Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery Indian Medical PG Practice Questions and MCQs

Question 11: Which of the following is a reference to Millard's rule?

A. Standard rule regarding the composition of local anesthesia.
B. Criteria for the surgery of cleft lip. (Correct Answer)
C. Drug dosage depending on the child's body weight.
D. Rule regarding suture removal.

Explanation: **Explanation:** **Millard’s Rule** (specifically the **Rule of 10s**) is a classic clinical guideline used to determine the optimal timing and fitness of an infant for **cleft lip repair**. Developed by Dr. Ralph Millard, it ensures the child is physiologically stable enough to undergo general anesthesia and surgery. The **Rule of 10s** states that surgery should ideally be performed when the infant meets the following criteria: 1. **Weight:** At least **10 pounds**. 2. **Age:** At least **10 weeks**. 3. **Hemoglobin:** At least **10 grams/dL**. 4. *(Sometimes included)* **WBC count:** Less than **10,000/mm³**. **Analysis of Incorrect Options:** * **Option A:** Local anesthesia composition is typically governed by safe dosage limits (e.g., Lignocaine 4mg/kg without adrenaline) rather than "Millard's rule." * **Option C:** Pediatric drug dosages are calculated using formulas like Clark’s rule or Young’s rule, not Millard’s. * **Option D:** Suture removal timing depends on the anatomical site (e.g., 3–5 days for the face, 10–14 days for joints) and has no specific "Millard's rule." **High-Yield Clinical Pearls for NEET-PG:** * **Cleft Lip Repair:** Most commonly performed using the **Millard Rotation-Advancement Flap** technique. * **Cleft Palate Repair:** Usually performed later (9–18 months) to allow for maxillary growth but before significant speech development. Common techniques include **Veau-Wardill-Kilner (V-Y pushback)** or **Bardach’s** repair. * **Sequence of Management:** Lip repair (10 weeks) → Palate repair (approx. 1 year) → Bone grafting for alveolar cleft (9–11 years).

Question 12: Who developed the symbolic 'Y' classification for cleft lip and palate?

A. Veou
B. Kernahan (Correct Answer)
C. Jackson
D. Edward H. Angle

Explanation: **Explanation:** The correct answer is **Kernahan**. In 1958, Kernahan and Stark introduced a classification system based on the embryological development of the lip and palate. Later, in 1971, Kernahan refined this into the **"Striped Y" classification**. In this symbolic diagram, the incisive foramen serves as the anatomical landmark. The upper arms of the 'Y' represent the primary palate (lip and alveolus), while the base represents the secondary palate (hard and soft palate). This system allows surgeons to visually document the location and severity of the cleft (unilateral vs. bilateral, complete vs. incomplete) by shading specific segments. **Analysis of Incorrect Options:** * **Veau (Option A):** Developed an earlier, simpler classification (Group I-IV) based on anatomical location (e.g., soft palate only, hard and soft palate) but did not use the 'Y' symbol. * **Jackson (Option B):** Known for classifications in craniofacial anomalies and orbital fractures, but not the symbolic 'Y' for clefts. * **Edward H. Angle (Option D):** A pioneer in orthodontics known for the **Angle’s classification of malocclusion** (Class I, II, and III), which relates to the relationship between the maxillary and mandibular first molars. **High-Yield Clinical Pearls for NEET-PG:** * **Incisive Foramen:** The dividing landmark between the primary and secondary palate. * **Millard’s Rotation-Advancement Flap:** The most common surgical technique for unilateral cleft lip repair. * **Rule of 10s (for Cleft Lip Repair):** 10 weeks of age, 10 lbs weight, and 10 g/dL hemoglobin. * **Veau’s Classification:** Still frequently tested; remember Group I is soft palate only, and Group IV is bilateral complete cleft lip and palate.

Question 13: The Y.V plasty procedure is used for which of the following surgical indications?

