Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery Indian Medical PG Practice Questions and MCQs

Question 41: Revascularization of a skin graft typically occurs after approximately how many days?

A. 2 days
B. 3 days
C. 4 days
D. 5 days (Correct Answer)

Explanation: ### Explanation The survival of a skin graft depends on a specific sequence of biological events. **Revascularization** (the establishment of a definitive circulatory network between the graft and the host bed) typically occurs around **Day 5**. **The Stages of Graft Take:** 1. **Plasmatic Imbibition (0–48 hours):** The graft acts like a sponge, absorbing nutrients and oxygen from the wound bed via capillary action. The graft typically looks edematous and pale. 2. **Inosculation (48 hours–Day 5):** Direct alignment and "kissing" of host and graft capillaries occur. This is a transitional phase where a rudimentary circulation begins. 3. **Revascularization/Angiogenesis (Day 5 onwards):** New blood vessels grow from the host bed into the graft (neovascularization), and mature anastomoses are formed. By the 5th day, the graft develops a pink hue, signaling successful take. **Analysis of Options:** * **A (2 days):** At this stage, the graft is still in the stage of **plasmatic imbibition**. It is not yet vascularized and is held in place only by a fibrin clot. * **B & C (3–4 days):** These represent the **inosculation** phase. While some blood flow begins, the definitive vascular network is not fully established until Day 5. * **D (5 days):** This is the clinically accepted timeframe for definitive **revascularization**. This is also why the first graft dressing is typically changed on Day 5—to ensure the graft is stable and vascularized. **NEET-PG High-Yield Pearls:** * **Primary cause of graft failure:** Hematoma (prevents contact between graft and bed). * **Secondary cause of graft failure:** Infection (specifically *Group A Streptococcus*). * **Full-thickness grafts (FTSG)** undergo more primary contraction but less secondary contraction compared to **Split-thickness grafts (STSG)**. * **Bridging phenomenon:** The ability of a graft to survive over a small non-vascularized area (like a tendon) by receiving collateral blood supply from adjacent vascularized tissue.

Question 42: Which of the following grafts is commonly used to replace defective mandibular condyles in children?

A. Costochondral graft (Correct Answer)
B. Sternoclavicular graft
C. Calvarial graft
D. Metatarsal graft

Explanation: **Explanation:** The **Costochondral Graft (CCG)** is the gold standard for mandibular condyle reconstruction in pediatric patients, particularly in cases of congenital anomalies (like Hemifacial Microsomia) or post-traumatic ankylosis. **Why it is the correct choice:** The primary reason for selecting a costochondral graft in children is its **growth potential**. The cartilaginous cap of the rib acts as a "growth center," mimicking the physiological behavior of the natural condyle. This allows the reconstructed mandible to grow in symmetry with the rest of the facial skeleton as the child matures. Furthermore, it is biologically compatible, easy to harvest (usually from the 4th, 5th, or 6th rib), and provides both a rigid bony base for fixation and a smooth cartilaginous surface for joint articulation. **Analysis of Incorrect Options:** * **Sternoclavicular graft:** While it anatomically resembles the Temporomandibular Joint (TMJ) due to its fibrocartilage and disc, it is technically difficult to harvest and carries a risk of injury to the great vessels. * **Calvarial graft:** This is a membranous bone graft. While excellent for contouring defects or orbital floor repairs, it lacks a cartilaginous component and cannot facilitate longitudinal growth. * **Metatarsal graft:** Historically used for small joint reconstructions, it has been largely abandoned for the mandible due to donor site morbidity and inferior growth predictability compared to CCG. **High-Yield Clinical Pearls for NEET-PG:** * **Donor Site:** The 4th, 5th, or 6th rib is typically used. * **The "Growth" Factor:** The main complication of CCG in children is **overgrowth**, which may lead to secondary facial asymmetry. * **Adults vs. Children:** In adults, where growth is complete, reconstruction is more commonly done using vascularized bone flaps (e.g., Fibula flap) or prosthetic joints.

