Plastic and Reconstructive Surgery Practice Questions

Q: Which of the following osteotomies is carried out for mandibular deformity?

All of the above. **Explanation:** Mandibular osteotomies are surgical procedures used to reposition the mandible to correct functional and aesthetic deformities such as mandibular prognathism, retrognathism, or asymmetry. The choice of technique depends on the direction and magnitude of the required movement. * **Intraoral Sagittal Split Osteotomy (SSO/BSSO):** This is the most versatile and commonly used procedure. It involves splitting the mandibular ramus sagittally, allowing for both advancement (moving forward) and setback (moving backward) of the mandible. It provides excellent bone-to-bone contact for healing. * **Inverted ‘L’ Osteotomy:** This technique is particularly useful for significant mandibular advancements or when the ramus is short. It is often combined with bone grafting and is preferred in cases of severe retrognathism or hemifacial microsomia. * **‘C’ Osteotomy:** A variation of the ramus osteotomy used primarily for mandibular advancement. It provides a stable platform for bone grafting if necessary. Since all three techniques—Inverted ‘L’, ‘C’, and Sagittal Split—are established surgical approaches to correct mandibular deformities, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Bilateral Sagittal Split Osteotomy (BSSO)** is the "Gold Standard" for most mandibular corrections. * **Complication:** The most common complication of BSSO is injury to the **Inferior Alveolar Nerve**, leading to lower lip numbness. * **Le Fort I Osteotomy** is the standard procedure for **maxillary** (not mandibular) deformities. * **Distraction Osteogenesis** is often the preferred method for severe mandibular hypoplasia (e.g., Pierre Robin Sequence).

Q: Which is the checkpoint for stability of fixation of a ZMC fracture?

Zygomaticomaxillary buttress. ### Explanation The **Zygomaticomaxillary Complex (ZMC)** fracture involves the disruption of four main pillars (buttresses) that connect the zygoma to the facial skeleton. **Why Zygomaticomaxillary (ZM) Buttress is the Correct Answer:** The ZM buttress (also known as the key ridge) is the **primary checkpoint for stability** and the most critical site for rigid internal fixation. While other sutures help in alignment, the ZM buttress is the strongest vertical pillar of the midface. Restoring its continuity ensures that the zygoma can withstand the powerful downward forces exerted by the **masseter muscle**. Without stable fixation at this point, the fracture is prone to displacement and rotation. **Analysis of Incorrect Options:** * **Zygomaticofrontal (ZF) Suture:** This is the primary checkpoint for **anatomical alignment** (reduction). Because it is thin and easily visualized, it helps guide the position, but it is too thin to provide primary structural stability against masticatory forces. * **Arch Symmetry:** The zygomatic arch determines the facial width (projection). While important for aesthetics, it is often managed via a Gillies approach and is not the primary site used to judge the *stability* of the entire complex. * **Infraorbital Rim:** This is a thin, non-weight-bearing area. Fixation here is mainly to prevent "step-off" deformities and protect the infraorbital nerve, but it provides minimal structural stability. **Clinical Pearls for NEET-PG:** * **Order of Reduction:** ZF suture (for alignment) → ZM buttress (for stability). * **Tri-point Fixation:** Usually involves the ZF suture, Infraorbital rim, and ZM buttress. * **Most common clinical feature:** Flattening of the cheek (loss of malar prominence). * **Radiological View of Choice:** Submentovertex view (for zygomatic arch) and Waters’ view (for general ZMC).

Q: All are split-thickness skin grafts except:

