Clinical Pearls for NEET-PG:** 1. **Indication:** BSSO is the gold standard for mandibular advancement and setback. 2. **Nerve at Risk:** The **Inferior Alveolar Nerve (IAN)** is the most commonly injured structure during this procedure, leading to lower lip paresthesia. 3. **Advantage:** Because the split occurs between the cortical plates, it provides a broad area of cancellous bone contact, promoting rapid primary bone healing. 4. **Fixation:** Modern BSSO typically utilizes **Rigid Internal Fixation (RIF)** with mini-plates or screws, often eliminating the need for prolonged intermaxillary fixation (wiring the jaws shut).

Q: Reconstruction of the tip of the nose after excision of basal cell carcinoma is best achieved by which method?

Bilobed flap. **Explanation:** Reconstruction of the nasal tip is surgically challenging due to the lack of laxity in the skin and the complex three-dimensional contour. **Why the Bilobed Flap is correct:** The **Bilobed flap** is the gold standard for small to medium-sized defects (0.5 cm to 1.5 cm) on the lower third of the nose (tip and alar sidewall). It is a **transposition flap** that allows for the movement of skin from areas of relative laxity (like the nasal bridge or sidewall) to the rigid nasal tip. By using two lobes, it distributes the tension over a wider area, preventing the "pin-cushioning" effect and minimizing alar rim distortion, which provides a superior aesthetic result compared to other methods. **Analysis of Incorrect Options:** * **Bipedicled flap:** These are generally used for larger defects or in areas like the eyelid or lip; they are bulky and not anatomically suited for the delicate contour of the nasal tip. * **Full thickness skin graft (FTSG):** While FTSG provides better color match than SSG, it often results in a "patch-like" appearance and contour depression because it lacks the subcutaneous thickness required for the nasal tip. * **Split skin graft (SSG):** This is the least preferred method for the face. It undergoes significant secondary contraction, has a poor color/texture match, and leads to a shiny, depressed scar. **Clinical Pearls for NEET-PG:** * **Defects 2 cm:** Forehead flap (Paramedian forehead flap) is the "Gold Standard" for large nasal defects. * **Donor site for Bilobed flap:** Usually the more mobile skin of the proximal nasal dorsum.

Q: What is the recommended length to width ratio for an elliptical incision?

3:1. ### Explanation The correct answer is **3:1**. **1. Why 3:1 is Correct:** An elliptical incision (also known as a fusiform incision) is the standard technique for excising skin lesions to allow for primary closure. The fundamental goal is to avoid **"dog-ear" deformities** (standing cone deformities) at the ends of the wound. * A **length-to-width ratio of 3:1** ensures that the apical angle at each end of the ellipse is approximately **30 degrees or less**. * This geometry allows the wound edges to be apposed smoothly without redundant tissue bunching up at the corners, resulting in a flat, linear scar. **2. Analysis of Incorrect Options:** * **4:1 (Option A):** While a 4:1 ratio provides an even flatter closure, it requires sacrificing a significant amount of healthy tissue and results in a much longer scar than necessary for most clinical scenarios. * **2:1 (Option B):** A 2:1 ratio results in an apical angle that is too obtuse. This leads to the formation of "dog-ears," where the skin puckers at the ends because the sides of the wound are too curved to lie flat. * **1:1 (Option D):** A 1:1 ratio describes a circle. Closing a circular defect directly results in significant puckering and tension, making it unsuitable for linear primary closure. **3. Clinical Pearls for NEET-PG:** * **Orientation:** Elliptical incisions should ideally be oriented parallel to **Langer’s lines** (Relaxed Skin Tension Lines - RSTL) to minimize tension and optimize scarring. * **Undermining:** To further reduce tension during closure, surgeons often "undermine" (separate the skin from underlying subcutaneous fat) for a distance roughly equal to the width of the defect. * **The 30-Degree Rule:** For a perfect closure, the angle at the apex of the ellipse should be kept under **30°**.

