Plastic and Reconstructive Surgery Practice Questions

Q: In Kernahan's striped 'Y' classification, what is the main reference point?

Incisive foramen. ***Incisive foramen*** - The **incisive foramen** is the central point in the Kernahan's striped 'Y' classification for cleft lip and palate. - This classification system uses the **incisive foramen** as a boundary to distinguish between primary and secondary palatal defects. *Soft palate* - While the **soft palate** can be affected in cleft conditions, it is not the main reference point for the Kernahan's striped 'Y' classification. - Defects of the **soft palate** are part of the secondary palate, but the classification's division hinges on the incisive foramen. *Hard palate* - The **hard palate** is divided into primary and secondary parts by the incisive foramen, making the foramen the key anatomical landmark in this classification. - Defects in the **hard palate** can occur, but the classification system doesn't use the entire hard palate as its primary reference. *Third molar* - The **third molar** is irrelevant to the Kernahan's striped 'Y' classification of cleft lip and palate. - This classification focuses on midfacial structures and palatal development, not on tooth development or position.

Q: After how many days post skin grafting does revascularization and angiogenesis typically begin?

5. ***5*** - **Revascularization** and **angiogenesis** in a skin graft typically become well-established around **day 5** post-grafting. - While **inosculation** (direct anastomosis of vessels) may begin earlier around day 3-4, active **angiogenesis** (new vessel formation) is most prominent starting day 5. - This process involves the ingrowth of new blood vessels from the host bed into the graft, essential for its survival and integration. *4* - Day 4 marks the transition phase where **inosculation** is beginning and **plasmatic imbibition** is declining. - However, robust **angiogenesis** and active neovascularization are not yet fully established at this stage. - The graft is transitioning from passive diffusion to active vascular ingrowth. *6* - While revascularization is robust and well-established by day 6, the active initiation phase begins earlier around day 5. - Day 6 demonstrates a maturing vascular network, but the question asks about when the process typically begins. *7* - By day 7, the process of **revascularization** and **angiogenesis** is typically well-established and maturing. - The initial stages of capillary ingrowth and new vessel formation have already been completed by this point. - This represents the consolidation phase rather than the initiation phase.

Q: What is the ideal angle for Z-plasty?

60°. ***60°*** - An angle of **60°** is considered ideal for Z-plasty because it provides the best balance between **lengthening the scar** and maintaining **tissue viability**. - This angle typically results in a **75% gain in length** along the central limb of the Z-plasty, while ensuring the flaps have a broad enough base for adequate blood supply. *90°* - While a **90°** angle would provide the most lengthening (around 100%), it creates very **thin, narrow flap tips** that are highly susceptible to **ischemia and necrosis** due to compromised blood supply. - This angle is generally avoided in Z-plasty due to the high risk of **flap complications**. *45°* - A **45°** angle results in less lengthening (approximately 50% gain) compared to a 60° angle, which may not be sufficient for significant release of scar contractures. - While it offers excellent flap viability due to wider bases, the **suboptimal lengthening** makes it less efficient for many Z-plasty applications. *75°* - An angle of **75°** would yield greater lengthening than 60°, but it also compromises flap viability making the flap susceptible to **necrosis**. - The benefits of increased length are often outweighed by the increased **risk of complications** when using this angle.

Q: How much length is increased in Z-plasty when it is done at 60 degrees?

75%. ***75%*** - A **60-degree Z-plasty** lengthens the central limb by approximately **75%** of its original length. This configuration provides a balance between length gain and flap viability. - The greater the angle of the Z-plasty limbs, the greater the theoretical lengthening, but also the larger the flaps and the increased risk of complications. *25%* - A **30-degree Z-plasty** typically provides about **25% lengthening** of the central limb. This angle offers less lengthening but is useful for smaller scars or when skin mobility is limited. - While it provides some lengthening, it falls significantly short of the length achieved with a 60-degree Z-plasty. *50%* - A **45-degree Z-plasty** generally results in approximately **50% lengthening**. This is an intermediate option, providing moderate lengthening. - This option does not match the significant lengthening associated with the larger 60-degree angle. *100%* - To achieve approximately **100% length gain**, larger angles such as **75 or 90-degree Z-plasty** might be considered. However, these angles are less commonly used due to increased flap size and tension at the base. - A standard 60-degree Z-plasty does not provide a 100% increase in length.

Q: Unilateral cleft lip is repaired at what age?

3-6 months. ***3-6 months*** - Unilateral cleft lip repair is typically performed between **3 and 6 months of age**, following the rule of **10s** (10 pounds weight, 10 weeks old, 10 g/dL hemoglobin). - This timing allows for adequate **growth of facial structures** while still completing the repair before the child develops significant speech patterns. *1-3 months* - While some surgeons might consider earlier repair, this window is generally considered a bit **too early** given the child's small size and potential for respiratory compromise during anesthesia. - The **rule of 10s** is often not fully met by 1-3 months, which can increase surgical risks. *6-9 months* - This period is generally considered **too late** for initial cleft lip repair, as waiting longer can lead to more pronounced **psychosocial impact** and may interfere with early speech development. - Early muscle activity in an uncorrected cleft can also lead to more significant **nasal deformity**. *9-12 months* - Performing cleft lip repair this late is **not recommended** as it can negatively impact feeding, speech, and potential **social interaction** and bonding. - The optimal window for **cleft palate repair** is typically between 9 and 12 months, not cleft lip.