Wolfe graft. ### Explanation Skin grafts are classified based on the thickness of the dermis included with the epidermis. The primary distinction is between **Split-Thickness Skin Grafts (STSG)** and **Full-Thickness Skin Grafts (FTSG)**. **Why Wolfe Graft is the Correct Answer:** A **Wolfe graft** is a **Full-Thickness Skin Graft (FTSG)**. It consists of the entire epidermis and the complete thickness of the dermis. Because it includes the full dermal layer, it undergoes less secondary contraction, provides better cosmesis, and is more durable than STSGs. However, it requires a well-vascularized recipient bed to survive (via primary and secondary imbibition). **Analysis of Incorrect Options (STSGs):** Split-thickness grafts are categorized by the amount of dermis included: * **Thiersch Graft (Thin STSG):** Includes the epidermis and a very thin layer of the papillary dermis. It heals the fastest at the donor site but is prone to significant secondary contraction. * **Blair-Brown Graft (Intermediate STSG):** Includes the epidermis and approximately half of the dermis. It is the most commonly used graft in general reconstructive surgery. * **Padgett Graft (Thick STSG):** Includes the epidermis and a major portion of the dermis (three-quarters). It mimics the properties of an FTSG while still allowing the donor site to re-epithelialize spontaneously. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Contraction:** Immediate recoil due to elastin; **FTSG > STSG**. * **Secondary Contraction:** Shrinkage during healing due to myofibroblasts; **STSG > FTSG**. * **Donor Site Healing:** STSGs heal by **re-epithelialization** from skin appendages (hair follicles/sweat glands); FTSG donor sites must be **sutured primarily** or grafted. * **Gold Standard for Face:** Wolfe grafts (FTSG) are preferred for small facial defects (e.g., eyelids) to prevent contracture and maintain texture.

Q: Stability of a denture can be increased by which of the following procedures?

Both V-Y plasty and Z plasty procedures. **Explanation:** The stability and retention of a denture are heavily dependent on the depth of the **vestibule** (the space between the lips/cheeks and the alveolar ridge). In patients with a "shallow vestibule" or high frenal attachments (frenulum), the denture is easily displaced by muscle movements. To correct this, a **Vestibuloplasty** is performed. **Why Option C is Correct:** Both V-Y plasty and Z-plasty are fundamental plastic surgery techniques used in pre-prosthetic surgery to increase vestibular depth: * **V-Y Plasty:** This is commonly used for **frenectomy** or lengthening a localized area. An incision is made in a 'V' shape and closed in a 'Y' shape, which effectively pushes the tissue base further away, thereby deepening the vestibule. * **Z-Plasty:** This involves the transposition of two triangular flaps. In the oral cavity, it is used to release tight fibrous bands or frenula. By redirecting the tension and gaining linear length, it increases the functional depth of the sulcus. **Analysis of Other Options:** * **Options A & B:** While both are correct individually, they are incomplete. Both techniques are standard surgical options for correcting mucosal constraints that interfere with denture stability. * **Option D:** Incorrect, as these procedures are the gold standard for soft-tissue ridge augmentation. **High-Yield Clinical Pearls for NEET-PG:** * **Vestibuloplasty:** The primary goal is to increase the "available" height of the alveolar ridge by lowering the muscle attachments. * **Clark’s Vestibuloplasty:** Uses a mucosal flap from the lip. * **Kazanjian’s Vestibuloplasty:** Uses a flap from the alveolar ridge side. * **Key Concept:** If a question mentions "shallow sulcus" or "high frenal attachment" hindering a denture, look for vestibuloplasty techniques (V-Y, Z-plasty, or skin/mucosal grafting).

Q: In reduction genioplasty, which part of the mandible is reduced?

Symphysis part of mandible. **Explanation:** **Genioplasty** is a surgical procedure used to reposition or reshape the chin to improve facial harmony. The anatomical focus of this procedure is the **symphysis menti**, which is the midline portion of the mandible that forms the chin. 1. **Why Option A is Correct:** In **reduction genioplasty** (indicated for macrogenia or a prominent chin), the surgeon performs an osteotomy of the **symphysis**. A wedge of bone is removed from this midline area, and the distal segment is repositioned posteriorly to reduce the chin's projection. Because the chin's prominence is defined by the symphysis, this is the specific part targeted for reduction. 2. **Why Options B, C, and D are Incorrect:** * **Option B:** While the symphysis is the correct anatomical site, "advancement" refers to **augmentation genioplasty** (used for microgenia), not reduction. * **Options C & D:** The **parasymphysis** refers to the area lateral to the midline (between the symphysis and the mental foramen). While osteotomy lines may extend into the parasymphysis to ensure a smooth jawline contour, the primary aesthetic and structural reduction occurs at the **symphysis**. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve at Risk:** The **Mental Nerve** (a branch of the inferior alveolar nerve) is the most important structure to identify and protect during genioplasty to avoid lower lip anesthesia. * **Blood Supply:** The mobilized bone segment remains viable via the **pedicle of the mylohyoid and geniohyoid muscles** attached to the lingual surface. * **Horizontal Osteotomy:** The standard technique is the "sliding genioplasty," where a horizontal cut is made below the tooth roots. * **Cephalometrics:** Pre-operative planning is typically done using lateral cephalograms to measure the **Pog (Pogonion)** point.

