Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery Indian Medical PG Practice Questions and MCQs

Question 81: Theirsch graft is also known as?

A. Full thickness graft
B. Partial thickness graft (Correct Answer)
C. Wolfe's graft
D. Plastic graft

Explanation: **Explanation:** Skin grafts are classified based on the thickness of the skin harvested. A **Thiersch graft** is another name for a **Thin Partial-Thickness Skin Graft (STSG)**. 1. **Why Option B is correct:** A Thiersch graft involves harvesting the entire epidermis and a very thin layer of the underlying dermis (usually the papillary dermis). Because it contains less dermal tissue, it has a higher "take" rate (easier revascularization) but is more prone to secondary contraction and provides less cosmetic/functional durability compared to thicker grafts. 2. **Why other options are incorrect:** * **Option A & C:** A **Full-thickness skin graft (FTSG)** is also known as a **Wolfe’s graft**. It includes the epidermis and the entire thickness of the dermis. These grafts have a lower "take" rate but offer superior cosmetic results and minimal secondary contraction. * **Option D:** "Plastic graft" is not a standard medical classification for skin grafting techniques. **High-Yield Clinical Pearls for NEET-PG:** * **Components:** STSG (Thiersch) = Epidermis + part of Dermis; FTSG (Wolfe) = Epidermis + entire Dermis. * **Donor Site Healing:** The donor site of a Thiersch graft heals spontaneously via **re-epithelialization** from skin appendages (hair follicles, sebaceous glands). The donor site of a Wolfe’s graft must be closed primarily or with another STSG. * **Contraction:** STSG has more **secondary contraction** (shrinking after healing), while FTSG has more **primary contraction** (immediate recoil upon harvesting due to elastin fibers). * **Instrument:** A **Humby’s knife** or a dermatome is typically used to harvest Thiersch grafts.

Question 82: At what age is a cleft lip typically repaired?

A. 1 month
B. 6 months
C. 10 weeks (Correct Answer)
D. 1 year

Explanation: **Explanation:** The timing for cleft lip repair is traditionally guided by the **"Rule of Tens,"** established by Wilhelmmesen and Musgrave. This rule ensures the infant is physiologically mature enough to undergo general anesthesia and has sufficient tissue bulk for a meticulous surgical repair. **The Rule of Tens includes:** 1. **Age:** At least **10 weeks** (approx. 3 months). 2. **Weight:** At least **10 pounds** (approx. 4.5 kg). 3. **Hemoglobin:** At least **10 g/dL**. 4. **WBC Count:** Less than **10,000/mm³** (to ensure no active infection). **Analysis of Options:** * **A. 1 month:** Too early; the infant’s metabolic systems are immature, and the risk of anesthesia is higher. Tissue landmarks are also less defined. * **B. 6 months:** While surgery can be performed at this age, it is unnecessarily late. Repairing at 10 weeks allows for better parental bonding and earlier functional improvement. * **D. 1 year:** This is the typical age for **Cleft Palate** repair (usually 9–12 months), not cleft lip. Palate repair is delayed to allow for maxillary growth but performed before significant speech development begins. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type:** Left-sided unilateral cleft lip is the most common presentation. * **Surgical Technique:** The most widely used procedure for unilateral cleft lip is the **Millard Rotation-Advancement Flap**. * **Cleft Palate Timing:** Repaired at 9–12 months to prevent speech defects (velopharyngeal insufficiency). * **Sequence of Management:** Lip repair (3 months) → Palate repair (9–12 months) → Alveolar bone grafting (9–11 years, during mixed dentition).

Question 83: In cleft lip operations, when are all the stitches typically removed?