Question 43: Abbey's flap is used for reconstruction of which anatomical structure?

A. Breast
B. Upper lip (Correct Answer)
C. Cheek
D. Lower lip

Explanation: **Explanation:** The **Abbe flap** (also known as a cross-lip flap or lip-switch flap) is a classic reconstructive technique used primarily for **upper lip defects** that involve more than one-third but less than two-thirds of the lip length. **Why Upper Lip is Correct:** The procedure involves harvesting a full-thickness wedge-shaped pedicled flap from the **lower lip** (usually the central portion) and rotating it 180 degrees into a central defect of the **upper lip**. The flap remains attached by a narrow vascular pedicle containing the **labial artery** for 2–3 weeks to ensure blood supply before the pedicle is divided in a second stage. It is most commonly used to correct post-traumatic defects or congenital deformities like a "tight" upper lip following a bilateral cleft lip repair. **Analysis of Incorrect Options:** * **Lower Lip:** While the flap is *taken* from the lower lip, it is used to *reconstruct* the upper lip. (Note: The Estlander flap is a similar lip-switch technique used specifically for defects involving the oral commissure). * **Breast:** Breast reconstruction typically utilizes flaps like the TRAM (Transverse Rectus Abdominis Myocutaneous), DIEP, or Latissimus Dorsi flaps. * **Cheek:** Cheek defects are usually managed with local advancement flaps (like the Mustarde flap) or free flaps, depending on the size. **High-Yield Clinical Pearls for NEET-PG:** * **Vascular Basis:** The flap is based on the **inferior labial artery**. * **Staged Procedure:** It is a **two-stage** procedure (division occurs at 14–21 days). * **Estlander Flap vs. Abbe Flap:** The Estlander flap involves the **commissure** (corner of the mouth), whereas the Abbe flap does not. * **Gillies Fan Flap:** Another high-yield lip reconstruction term; it is used for large lower lip defects by rotating tissue from the cheek/nasolabial area.

Question 44: Keloid formation is least likely seen over which of the following areas?

A. Ear
B. Deltoid
C. Eyelid (Correct Answer)
D. Presternal region

Explanation: **Explanation:** Keloids are benign overgrowths of dense fibrous tissue (collagen) that extend beyond the boundaries of the original wound. Their formation is highly dependent on **skin tension** and the density of skin appendages. **Why Eyelid is the correct answer:** The **eyelid** (along with the scrotum and palms/soles) is characterized by very thin skin with minimal tension and a lack of pilosebaceous units. These anatomical factors make it highly resistant to keloid formation. In clinical practice, keloids are almost never seen on the eyelids, making it the "least likely" site among the options. **Analysis of Incorrect Options:** * **Presternal region:** This is the **most common** site for keloids due to high constant skin tension from the pectoralis muscles and chest wall movement. * **Deltoid/Shoulder:** A very common site, often triggered by vaccinations (like BCG) or trauma, due to high tension during arm movement. * **Ear:** A frequent site for keloids, typically occurring on the lobule following ear piercing. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Keloids extend **beyond** the margin of the original wound and do not regress spontaneously (unlike hypertrophic scars). * **Common Sites (High to Low):** Presternal > Shoulder/Deltoid > Upper back > Ear lobule. * **Rare Sites:** Eyelids, Scrotum, Palms, and Soles. * **Histology:** Characterized by thick, disorganized, "glassy" **Type I and Type III collagen** bundles. * **Treatment:** Intralesional Triamcinolone (steroids) is the first-line medical treatment. Excision alone has a high recurrence rate (>50%).

Question 45: Which statement regarding osteotomies is correct?

A. Osteotomies of the Le Fort III type, like the Le Fort III fracture, are not associated with great blood loss and therefore the patient rarely needs more than 2 pints of blood transfused.
B. Osteotomies of the Le Fort III type, if done with the use of a bicoronal flap, are not followed by nerve paresthesias postoperatively.
C. Osteotomies of the Le Fort III type are most commonly indicated in syndromes associated with the early closure of cranial sutures. (Correct Answer)
D. Osteotomies of the Le Fort II type produce maxillary necrosis in the cleft palate patient.