A. Vestibuloplasty
B. Ridge augmentation
C. Frenectomy (Correct Answer)
D. Mucogingival surgery

Explanation: **Explanation:** The **Y-V Plasty** is a fundamental technique in plastic and reconstructive surgery used to **increase the length** of a tissue surface or release a linear contracture. **Why Frenectomy is the Correct Answer:** A frenum (like the labial or lingual frenum) is a fold of mucous membrane that can sometimes be too short or thick, leading to restricted movement (e.g., ankyloglossia) or periodontal issues. The Y-V plasty involves making a Y-shaped incision; when the edges are repositioned and sutured into a V-shape, the tissue is effectively lengthened. This makes it an ideal surgical technique for a **frenectomy** (specifically a frenoplasty) to release the tension of a restrictive frenum. **Analysis of Incorrect Options:** * **Vestibuloplasty:** This procedure aims to increase the depth of the alveolar sulcus. While various flaps are used, the standard techniques are Clark’s or Kazanjian’s vestibuloplasty, not typically a Y-V plasty. * **Ridge Augmentation:** This involves bone grafting or guided tissue regeneration to increase the height/width of the alveolar ridge for implants. It is a hard-tissue procedure, whereas Y-V plasty is a soft-tissue lengthening technique. * **Mucogingival Surgery:** This is a broad category of periodontal procedures (like lateral positioned flaps or free gingival grafts) to correct defects in the morphology of the gingiva. While frenectomy is a *type* of mucogingival surgery, Y-V plasty is specifically the surgical *method* used for the frenum release. **High-Yield Clinical Pearls for NEET-PG:** * **V-Y Plasty vs. Y-V Plasty:** Remember the direction. **V-Y** is used to *advance* tissue or close a defect (the stem of the Y is the closure). **Y-V** is used to *lengthen* tissue (the V-shape pushes the tissue forward). * **Z-Plasty:** Another high-yield topic; it is used to gain length and change the direction of a scar. A 60° angle Z-plasty provides a **75% increase** in length. * **W-Plasty:** Used to break up a long linear scar into a zigzag to make it less noticeable; it does *not* add length.

Question 14: For a split-skin graft, what is the best source?

A. Autograft (Correct Answer)
B. Homograft
C. Isograft
D. Xenograft

Explanation: **Explanation:** In plastic and reconstructive surgery, the success of a skin graft depends primarily on the immunological compatibility between the donor and the recipient. **1. Why Autograft is the Correct Answer:** An **Autograft** involves transferring tissue from one site to another on the **same individual**. Because the donor and recipient are genetically identical, there is no risk of immunological rejection. This allows for permanent "take" and vascularization of the split-skin graft (SSG). It remains the "gold standard" for definitive wound closure in burns and reconstructive procedures. **2. Why Other Options are Incorrect:** * **Homograft (Allograft):** Tissue taken from another individual of the same species (e.g., cadaveric skin). While useful as a temporary biological dressing to reduce fluid loss and infection, it is eventually rejected by the recipient's immune system (T-cell mediated response) and is not a permanent source. * **Isograft (Syngeneic graft):** Tissue taken from a genetically identical donor (an identical twin). While it does not undergo rejection, it is rarely the "best source" due to the extreme rarity of having an identical twin available for donation. * **Xenograft (Heterograft):** Tissue taken from a different species (e.g., porcine/pig skin). These are strictly temporary and are rapidly rejected; they serve only as short-term biological covers. **Clinical Pearls for NEET-PG:** * **Split-Skin Graft (SSG):** Includes the epidermis and a variable portion of the dermis. It heals at the donor site by **re-epithelialization** from skin appendages (hair follicles, sweat glands). * **Graft Take Stages:** 1. Plasmatic imbibition (first 24–48h), 2. Inosculation (alignment of capillaries), 3. Revascularization/Angiogenesis. * **Primary Contraction:** Seen more in Full-Thickness Skin Grafts (FTSG) due to elastin content. * **Secondary Contraction:** Seen more in SSG during the healing phase.