Q: A bipedicle flap is used for the reconstruction of which of the following?

Eyelid. **Explanation:** A **bipedicle flap** (also known as a Tripier flap or bridge flap) is a type of local flap where the tissue remains attached at both ends, ensuring a dual blood supply. This design is particularly advantageous in areas with thin skin and high vascularity requirements. **1. Why Eyelid is Correct:** The reconstruction of the lower eyelid often utilizes a bipedicle flap from the **upper eyelid**. This is the classic **Tripier flap**. Because the eyelid skin is the thinnest in the body and requires a robust blood supply to prevent necrosis and ectropion (outward turning of the lid), the bipedicle design provides superior vascular safety while matching the color and texture of the recipient site perfectly. **2. Why Other Options are Incorrect:** * **Nose:** Nasal reconstruction typically employs the **Forehead flap** (a paramedian pedicled flap) or the **Rintala flap** (advancement). Bipedicle flaps are rarely used here due to the complex 3D contours. * **Finger:** Finger defects are commonly managed with **Cross-finger flaps**, **Thenar flaps**, or **Moberg advancement flaps**. These are usually unipedicled or transposition flaps. * **Breast:** Breast reconstruction primarily utilizes **TRAM flaps** (Transverse Rectus Abdominis Myocutaneous), **DIEP flaps**, or implants. While a TRAM can be "bipedicled" to increase blood flow, it is not the standard primary definition or the most common application associated with the term in basic plastic surgery nomenclature. **Clinical Pearls for NEET-PG:** * **Tripier Flap:** A specific bipedicle flap from the upper lid to the lower lid. * **Vascularity:** The primary advantage of a bipedicle flap is the **redundant blood supply**, making it highly reliable. * **Eyelid Skin:** It is the thinnest skin in the body (approx. 0.5 mm), making local transposition the gold standard for reconstruction.

Q: Poor accessibility is the main disadvantage of which flap?

Semilunar. **Explanation:** In plastic and reconstructive surgery, particularly in oral and maxillofacial procedures, the choice of flap depends on the trade-off between blood supply, ease of closure, and surgical access. **Why Semilunar is the correct answer:** The **Semilunar flap** (a curved incision made in the alveolar mucosa) is primarily used for periapical surgeries (apicoectomies). Its main disadvantage is **poor accessibility**. Because the incision is placed high up in the vestibule, the field of vision is restricted, and the flap provides limited space for instrumentation. Additionally, if the underlying bony defect is larger than anticipated, the incision line may collapse into the defect, leading to poor healing and scarring. **Analysis of Incorrect Options:** * **Envelope Flap:** This is the most common flap used in oral surgery. It involves an intrasulcular incision. Its primary advantage is that it is easy to reflect and provides **excellent accessibility** to the alveolar crest and tooth roots. * **Trapezoid Flap:** This is a modified version of the envelope flap with two vertical releasing incisions. It provides **maximum accessibility** and visibility to the surgical site, especially for deeper structures, making it the opposite of the semilunar flap in terms of exposure. **High-Yield Clinical Pearls for NEET-PG:** * **Semilunar Flap:** Best for avoiding "recession" of the gingival margin around prosthetic crowns, but carries a risk of "scarring" in the aesthetic zone. * **Envelope Flap:** Highest risk of gingival recession but lowest risk of post-operative swelling. * **Triangular Flap:** A compromise between envelope and trapezoid; it uses one vertical releasing incision and provides good blood supply.