Explanation: ### Explanation **1. Why Option C is Correct:** Le Fort III osteotomy (subcranial midface distraction) is the gold standard for correcting **midface hypoplasia** associated with **craniosynostosis syndromes** (e.g., Apert, Crouzon, and Pfeiffer syndromes). These conditions involve premature closure of cranial sutures, leading to a recessed midface, exorbitism (shallow orbits), and class III malocclusion. The osteotomy involves a complete disjunction of the midface from the cranium to advance the entire zygomatic-maxillary complex. **2. Why the Other Options are Incorrect:** * **Option A:** Le Fort III osteotomies are major craniofacial procedures involving extensive bone cuts and proximity to the pterygoid plexus and internal maxillary artery. They are associated with **significant blood loss**, often requiring multiple units of blood transfusion, unlike the statement suggests. * **Option B:** The use of a **bicoronal flap** and the osteotomy itself frequently involve manipulation of the supraorbital, infraorbital, and zygomaticotemporal nerves. Postoperative **paresthesia** (temporary or permanent) is a common complication, not an exception. * **Option D:** While cleft palate patients have compromised vascularity due to previous scarring, Le Fort II osteotomies do not typically cause total maxillary necrosis. Modern surgical techniques preserve the **ascending palatine artery** and pharyngeal flaps, maintaining adequate blood supply. **3. High-Yield Clinical Pearls for NEET-PG:** * **Le Fort I:** Used for correcting malocclusion (e.g., maxillary retrusion). * **Le Fort II:** Indicated for nasomaxillary hypoplasia. * **Le Fort III:** Indicated for total midface deficiency and exorbitism. * **Blood Supply:** The primary blood supply to the mobilized maxilla in Le Fort I is the **ascending palatine branch** of the facial artery and the palatine branch of the maxillary artery. * **Complication:** The most common sensory nerve affected in Le Fort I and II is the **infraorbital nerve**.

Question 46: What is the surgical procedure of choice for skeletal class 2 malocclusion due to a retrognathic mandible?

A. Le Fort I osteotomy
B. Advancement genioplasty
C. Bilateral Sagittal Split Osteotomy (BSSO) setback of the mandible
D. Bilateral Sagittal Split Osteotomy (BSSO) advancement of the mandible (Correct Answer)

Explanation: ### Explanation **Concept Overview:** Skeletal Class 2 malocclusion is characterized by a "convex" facial profile where the lower jaw (mandible) is positioned posterior to its normal relationship with the maxilla. When this is specifically due to a **retrognathic mandible** (underdeveloped or recessed lower jaw), the goal of surgery is to move the mandibular body forward to achieve a Class 1 molar relationship and improve the airway and profile. **Why the Correct Answer is Right:** * **Bilateral Sagittal Split Osteotomy (BSSO) advancement** is the gold standard for correcting mandibular retrognathism. * The procedure involves a longitudinal split of the mandibular ramus, allowing the tooth-bearing segment to be slid forward (**advancement**) while maintaining bone-to-bone contact for stable healing. **Analysis of Incorrect Options:** * **A. Le Fort I osteotomy:** This involves a horizontal fracture of the maxilla. It is used to correct maxillary deformities (e.g., vertical maxillary excess or retrusion), not primary mandibular retrognathism. * **B. Advancement genioplasty:** This procedure moves only the chin point (symphysis) forward. While it improves the aesthetic profile, it **does not correct the dental malocclusion** or the position of the teeth. * **C. BSSO setback:** This is used to move the mandible backward. It is the treatment of choice for **Skeletal Class 3** malocclusion (mandibular prognathism/"protruding jaw"). **High-Yield Clinical Pearls for NEET-PG:** * **BSSO Advantage:** It allows for rigid internal fixation (RIF) and usually does not require intermaxillary fixation (IMF/wiring the jaws shut). * **Most Common Complication of BSSO:** Injury to the **Inferior Alveolar Nerve (IAN)**, leading to temporary or permanent paresthesia of the lower lip and chin. * **Cephalometry:** The **ANB angle** is used to diagnose Class 2 (increased ANB) vs. Class 3 (decreased/negative ANB) malocclusions.