A. 2nd day
B. 4th day (Correct Answer)
C. 10th day
D. 14th day

Explanation: **Explanation:** The primary goal of suture removal in facial plastic surgery, particularly in pediatric cases like cleft lip repair, is to balance **wound tensile strength** against the risk of **permanent suture marks** (railroad scarring). **1. Why the 4th day is correct:** The facial skin has an excellent blood supply, which promotes rapid healing. In cleft lip surgery (e.g., Millard’s rotation-advancement flap), skin sutures are typically removed between the **3rd and 5th postoperative days** (average 4th day). Removing them early prevents the epithelialization of the suture tracts, which causes permanent scarring. By day 4, the wound has sufficient initial fibrin glue and early collagen deposition to remain apposed, provided the deeper muscle layers (Orbicularis oris) were repaired securely. **2. Analysis of Incorrect Options:** * **2nd day (Option A):** This is too early. The wound has not gained enough tensile strength to withstand the tension of facial expressions or crying, leading to a high risk of wound dehiscence. * **10th and 14th days (Options C & D):** These are standard timings for sutures on the trunk or limbs where healing is slower. On the face, leaving sutures for more than 7 days leads to "cross-hatching" or "railroad track" scars, which are aesthetically unacceptable in reconstructive surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s:** Criteria for cleft lip surgery: 10 weeks of age, 10 lbs weight, and 10 g/dL Hemoglobin. * **Muscle Repair:** The most critical step in cleft lip repair is the reconstruction of the **Orbicularis oris** muscle to restore function and philtrum shape. * **Suture Material:** Usually, 6-0 or 7-0 non-absorbable monofilament (like Prolene) is used for the skin and removed early, or fast-absorbing gut is used to avoid the trauma of suture removal in infants.

Question 84: A full thickness graft can be obtained from all of the following sites, EXCEPT:

A. Eyelids
B. Knee (Correct Answer)
C. Postauricular skin
D. Supraclavicular skin

Explanation: **Explanation:** The core principle of selecting a donor site for a **Full Thickness Skin Graft (FTSG)** is to choose areas with thin, mobile skin and minimal subcutaneous fat, which allows for better "take" (revascularization) and primary closure of the donor site. **Why "Knee" is the correct answer:** The skin over the knee is thick, subjected to constant mechanical stress, and lacks the necessary laxity for primary closure after harvesting a full-thickness piece. Furthermore, the knee is a common site for **Split Thickness Skin Grafts (STSG)**, where only the epidermis and a portion of the dermis are harvested using a dermatome. FTSGs are rarely, if ever, taken from weight-bearing or high-friction joint surfaces like the knee. **Analysis of incorrect options:** * **Eyelids:** This is the thinnest skin in the body. It is an ideal donor site for FTSG when repairing defects in the contralateral eyelid or delicate facial areas. * **Postauricular skin:** This is the **most common** donor site for FTSGs used in facial reconstruction because the color match is excellent, the skin is thin, and the scar is hidden in the sulcus. * **Supraclavicular skin:** This site provides a large surface area of thin skin with a good color match for head and neck defects. **High-Yield Clinical Pearls for NEET-PG:** * **FTSG (Wolfe’s Graft):** Includes epidermis and the *entire* dermis. It undergoes less secondary contraction than STSG, making it superior for cosmetic areas. * **Primary Closure:** Unlike STSG donor sites (which heal by epithelialization), FTSG donor sites **must** be closed primarily with sutures. * **Common Donor Sites:** Postauricular (best for face), Supraclavicular, Inguinal crease (for large grafts), and Prepuce. * **Take of Graft:** FTSGs are more demanding; they require a well-vascularized bed and are more prone to failure than STSGs.

Question 85: Which of the following grafts is more resistant to infection and trauma?