Q: Which of the following is NOT a characteristic of a youthful feminine smile?

Open incisor embrasure. ***Open incisor embrasure*** - An **open incisor embrasure** is typically associated with an aging smile or dental wear, where the interdental papilla may recede, or teeth become more rectangular. - A youthful feminine smile is characterized by well-defined, closed embrasures, contributing to a sense of **fullness and vitality**. *Softened facial line angles* - A **softened facial line angle** is a characteristic of a youthful feminine smile, contributing to a more rounded and gentle appearance. - This feature helps create harmony between the facial contours and the smile. *Golden proportion is followed* - The **golden proportion** is a mathematical ratio often associated with aesthetic beauty and is commonly observed in youthful and aesthetically pleasing smiles. - It relates to the visual harmony of individual tooth dimensions and their relationship within the overall smile. *Rounding of incisal line angles* - **Rounding of incisal line angles** contributes to a soft, feminine, and youthful appearance of the teeth. - This contrasts with sharp, angular incisal edges, which can appear more masculine or aged.

Q: What is the primary mechanism responsible for skin graft survival within the first 48 hours after transplantation?

Plasma imbibition. ***Correct: Plasma imbibition*** - **Plasma imbibition** is the initial process where the transplanted graft absorbs nutrients and oxygen from the recipient bed through diffusion. - This fluid uptake is crucial for the survival of the graft cells before revascularization occurs, typically within the first **24-48 hours**. - The graft acts like a sponge, absorbing serum and plasma from the vascular bed through capillary action and osmosis. *Incorrect: Amount of saline in graft* - While sterile saline is often used to keep donor tissue moist during harvesting and transport, its presence in the graft itself is not the primary mechanism for survival post-transplantation. - Excessive saline could even lead to **edema** and compromise graft take if not properly drained or if it prevents good contact with the recipient bed. *Incorrect: New vessels growing from the donor tissue* - Grafts themselves do not spontaneously grow new vessels; new blood vessels are formed by **angiogenesis** from the recipient bed into the graft over several days. - This process, called **inosculation** and subsequent neovascularization, provides long-term blood supply but is not the primary mechanism of survival within the *first 48 hours*. *Incorrect: Connection between donor and recipient capillaries* - The direct connection of donor and recipient capillaries (inosculation) is a later stage of graft vascularization, typically beginning after **3-5 days**, not within the first 48 hours. - Within the initial 48 hours, the graft relies on diffusion because a complete vascular connection has not yet been established.

Question 1

In Kernahan's striped 'Y' classification, what is the main reference point?

Accepted Answer

Incisive foramen

Answer

Soft palate

Answer

Hard palate

Answer

Third molar

Question 2

Which of the following is true about breast reconstruction surgery?

Accepted Answer

Simplest reconstruction is done using silicone gel implant

Answer

Nipple reconstruction cannot be performed under local anesthesia

Answer

Radiotherapy in post op period does not influence the outcome after breast reconstruction

Answer

TRAM flap has less donor site morbidity than LD flap

Question 3

After how many days post skin grafting does revascularization and angiogenesis typically begin?

Accepted Answer

5

Answer

4

Answer

6

Answer

7

Question 4

Which of the following statements is NOT true regarding tenosynovitis of the finger?

Accepted Answer

Fingers are more likely to be held in an extended position due to pain and swelling.

Answer

With involvement of the little finger, the infection does not spread to the index finger.

Answer

Treatment is not always conservative and may require surgical intervention in severe cases.

Answer

Tenosynovitis of the little finger can spread to the thumb but not to the ring finger.

Question 5

Which flap is commonly used in breast reconstruction?

Accepted Answer

DIEP based on deep inferior epigastric perforator vessels

Answer

Gluteal flap based on superior gluteal artery

Answer

Latissimus dorsi flap based on thoracodorsal artery

Answer

TRAM based on transverse rectus abdominis muscle

Question 6

What is the ideal angle for Z-plasty?

Accepted Answer

60°

Answer

90°

Answer

45°

Answer

75°

Question 7

How much length is increased in Z-plasty when it is done at 60 degrees?

Accepted Answer

75%

Answer

50%

Answer

25%

Answer

100%

Question 8

Unilateral cleft lip is repaired at what age?

Accepted Answer

3-6 months

Answer

1-3 months

Answer

6-9 months

Answer

9-12 months

Question 9

Which of the following is NOT a characteristic of a youthful feminine smile?

Accepted Answer

Open incisor embrasure

Answer

Softened facial line angles

Answer

Golden proportion is followed

Answer

Rounding of incisal line angles

Question 10

What is the primary mechanism responsible for skin graft survival within the first 48 hours after transplantation?

Accepted Answer

Plasma imbibition

Answer

Amount of saline in graft

Answer

New vessels growing from the donor tissue

Answer

Connection between donor and recipient capillaries

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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