Local Flaps and Soft Tissue Coverage — MCQs
Wound contraction can be most effectively minimized by:
Which of the following is the POOREST recipient bed for a skin graft?
When osseous defects amenable to reconstruction are present, technique of choice is?
Which muscle flap is commonly used for autologous breast reconstruction after mastectomy?
Abbe-Estlander flap is used in the reconstruction of:
The sternocleidomastoid muscle is supplied by all of the following arteries except?
A Young Male complained of intermittent pain, swelling and discharge at the base of spine. He also had episodes of fever and repeated abscesses that had burst spontaneously. By occupation, he is a jeep driver. Physical examination showed pilonidal sinus. Which flap-based procedure is used for pilonidal sinus surgery?
Longitudinal incision with Z-plasty closure is used in which of the following?
Most common complication of mastectomy is:
The Abbe flap is primarily used for the reconstruction of which anatomical structure?
Local Flaps and Soft Tissue Coverage Indian Medical PG Practice Questions and MCQs
Question 1: Wound contraction can be most effectively minimized by:
- A. Allowing secondary granulation
- B. Full thickness grafting (Correct Answer)
- C. Split skin graft
- D. Dressing with placenta
Explanation: ***Full thickness grafting*** - **Full-thickness skin grafts** include the epidermis and full dermis, which contains **fewer myofibroblasts** than split-thickness grafts, thus minimizing contraction. - The greater amount of dermal tissue acts as a **mechanical barrier** to prevent excessive wound contraction, providing a more stable and aesthetically pleasing result. *Allowing secondary granulation* - Healing by **secondary intention** involves substantial granulation tissue formation, which is rich in **myofibroblasts** and leads to significant wound contraction. - This method of healing is often used for infected or contaminated wounds but results in the **most contraction**. *Split skin graft* - **Split-thickness skin grafts** contain only a portion of the dermis, making them prone to **moderate to significant wound contraction**. - While better than secondary intention, the thin dermal layer provides less resistance to the contractile forces of the **myofibroblasts**. *Dressing with placenta* - **Placental tissue dressings** can promote wound healing by providing growth factors and a scaffold for regeneration. - However, they do not inherently prevent or minimize **wound contraction** in the same way that a full-thickness graft mechanically does, as they do not replace the entire dermal layer.
Question 2: Which of the following is the POOREST recipient bed for a skin graft?
- A. Fat (Correct Answer)
- B. Muscle
- C. Deep fascia
- D. Skull bone
Explanation: ***Fat*** - **Fat** is a poor recipient for a skin graft due to its **limited vascularity**, which hinders the necessary process of revascularization for graft survival. - The high metabolic demand of a graft cannot be adequately met by the relatively avascular subcutaneous fat, leading to graft failure. *Muscle* - **Muscle tissue** is an excellent recipient bed for skin grafts due to its **rich blood supply**. - Its robust vascularity effectively supports the revascularization and survival of the grafted tissue. *Deep fascia* - **Deep fascia** provides a good vascularized bed for skin grafts, as it has a reasonable blood supply from underlying muscles and surrounding tissues. - This vascularization is sufficient to nourish and ensure the take of a skin graft. *Skull bone* - **Skull bone** (specifically the periosteum covering it) can serve as an adequate graft bed due to its vascular supply. - If the **periosteum** is intact and healthy, it offers sufficient blood flow for graft survival.
Question 3: When osseous defects amenable to reconstruction are present, technique of choice is?
- A. Sulcular flap
- B. Modified Widman flap
- C. Apically displaced flap
- D. Papilla preservation flap (Correct Answer)
Explanation: ***Papilla preservation flap*** - This technique is specifically designed to **preserve the interdental papilla**, which is critical for covering and protecting regenerative materials placed in osseous defects. - By maintaining the integrity of the papilla, it facilitates primary wound closure over the defect, enhancing the predictability of **guided tissue regeneration (GTR)** and bone grafting procedures. *Sulcular flap* - A sulcular flap involves an incision within the sulcus, which typically provides limited access and does not allow for adequate coverage of large **osseous defects**. - It does not offer the tissue volume needed for the stable primary closure essential for regenerative procedures. *Modified Widman flap* - While providing excellent access for debridement in periodontal pockets, the modified Widman flap's incisions often **transect the interdental papilla**, making primary closure over a regenerative defect less ideal. - Its primary goal is root debridement and pocket reduction, not necessarily **papilla preservation** for regenerative purposes. *Apically displaced flap* - An apically displaced flap is designed to **increase the zone of attached gingiva** or reduce pocket depths, by positioning the flap apically to its original position. - This flap design is not suitable for covering osseous defects amenable to reconstruction because it often exposes more root surface and does not provide the necessary coronal coverage for regenerative materials.