A. Thiersch graft
B. Wolfe graft (Correct Answer)
C. Partial thickness graft
D. Both Partial thickness graft and Wolfe graft

Explanation: ### Explanation The correct answer is **Wolfe graft**, which is the clinical eponym for a **Full-Thickness Skin Graft (FTSG)**. **1. Why Wolfe Graft is the Correct Answer:** A Wolfe graft includes the entire epidermis and the complete thickness of the dermis. Because it retains the full dermal architecture, it is structurally more robust, thicker, and more durable than partial-thickness grafts. The presence of a complete dermal layer provides better protection against mechanical trauma and makes the graft more resistant to secondary breakdown and infection once it has successfully "taken." Furthermore, FTSGs undergo less secondary contraction and provide superior cosmetic results. **2. Why Other Options are Incorrect:** * **Thiersch Graft (Option A):** This is an eponym for a very thin **Split-Thickness Skin Graft (STSG)**. Because it contains only the epidermis and a minimal portion of the papillary dermis, it is fragile, prone to trauma, and undergoes significant secondary contraction. * **Partial Thickness Graft (Option C):** Also known as STSG, these grafts lack the full supportive structure of the dermis. While they have a higher "take" rate in poorly vascularized beds compared to FTSGs, they are significantly less resistant to long-term trauma and infection. * **Option D:** Incorrect because the physical properties of partial and full-thickness grafts are diametrically opposite regarding durability. **Clinical Pearls for NEET-PG:** * **Primary Contraction:** Higher in **Wolfe grafts** (due to more elastin in the dermis). * **Secondary Contraction:** Higher in **Thiersch grafts** (leads to more scarring/shriveling). * **Graft Take:** STSGs (Thiersch) survive better on less-than-ideal surfaces via *plasmatic imbibition*, whereas FTSGs (Wolfe) require a highly vascular bed to survive. * **Donor Site:** The donor site of a Wolfe graft must be closed primarily, whereas the donor site of a Thiersch graft heals by spontaneous epithelialization.

Question 86: A Z-plasty is performed in which of the following conditions?

A. High frenal attachment (Correct Answer)
B. Shallow sulcus
C. Deep sulcus
D. Low frenal attachment

Explanation: **Explanation:** **Z-plasty** is a versatile plastic surgery technique involving the transposition of two triangular flaps. Its primary functions are to **increase the length of a scar/tissue** in a specific direction and to change the direction of a scar to align with relaxed skin tension lines. **1. Why "High Frenal Attachment" is correct:** A high labial frenum attachment (where the frenum is attached near the crest of the alveolar ridge or interdental papilla) can cause a diastema, gingival recession, or interfere with denture stability. A **Frenectomy** or **Frenoplasty** is required to reposition it. Z-plasty is the preferred technique for frenoplasty because it effectively **increases the vertical length** of the frenum, thereby "lowering" the attachment point and relieving the tension that was pulling on the gingival margin. **2. Why the other options are incorrect:** * **Shallow/Deep Sulcus:** These conditions relate to the depth of the vestibule. Management usually involves **Vestibuloplasty** (e.g., Clark’s or Kazanjian’s technique) to increase the depth for denture retention, rather than a Z-plasty which is designed for linear lengthening and tension release. * **Low Frenal Attachment:** This is considered a normal anatomical position where the frenum is attached well away from the gingival margin. It does not require surgical intervention. **Clinical Pearls for NEET-PG:** * **The "60-degree" Rule:** The standard Z-plasty uses 60° angles, which results in a theoretical **75% increase in length**. * **Gain in Length:** Larger angles provide more length (e.g., 90° gives 120% gain), but the flaps become harder to transpose. * **Other Indications:** Z-plasty is high-yield for treating **linear burn contractures**, releasing webbed necks (Turner syndrome), and correcting "trap-door" deformities.

Question 87: Which of the following pathologies is etiologically different?