Question 47: What is the most common congenital anomaly of the face?

A. Cleft lip alone
B. Isolated cleft palate
C. Cleft lip and cleft palate (Correct Answer)
D. All have equal incidence

Explanation: **Explanation:** Congenital orofacial clefts are among the most common birth defects worldwide. The correct answer is **Cleft lip and cleft palate (CLP)** because, statistically, the combined occurrence of both anomalies is more frequent than either occurring in isolation. 1. **Why Cleft Lip and Cleft Palate (CLP) is correct:** Approximately **45-50%** of all orofacial cleft cases present as a combination of cleft lip and cleft palate. This occurs due to a failure of the primary palate (intermaxillary segment) and secondary palate (palatal shelves) to fuse during the 4th to 12th weeks of gestation. It is more common in males and is more frequently seen on the left side. 2. **Why other options are incorrect:** * **Isolated Cleft Palate (CP):** Accounts for about **30%** of cases. Unlike CLP, it is more common in females and is often associated with syndromes (e.g., Pierre Robin Sequence). * **Cleft Lip alone (CL):** Accounts for approximately **20-25%** of cases. While common, its incidence is lower than the combined deformity. * **Equal incidence:** This is incorrect as epidemiological studies consistently show a hierarchy in frequency (CLP > CP > CL). **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s (Millard’s criteria for CL repair):** 10 weeks of age, 10 lbs weight, and 10 g/dL Hemoglobin. * **Timing of Surgery:** Cleft Lip repair (Cheiloplasty) is usually done at **3–6 months**, while Cleft Palate repair (Palatoplasty) is done at **9–18 months** (to allow for speech development but before speech patterns are fixed). * **Most common side:** Left-sided unilateral clefts are the most common presentation. * **Etiology:** Multifactorial (genetic + environmental factors like maternal smoking or anticonvulsant use).

Question 48: Which of the following incision is preferred to excise a lesion on the bridge of the nose?

A. Circular
B. Elliptical
C. Vertical
D. Horizontal (Correct Answer)

Explanation: The correct answer is **D. Horizontal**. ### **Explanation** The primary principle governing surgical incisions in plastic surgery is to align them with **Langer’s Lines** (Relaxed Skin Tension Lines - RSTLs). These lines represent the orientation of dermal collagen fibers. Incisions made parallel to these lines experience minimal tension, resulting in finer, less visible scars and better wound healing. 1. **Why Horizontal is Correct:** On the **bridge of the nose**, the Relaxed Skin Tension Lines (RSTLs) run horizontally. Therefore, a horizontal incision (or a horizontal elliptical excision) ensures that the resulting scar is hidden within the natural skin creases and is subject to the least amount of tension during facial expressions. 2. **Why Vertical is Incorrect:** A vertical incision on the nasal bridge runs perpendicular to the RSTLs. This leads to increased wound tension, which can cause widened, hypertrophic scars or even "bowstringing" (contracture), which distorts the nasal profile. 3. **Why Circular/Elliptical are Incorrect:** While an "elliptical" shape is the standard *method* for excising a lesion to allow primary closure, the question asks for the **orientation** (direction). A circular excision cannot be closed primarily without creating "dog-ears" (skin bunching), and an ellipse must still be oriented horizontally to be aesthetically acceptable. ### **High-Yield Clinical Pearls for NEET-PG** * **Langer’s Lines:** Always choose the option that follows these lines for the best cosmetic outcome. * **Face vs. Body:** On the forehead and nasal bridge, RSTLs are **horizontal**. On the limbs, they are generally **longitudinal/vertical**, and on the trunk, they are **transverse/circumferential**. * **Exception:** In the eyelids, incisions should follow the natural horizontal palpebral creases. * **Hypertrophic Scars vs. Keloids:** Incisions made against tension lines are a major risk factor for hypertrophic scars, which (unlike keloids) stay within the boundaries of the original wound.