Question 15: Which of the following statements regarding the management of facial lacerations is FALSE?

A. Suturing should be performed as early as possible.
B. Full-thickness skin grafts may be used.
C. Sutures should be placed perpendicular to Langer's lines.
D. Stitches are typically removed at 2 weeks. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D**, as it is a false statement. In facial surgery, the primary goal is to minimize scarring. The face has an excellent blood supply, which promotes rapid healing. Therefore, facial sutures are typically removed early—usually within **5 to 7 days**. Leaving sutures in for 2 weeks (14 days) on the face significantly increases the risk of "railroad track" scarring and permanent suture marks. **Analysis of other options:** * **Option A:** Early primary closure (within 6–8 hours) is ideal for facial lacerations to reduce infection risk and improve cosmetic outcomes. Due to the face's high vascularity, the "golden period" for closure can sometimes be extended up to 24 hours. * **Option B:** Full-thickness skin grafts (FTSG) are frequently used in facial reconstruction (e.g., after tumor excision) because they provide better color match, texture, and less secondary contraction compared to split-thickness grafts. * **Option C:** For the best cosmetic result, incisions or repairs should ideally follow **Langer’s lines** (Relaxed Skin Tension Lines). Sutures are placed **perpendicular** to these lines to pull the wound edges together effectively, ensuring the resulting scar lies parallel to the natural skin folds. **High-Yield Clinical Pearls for NEET-PG:** * **Suture Material:** 5-0 or 6-0 Monofilament (e.g., Prolene or Ethilon) is preferred for the skin to minimize tissue reaction. * **Suture Removal Timeline:** Face (5–7 days), Scalp (7–10 days), Trunk/Extremities (10–14 days), Over joints (14 days). * **Langer’s Lines:** These correspond to the orientation of collagen fibers in the dermis. Cutting parallel to them results in fine scars; cutting across them leads to widened or hypertrophic scars.

Question 16: Abbe-Estlander flap is used in the repair of which structure?

A. Breast
B. Lip (Correct Answer)
C. Esophagus
D. None of the above

Explanation: **Explanation:** The **Abbe-Estlander flap** is a classic reconstructive technique used for **lip defects**. It is a **cross-lip arterialized flap** that involves transferring a full-thickness segment of one lip (including skin, muscle, and mucosa) to fill a defect in the opposite lip. * **Mechanism:** The flap is based on the **labial artery** (a branch of the facial artery). * **Abbe Flap:** Specifically used for defects in the central portion of the upper or lower lip that do not involve the oral commissure (corner of the mouth). It is a two-stage procedure where the vascular pedicle is divided after 2–3 weeks. * **Estlander Flap:** Used for defects involving the **oral commissure**. Unlike the Abbe flap, it is usually a one-stage procedure but results in a rounded corner of the mouth that may require later commissuroplasty. **Analysis of Incorrect Options:** * **A. Breast:** Breast reconstruction typically utilizes flaps like the TRAM (Transverse Rectus Abdominis Myocutaneous), DIEP (Deep Inferior Epigastric Perforator), or Latissimus Dorsi flap. * **C. Esophagus:** Esophageal reconstruction usually involves gastric pull-up, colonic interposition, or a free jejunal flap. **High-Yield Clinical Pearls for NEET-PG:** * **Karapandzic Flap:** Another lip reconstruction technique used for large defects; it preserves the nerve and blood supply but may cause microstomia (small mouth). * **Gillies Fan Flap:** Used for large lateral lip defects. * **V-Y Advancement:** Commonly used for small vermilion defects. * **Rule of Thumb:** Defects up to **1/3rd** of the lip can usually be closed primarily; defects between **1/3rd and 2/3rd** require flaps like the Abbe-Estlander.

Question 17: For the best long-term results in augmentation genioplasty, which of the following procedures is recommended?