A. Isolated cleft palate
B. Cleft lip and palate (Correct Answer)
C. All are the same
D. None of the above

Explanation: ### Explanation The fundamental concept in the embryology of facial clefts is that **Cleft Lip (CL)** and **Cleft Palate (CP)** are etiologically and genetically distinct entities, despite often occurring together. **1. Why "Cleft Lip and Palate" is the correct answer:** In the context of this question, **Isolated Cleft Palate (CP)** is considered a separate developmental failure compared to **Cleft Lip with or without Cleft Palate (CL ± P)**. * **CL ± P** (Option B) is etiologically linked; if a cleft lip occurs, it often involves the secondary palate due to mechanical interference during development. * **Isolated CP** (Option A) occurs due to a failure of the palatine shelves to elevate or fuse, often associated with different genetic syndromes (e.g., Pierre Robin Sequence) and environmental factors. * Because CL±P and Isolated CP have different embryological timings, sex ratios, and recurrence risks, they are considered **etiologically different**. **2. Why other options are incorrect:** * **Option A (Isolated Cleft Palate):** This is a distinct entity. When compared against CL+P, it represents the "other" side of the etiological divide. * **Option C (All are the same):** This is incorrect because epidemiological studies show that families with a history of isolated CP do not have an increased risk of CL+P, and vice versa. They are genetically independent. **High-Yield Clinical Pearls for NEET-PG:** * **Embryology:** Cleft lip results from failure of fusion between the **Maxillary process** and the **Medial Nasal process** (occurs at 5–6 weeks). Cleft palate results from failure of fusion of **Palatine shelves** (occurs at 8–9 weeks). * **Demographics:** CL+P is more common in **males**, while Isolated CP is more common in **females**. * **Rule of 10s (Millard’s Rule for Cheiloplasty):** Surgery for Cleft Lip is done when the infant is **10 weeks** old, weighs **10 lbs**, and has **10 g/dL** hemoglobin. * **Palatoplasty Timing:** Usually performed between **6–12 months** to allow for speech development while minimizing maxillary growth inhibition.

Question 88: Which of the following findings is seen on examining a child with a 3rd-degree cleft palate?

A. Presence of an ununited palatal process
B. Presence of a united palatal process and a cleft on one side of the premaxilla (Correct Answer)
C. Presence of a united palatal process with a cleft on both sides of the palatal process
D. Bilateral cleft lip and jaw

Explanation: ### Explanation The classification of cleft lip and palate is a high-yield topic for NEET-PG, often based on the **Veau Classification** or the **Davis and Ritchie Classification**. **1. Why Option B is Correct:** The question refers to the **Veau Classification System**, which categorizes clefts into four groups: * **Group I:** Cleft of the soft palate only. * **Group II:** Cleft of the hard and soft palate (posterior to the incisive foramen). * **Group III (3rd Degree):** Complete **unilateral** cleft involving the soft palate, hard palate, and the alveolar ridge (premaxilla) on one side. In this stage, the palatal process is united on one side but separated from the premaxilla on the other. * **Group IV:** Complete **bilateral** cleft involving the soft palate, hard palate, and premaxilla on both sides. **2. Analysis of Incorrect Options:** * **Option A:** Describes a general cleft but lacks the specific unilateral alveolar involvement characteristic of Group III. * **Option C:** This describes a **Group IV (4th Degree)** cleft, where the cleft is present on both sides of the premaxilla/palatal process. * **Option D:** While Group III involves the lip and jaw, the defining anatomical feature in the Veau classification is the unilateral nature of the alveolar/premaxillary defect. **3. Clinical Pearls for NEET-PG:** * **Incisive Foramen:** The anatomical landmark that divides primary (anterior) from secondary (posterior) clefts. * **Rule of 10s (Millard’s Rule):** For cleft lip repair—10 weeks of age, 10 lbs weight, 10 g/dL hemoglobin. * **Surgery Timing:** Cleft Lip repair (Cheiloplasty) is usually done at **3–6 months**; Cleft Palate repair (Palatoplasty) is done at **9–18 months** to allow for speech development while minimizing maxillary growth restriction. * **Most Common Type:** Isolated cleft lip is more common on the **left side**.

Question 89: In a complete cleft palate, the hard palate is totally separated from which structure?