Q: All of the following are true about composite skin grafts EXCEPT:

They have a high risk of failure.. **Explanation:** A **composite graft** is defined as a graft containing at least two different tissue types (e.g., skin and cartilage, skin and fat, or skin and bone). Unlike simple skin grafts, composite grafts require a significantly higher metabolic demand to survive. **Why Option B is the Correct Answer (The "Except"):** While composite grafts are technically more demanding than split-thickness grafts, they are **not** characterized by a "high risk of failure" when used appropriately in small dimensions (usually <1–2 cm). In reconstructive surgery, they are considered a reliable and standard technique for specific defects. The statement implies an inherent instability that is clinically inaccurate if surgical principles are followed. **Analysis of Other Options:** * **Option A:** This is **true**. By definition, composite grafts include skin and underlying structures like cartilage (ear) or pulp/fat (fingertip) to provide structural support or contour. * **Option C:** This is **true**. The donor site of a composite graft (e.g., the helical rim of the ear) is a full-thickness defect that cannot be closed primarily without distortion; therefore, a separate skin graft is often needed to close the donor gap. * **Option D:** This is **true**. Composite "cap" grafts are a classic treatment for pediatric fingertip amputations (Allen classification), where the amputated part is sutured back as a composite graft. **NEET-PG High-Yield Pearls:** * **Common Donor Sites:** Helical rim (for alar rim reconstruction), nasal septum, and toe pulp. * **Survival Mechanism:** They survive initially via **plasmatic imbibition**, followed by **inosculation**. * **Size Limitation:** Success depends on a small surface-area-to-volume ratio; they are generally limited to **1 cm to 2 cm** in size to ensure adequate revascularization from the wound edges.

Question 1

Which of the following osteotomies is carried out for mandibular deformity?

Accepted Answer

All of the above

Answer

Inverted 'L' Osteotomy

Answer

'C' Osteotomy

Answer

Intraoral sagittal split Osteotomy

Question 2

Which of the following surgical procedures is indicated for the correction of syndactyly?

Accepted Answer

V-Y advancement flap

Answer

Z plasty

Answer

Rhomboid flap

Answer

Rotation flap

Question 3

Which is the checkpoint for stability of fixation of a ZMC fracture?

Accepted Answer

Zygomaticomaxillary buttress

Answer

Zygomaticofrontal suture

Answer

Arch symmetry

Answer

Infraorbital rim

Question 4

All are split-thickness skin grafts except:

Accepted Answer

Wolfe graft

Answer

Thiersch graft

Answer

Padgett graft

Answer

Blair-Brown graft

Question 5

Stability of a denture can be increased by which of the following procedures?

Accepted Answer

Both V-Y plasty and Z plasty procedures

Answer

V-Y plasty procedure

Answer

Z plasty procedure

Answer

Neither V-Y plasty nor Z plasty procedures

Question 6

In reduction genioplasty, which part of the mandible is reduced?

Accepted Answer

Symphysis part of mandible

Answer

Symphysis part of mandible is advanced

Answer

Parasymphysis part of the mandible is reduced

Answer

Parasymphysis part of the mandible is advanced

Question 7

A bipedicle flap is used for the reconstruction of which of the following?

Accepted Answer

Eyelid

Answer

Nose

Answer

Finger

Answer

Breast

Question 8

Poor accessibility is the main disadvantage of which flap?

Accepted Answer

Semilunar

Answer

Trapezoid

Answer

Envelope

Answer

Any of the above

Question 9

All of the following are true about composite skin grafts EXCEPT:

Accepted Answer

They have a high risk of failure.

Answer

They can cover skin and underlying tissue.

Answer

Skin grafting is required to fill the gap.

Answer

They can be useful in fingertip amputations.

Question 10

A newborn baby is presented with a cleft lip and palate. Which of the following statements is appropriate anticipatory guidance for this family?

Accepted Answer

Recurrent otitis media and hearing loss are likely complications.

Answer

Parenteral alimentation is recommended to prevent aspiration.

Answer

Surgical closure of the palatal defect should be done before 3 months of age.

Answer

Good anatomic closure will preclude the development of speech defects.

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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