A. Onlay bone graft
B. Injection of silastic gel
C. Insertion of silastic rubber implant
D. Pedicled horizontal sliding osteotomy (Correct Answer)

Explanation: **Explanation:** **Pedicled horizontal sliding osteotomy** is considered the gold standard for augmentation genioplasty because it utilizes the patient’s own vascularized bone. In this procedure, the lower border of the mandible is cut horizontally and advanced forward. Because the bone remains attached to the lingual musculature (geniohyoid and digastric muscles), it maintains a functional blood supply (**pedicled**). This ensures predictable bone healing, long-term stability, and a natural aesthetic contour. **Why other options are incorrect:** * **Onlay bone graft (Option A):** While autologous, non-pedicled bone grafts (like iliac crest) are prone to significant and unpredictable **resorption** over time when placed as an onlay, leading to loss of the initial correction. * **Injection of silastic gel (Option B):** Liquid or gel injections are associated with high rates of migration, foreign body granulomas, and chronic inflammation. They are generally contraindicated for structural chin augmentation. * **Insertion of silastic rubber implant (Option C):** Alloplastic implants are common but carry risks of infection, displacement, and **pressure-induced bone resorption** of the underlying symphysis. They do not provide the same structural permanence as an osteotomy. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve at Risk:** The **Mental Nerve** (branch of the inferior alveolar nerve) must be identified and protected during the osteotomy to avoid lower lip numbness. * **Advantage:** Sliding osteotomy can correct vertical discrepancies (short or long chin) in addition to horizontal deficiency, which implants cannot do effectively. * **Stability:** The pedicled osteotomy is the most stable method for advancements greater than 10 mm.

Question 18: The Abbe-Estlander flap is primarily used for reconstruction of which anatomical structure?

A. Lip (Correct Answer)
B. Tongue
C. Eyelid
D. Ear

Explanation: **Explanation:** The **Abbe-Estlander flap** is a classic **cross-lip arterialized flap** used for the reconstruction of full-thickness defects of the lip. The procedure involves transferring a wedge-shaped portion of one lip (usually the lower) to fill a defect in the opposite lip (usually the upper), or vice versa. * **Why Lip is correct:** The flap is based on the **labial artery** (a branch of the facial artery). * The **Abbe flap** is used for central lip defects that do not involve the oral commissure. It is a two-stage procedure where the pedicle is divided after 2–3 weeks. * The **Estlander flap** is a modification used specifically for defects involving the **oral commissure** (the corner of the mouth). It is typically a one-stage procedure but may require subsequent commissuroplasty. * **Why other options are incorrect:** * **Tongue:** Reconstruction usually involves primary closure, skin grafts, or free flaps (like the Radial Forearm Free Flap) for larger defects. * **Eyelid:** Common flaps include the **Hughes flap** (tarsoconjunctival) or **Tripier flap** (musculocutaneous). * **Ear:** Reconstruction often utilizes costal cartilage frameworks or local skin flaps like the **Dieffenbach flap**. **High-Yield Clinical Pearls for NEET-PG:** * **Principle:** It is an example of a **composite flap** (containing skin, muscle, and mucosa). * **Key Artery:** The **Inferior/Superior Labial Artery**, which runs between the orbicularis oris muscle and the mucosa. * **Rule of Thirds:** Lip defects up to **1/3rd** can be closed primarily; defects between **1/3rd and 2/3rd** typically require an Abbe-Estlander or Karapandzic flap.

Question 19: What is true about hypertrophic scars?