A. Maxilla
B. Soft palate
C. Vomer (Correct Answer)
D. All of the above

Explanation: ### Explanation In a **complete cleft palate**, the primary anatomical defect is the failure of the lateral palatine processes (palatal shelves) to fuse with each other in the midline and, crucially, with the **vomer bone** (the nasal septum) superiorly. **1. Why Vomer is the Correct Answer:** The vomer forms the inferior and posterior part of the nasal septum. In a normal embryo, the palatal shelves elevate and fuse with the lower edge of the vomer to separate the oral cavity from the nasal cavity. In a complete cleft, this fusion fails, leaving the hard palate **totally separated from the vomer**. This results in a direct communication between the mouth and the nose. **2. Analysis of Incorrect Options:** * **Maxilla (A):** The hard palate is actually *composed* of the palatine processes of the maxilla (anteriorly) and the horizontal plates of the palatine bones (posteriorly). It is not "separated" from the maxilla; it is a part of it that failed to meet its counterpart in the midline. * **Soft Palate (B):** While a complete cleft palate involves both the hard and soft palate, they remain continuous with each other in the anteroposterior plane. The cleft runs through both, but they are not separated from one another. * **All of the above (D):** Incorrect because the specific anatomical separation defining a "complete" cleft is the lack of attachment to the midline nasal septum (vomer). **Clinical Pearls for NEET-PG:** * **Embryology:** Cleft palate results from the failure of fusion of **secondary palate** structures (6th–9th week of gestation). * **Muscle Involvement:** In a cleft palate, the **Tensor Veli Palatini** and **Levator Veli Palatini** muscles are malinserted into the posterior edge of the hard palate (instead of forming a midline aponeurosis). * **Surgical Timing:** The standard timing for Cleft Palate repair (Palatoplasty) is **6 to 12 months** of age to allow for speech development while minimizing maxillary growth restriction.

Question 90: Rhytidectomy is:

A. Removal of skin wrinkles (Correct Answer)
B. Correction of nasal septum position
C. Salivary gland excision
D. Cheek augmentation

Explanation: **Explanation:** **Rhytidectomy**, commonly known as a **facelift**, is a cosmetic surgical procedure designed to eliminate visible signs of aging in the face and neck. The term is derived from the Greek words *rhytis* (wrinkle) and *ektome* (excision). The procedure involves the removal of excess facial skin, often combined with the tightening of underlying tissues (such as the SMAS—Superficial Musculoaponeurotic System) to reduce sagging and smooth out deep wrinkles. **Analysis of Options:** * **Option A (Correct):** Rhytidectomy specifically targets the excision of redundant skin to treat **rhytids (wrinkles)**. * **Option B (Incorrect):** Correction of the nasal septum is termed **Septoplasty**. * **Option C (Incorrect):** Excision of a salivary gland is called a **Sialadenectomy** (e.g., Parotidectomy). * **Option D (Incorrect):** Cheek augmentation is known as **Malar augmentation**, often performed using implants or fat grafting. **High-Yield Clinical Pearls for NEET-PG:** * **SMAS Layer:** The most critical anatomical structure in modern rhytidectomy is the **SMAS (Superficial Musculoaponeurotic System)**. Tightening this layer provides a more natural and long-lasting result than skin tension alone. * **Nerve Injury:** The most common nerve injured during a facelift is the **Great Auricular Nerve** (sensory). The most serious motor nerve injury involves the **Marginal Mandibular branch** of the Facial Nerve. * **Hematoma:** The most common complication following rhytidectomy is a **postoperative hematoma**, which requires urgent evacuation to prevent skin flap necrosis. * **Blepharoplasty:** Often performed alongside rhytidectomy, this refers specifically to the surgical repair or reconstruction of the eyelids.

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Wound Healing

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Skin Grafts

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Flap Surgery Principles

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Local Flaps

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Regional Flaps

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Microsurgical Techniques

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Tissue Expansion

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Breast Reconstruction

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Hand Surgery Basics

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Craniofacial Surgery Principles

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Aesthetic Surgery Concepts

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Body Contouring

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