Q: What is the ideal angle for a Z-plasty?

60 degrees. **Explanation:** Z-plasty is a versatile transposition flap technique used in plastic surgery to increase the length of a scar (lengthening) and change its direction to align with relaxed skin tension lines (RSTL). **1. Why 60 degrees is the Correct Answer:** The gain in length in a Z-plasty is mathematically dependent on the angle of the flaps. A **60-degree angle** is considered the "ideal" or "standard" angle because it provides a significant and predictable **75% increase in length** while remaining technically feasible. At this angle, the flaps are easy to transpose without excessive tension or risk of tip necrosis, providing the best balance between gain in length and tissue viability. **2. Analysis of Incorrect Options:** * **30 degrees (Option A):** While smaller angles are easier to transpose, they provide a minimal length increase (only about 25%). They are rarely used unless tissue laxity is extremely limited. * **45 degrees (Option B):** This provides a moderate length increase (approximately 50%). It is used when 60 degrees would create too much tension, but it is not the "ideal" standard. * **90 degrees (Option D):** Theoretically, larger angles provide more length (a 90-degree angle would yield a 120% increase). However, in practice, 90-degree flaps are nearly impossible to transpose due to extreme tension and the resulting "dog-ear" deformity. **High-Yield Clinical Pearls for NEET-PG:** * **Theoretical Gain:** 30° = 25%; 45° = 50%; **60° = 75%**. * **Limiting Factor:** The gain in length is always at the expense of **lateral tension** (narrowing of the width). * **Four-flap Z-plasty (Limberg):** Used for contractures in areas with limited laxity (e.g., web spaces). * **Multiple Z-plasties:** Preferred over one large Z-plasty for long scars to distribute tension and produce a more aesthetic result.

Question 1

What is true regarding Wolfe's graft?

Accepted Answer

Donor site is left open to granulate and contract

Answer

Uptake of graft is easy

Answer

Large grafts can be taken

Answer

Not useful for cosmetic surgeries

Question 2

In the temporal approach for reduction of a zygomatic arch fracture, the Boies zygomatic elevator is placed between which layers?

Accepted Answer

The temporal fascia and the temporalis muscle

Answer

Superficial fascia and the temporal fascia

Answer

The temporal bone and the temporalis muscle

Answer

The skin and superficial fascia

Question 3

What type of knife is used for harvesting split-thickness skin grafts?

Accepted Answer

Humby's knife

Answer

Husson's knife

Answer

Bard Parker's knife

Answer

Foley's knife

Question 4

What is the minimum age for cleft lip repair?

Accepted Answer

6 months

Answer

12 months

Answer

2 years

Answer

5 years

Question 5

Sagittal split osteotomy was first advocated by whom?

Accepted Answer

Obwegesser

Answer

Dalpont

Answer

Wundrer

Answer

Moose

Question 6

Reconstruction of the tip of the nose after excision of basal cell carcinoma is best achieved by which method?

Accepted Answer

Bilobed flap

Answer

Bipedicled flap

Answer

Full thickness skin graft

Answer

Split skin graft

Question 7

All of the following nerves are commonly used for grafting except?

Accepted Answer

Musculocutaneous nerve

Answer

Medial antebrachial cutaneous nerve

Answer

Dorsal sensory branch of vagal nerve

Answer

Sural nerve

Question 8

What is the recommended length to width ratio for an elliptical incision?

Accepted Answer

3:1

Answer

4:1

Answer

2:1

Answer

1:1

Question 9

Inosculation refers to what process?

Accepted Answer

Alignment of donor and recipient capillaries

Answer

Growth of lymphatics into the graft

Answer

Growth of arteries into the graft

Answer

Diffusion of nutrients into the graft

Question 10

What is the ideal angle for a Z-plasty?

Accepted Answer

60 degrees

Answer

30 degrees

Answer

45 degrees

Answer

90 degrees

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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