A. No genetic predisposition
B. More common in blood group A (Correct Answer)
C. No HLA association
D. Predominantly collagen type III

Explanation: ### Explanation Hypertrophic scars are fibroproliferative disorders resulting from an abnormal response to dermal injury, characterized by excessive collagen deposition within the boundaries of the original wound. **Why Option B is Correct:** Epidemiological studies have identified a significant correlation between ABO blood groups and the development of pathological scarring. Individuals with **Blood Group A** have a statistically higher predisposition to developing hypertrophic scars compared to other blood groups. This is a high-yield fact often tested in surgical entrance exams to differentiate genetic/biochemical risk factors. **Analysis of Incorrect Options:** * **Option A (No genetic predisposition):** This is incorrect. There is a clear genetic component to abnormal scarring. While less pronounced than in keloids, hypertrophic scars show familial tendencies and are more common in darker-skinned individuals (Fitzpatrick scales IV-VI). * **Option C (No HLA association):** This is incorrect. Hypertrophic scarring is associated with specific Human Leukocyte Antigens, most notably **HLA-B14, HLA-B21, and HLA-DR5**. * **Option D (Predominantly collagen type III):** This is incorrect. While both keloids and hypertrophic scars have increased collagen, the predominant type in a mature hypertrophic scar is **Type I collagen**, though the ratio of Type III to Type I is higher than in normal skin. **Clinical Pearls for NEET-PG:** * **Boundary:** Hypertrophic scars stay **within the limits** of the original wound; Keloids extend beyond the margins. * **Regression:** Hypertrophic scars often **spontaneously regress** over 6–18 months; Keloids rarely do. * **Location:** Hypertrophic scars occur across flexor surfaces/joints (tension areas); Keloids favor the earlobe, deltoid, and presternal areas. * **Histology:** Hypertrophic scars contain collagen bundles arranged **parallel** to the epithelial surface, whereas keloids have disorganized, thick "glassy" collagen bundles.

Question 20: Skin grafting is not contraindicated in which of the following conditions?

A. Streptococcus infection
B. Seroma formation
C. Wound edges are well approximated (Correct Answer)
D. Cellulitis

Explanation: **Explanation:** The success of a skin graft depends on **plasmatic imbibition** (first 24–48 hours), followed by **inosculation** and **revascularization**. Any factor that prevents the graft from adhering firmly to the recipient bed or introduces infection will lead to graft failure. **Why "Wound edges are well approximated" is correct:** Well-approximated wound edges indicate a healthy, clean, and stable wound bed. In reconstructive surgery, skin grafting is often performed on such surfaces (e.g., after excision of a lesion or a clean burn) to provide coverage. This condition is an **indication**, not a contraindication. **Why the other options are incorrect:** * **Streptococcus infection (A):** Group A Beta-hemolytic Streptococcus is an absolute contraindication for grafting. It produces enzymes like **streptokinase** and **hyaluronidase** that dissolve the fibrin glue necessary for graft adherence, leading to certain failure. * **Seroma formation (B):** A seroma (or hematoma) creates a physical barrier between the graft and the recipient bed. This prevents the diffusion of nutrients (plasmatic imbibition), leading to graft necrosis. * **Cellulitis (D):** Active infection of the surrounding skin (cellulitis) indicates an inflammatory state with high bacterial load. Grafting in an infected field is contraindicated until the infection is cleared. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of graft failure:** Hematoma formation. * **Most common organism causing graft failure:** *Pseudomonas aeruginosa* (though *Streptococcus* is more destructive). * **Bacterial Count:** For a graft to "take," the bacterial count in the wound should ideally be less than **$10^5$ organisms per gram** of tissue. * **Ideal Recipient Bed:** Must be vascular (e.g., periosteum, perichondrium, or granulation tissue). Grafts will not take on bare bone, bare tendon, or infected tissue.

Practice by Chapter

Wound Healing

Practice Questions

Skin Grafts

Practice Questions

Flap Surgery Principles

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Local Flaps

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Regional Flaps

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Microsurgical Techniques

Practice Questions

Tissue Expansion

Practice Questions

Breast Reconstruction

Practice Questions

Hand Surgery Basics

Practice Questions

Craniofacial Surgery Principles

Practice Questions

Aesthetic Surgery Concepts

Practice Questions

Body Contouring

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