Question 49: Pollicization is best described as?

A. Amputation of the thumb
B. Equalization of fingers
C. Toe to thumb transplantation
D. Reconstruction of the thumb (Correct Answer)

Explanation: **Explanation:** **Pollicization** is a specialized reconstructive surgical procedure where a functional finger (most commonly the **index finger**) is surgically repositioned to the thumb position to replace a missing or severely hypoplastic thumb. The goal is to restore the essential functions of the thumb, specifically **opposition and pinch grip**, which are vital for hand utility. **Why Option D is Correct:** The term is derived from the Latin *pollex* (thumb). It involves neurovascular transposition of a digit, maintaining its blood supply and nerve sensation, while shortening the bone and reorienting the muscles to mimic thumb biomechanics. It is the gold standard for treating **Thumb Hypoplasia (Muller types IIIB, IV, and V)**. **Analysis of Incorrect Options:** * **Option A (Amputation):** This refers to the removal of the thumb, which is the opposite of reconstruction. * **Option B (Equalization):** This is not a standard surgical term for thumb reconstruction. While the procedure involves adjusting lengths, "equalization" does not describe the transposition process. * **Option C (Toe to thumb transplantation):** While this is a method of thumb reconstruction, it is specifically called a **"Toe-to-Hand Transfer"** (usually using the great toe or second toe). Pollicization specifically refers to using an existing finger from the same hand. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Congenital thumb aplasia/hypoplasia, traumatic loss of the thumb at the carpometacarpal level. * **Most common donor:** The **index finger** is the preferred donor digit due to its proximity and independent mobility. * **Buck-Gramcko Technique:** The most widely used surgical technique for pollicization. * **Key Step:** The index metacarpal is shortened and the metacarpophalangeal (MCP) joint of the index finger becomes the new **carpometacarpal (CMC) joint** of the reconstructed thumb.

Question 50: Which treatment is considered the most successful for cleft palate?

A. Mirault Blair operation
B. Miller's rotation advancement
C. Langenbeck's operation (Correct Answer)
D. None of the above

Explanation: **Explanation:** The primary goal of cleft palate surgery (Palatoplasty) is to create a functional partition between the oral and nasal cavities and to facilitate normal speech development. **Langenbeck’s Operation (Bipedicled Flap)** is considered a classic and highly successful technique for repairing cleft palate. It involves making relaxing incisions along the lateral borders of the palate (near the alveolar ridge) to create two bipedicled mucoperiosteal flaps. These flaps are then mobilized medially and sutured in the midline. This technique is particularly effective for closing the hard palate defect without excessive tension, which is crucial for successful healing and preventing dehiscence. **Analysis of Incorrect Options:** * **Mirault-Blair Operation:** This is an archaic technique used for **Cleft Lip** repair, not cleft palate. It has largely been replaced by modern procedures. * **Millard’s Rotation-Advancement Flap:** This is the "gold standard" and most commonly used procedure for **Unilateral Cleft Lip** repair. It is a lip-shaping procedure and does not address the palatal defect. **Clinical Pearls for NEET-PG:** * **Timing of Surgery:** Cleft Lip is typically repaired at **3–6 months** (Rule of 10s), while Cleft Palate is ideally repaired between **6–12 months** to allow for speech development before compensatory habits form. * **Veau-Wardill-Kilner Operation:** Another common palatoplasty technique (V-Y pushback) used to increase the length of the soft palate. * **Complication:** The most common complication of palatoplasty is the formation of a **palatal fistula**. * **Muscle of concern:** In cleft palate, the *Levator veli palatini* is abnormally attached to the posterior border of the hard palate; surgical correction aims to reorient this muscle transversely.

Practice by Chapter

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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