Plastic and Reconstructive Surgery Practice Questions

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.

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

Autograft. **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.

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

Stitches are typically removed at 2 weeks.. **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.

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

Lip. **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.

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

Pedicled horizontal sliding osteotomy. **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.

Q: Graft survival for the first 48 hours is primarily due to which of the following?

Absorption of nutrients into the graft. **Explanation:** The survival of a skin graft occurs in three distinct chronological stages: **Plasmatic Imbibition, Inosculation, and Revascularization.** 1. **Plasmatic Imbibition (First 24–48 hours):** Immediately after transplantation, the graft is avascular. It survives by passively absorbing nutrients and oxygen from the underlying host capillary bed via diffusion. This process causes the graft to increase in weight by approximately 40%. This is the primary mechanism for survival during the first 48 hours. 2. **Inosculation (48–72 hours):** This is the "alignment" phase where donor and recipient capillaries establish a physical connection (the "kissing" of vessels). 3. **Revascularization/Angiogenesis (Day 4–7):** New blood vessels grow from the recipient bed into the graft, establishing definitive circulation. **Analysis of Incorrect Options:** * **Option B & C:** Alignment of capillaries (Inosculation) and full vascularization occur only after the initial 48-hour window. The graft would necrose if it relied on these processes for immediate survival. * **Option D:** Lymphatic circulation is the last to be restored, typically beginning around day 5–7 and completing by the second week. **NEET-PG High-Yield Pearls:** * **Primary mechanism of graft failure:** Hematoma (prevents contact between graft and bed, blocking imbibition). * **Most common cause of graft failure:** Infection (specifically *Streptococcus pyogenes*). * **Full-thickness grafts (FTSG):** Rely more heavily on rapid inosculation compared to split-thickness grafts (STSG) because they are thicker and imbibition is less efficient. * **The "Take":** A graft is considered "taken" once revascularization is complete.

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

Wound edges are well approximated. **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.

Question 1

Poor accessibility is the main disadvantage of which flap?

Accepted Answer

Semilunar

Answer

Trapezoid

Answer

Envelope

Answer

Any of the above

Question 2

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 3

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.

Question 4

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

Accepted Answer

Frenectomy

Answer

Vestibuloplasty

Answer

Ridge augmentation

Answer

Mucogingival surgery

Question 5

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

Accepted Answer

Autograft

Answer

Homograft

Answer

Isograft

Answer

Xenograft

Question 6

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

Accepted Answer

Stitches are typically removed at 2 weeks.

Answer

Suturing should be performed as early as possible.

Answer

Full-thickness skin grafts may be used.

Answer

Sutures should be placed perpendicular to Langer's lines.

Question 7

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

Accepted Answer

Lip

Answer

Breast

Answer

Esophagus

Answer

None of the above

Question 8

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

Accepted Answer

Pedicled horizontal sliding osteotomy

Answer

Onlay bone graft

Answer

Injection of silastic gel

Answer

Insertion of silastic rubber implant

Question 9

Graft survival for the first 48 hours is primarily due to which of the following?

Accepted Answer

Absorption of nutrients into the graft

Answer

Alignment of donor and recipient capillaries

Answer

Vascularization of the graft

Answer

Growth of lymphatics into the graft

Question 10

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

Accepted Answer

Wound edges are well approximated

Answer

Streptococcus infection

Answer

Seroma formation

Answer

Cellulitis

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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