Question 4: Which muscle flap is commonly used for autologous breast reconstruction after mastectomy?
- A. Deltopectoral
- B. Serratus anterior
- C. Trapezius
- D. Latissimus dorsi (Correct Answer)
Explanation: ***Latissimus dorsi*** - The **latissimus dorsi** muscle is commonly used in **autologous breast reconstruction** due to its rich blood supply and ample tissue volume which can be transferred as a **pedicled flap** to the chest. - This flap includes muscle, skin, and subcutaneous fat, providing a good aesthetic outcome for **breast mound reconstruction** after mastectomy. *Deltopectoral* - The **deltopectoral flap** is primarily used for **head and neck reconstruction**, specifically for oral cavity and pharyngeal defects. - It involves muscle and skin from the **chest and shoulder region**, but its size and location make it less suitable for comprehensive breast reconstruction. *Serratus anterior* - The **serratus anterior** muscle is occasionally used as a **free flap** for small soft tissue defects, but it is not typically the first choice for large-volume breast reconstruction. - Its primary role is in **shoulder movement** and it does not provide sufficient tissue bulk for a complete breast mound. *Trapezius* - The **trapezius flap** is more commonly employed in **head and neck reconstruction** or for covering defects in the posterior shoulder region. - While it offers a good blood supply, its bulk and orientation are not ideal for **breast reconstruction**, which requires a more anterior and hemispheric shape.
Question 5: Abbe-Estlander flap is used in the reconstruction of:
- A. Buccal mucosa
- B. Lip (Correct Answer)
- C. Tongue
- D. Palate
Explanation: ***Lip*** - The **Abbe-Estlander flap** is a **cross-lip flap** used for reconstructing defects of the lip, typically involving more than one-third of its length. - It involves transferring tissue from the opposite lip to repair the defect, preserving both **oral competence** and **cosmetic appearance**. *Buccal mucosa* - Reconstruction of the buccal mucosa often involves **local flaps** (e.g., from the adjacent soft palate or gingiva) or **free flaps** (e.g., radial forearm free flap) for larger defects. - The Abbe-Estlander flap is not suitable for intraoral buccal mucosa reconstruction as it is designed for external lip defects. *Tongue* - Tongue reconstruction is complex and typically involves **local flaps** (e.g., from the floor of the mouth or buccal mucosa) or **free flaps** (e.g., radial forearm, anterolateral thigh) to restore mobility and function. - The Abbe-Estlander flap is specifically designed for lip repair and lacks the necessary bulk or vascular pedicle for tongue reconstruction. *Palate* - Palate reconstruction, especially for large defects, often requires **local flaps** (e.g., buccal fat pad, vomer flap) or **free flaps** (e.g., radial forearm, rectus abdominis) to restore separation between the oral and nasal cavities. - The Abbe-Estlander flap is a mucocutaneous flap from the lip and is anatomically and functionally inappropriate for palatal reconstruction.
Question 6: The sternocleidomastoid muscle is supplied by all of the following arteries except?
- A. Occipital
- B. Thyrocervical trunk
- C. Posterior auricular (Correct Answer)
- D. Superior thyroid
Explanation: ***Posterior auricular*** - The **posterior auricular artery** is a branch of the external carotid artery that primarily supplies structures **behind the ear** including the scalp, auricle, and parotid region. - It does **NOT** provide blood supply to the sternocleidomastoid muscle. - This artery ascends behind the ear and is not involved in the vascular supply of the SCM. *Occipital* - The **occipital artery**, a branch of the external carotid artery, provides a significant blood supply to the sternocleidomastoid muscle. - It specifically has a **sternocleidomastoid branch** that arises near the lower part of the muscle. - This is one of the main arterial supplies to the SCM. *Superior thyroid* - The **superior thyroid artery**, the first branch of the external carotid artery, gives off a **sternocleidomastoid branch** that supplies the upper part of the muscle. - While primarily known for supplying the thyroid gland, its muscular branches contribute to SCM vascularization. *Thyrocervical trunk* - The **thyrocervical trunk** (from the subclavian artery) gives rise to the **suprascapular artery**, which provides blood supply to the sternocleidomastoid muscle. - The suprascapular artery supplies the middle and deep portions of the SCM. - Other branches of the thyrocervical trunk include the inferior thyroid and transverse cervical arteries.
Question 7: A Young Male complained of intermittent pain, swelling and discharge at the base of spine. He also had episodes of fever and repeated abscesses that had burst spontaneously. By occupation, he is a jeep driver. Physical examination showed pilonidal sinus. Which flap-based procedure is used for pilonidal sinus surgery?
- A. Rhomboid flap (Correct Answer)
- B. Free flap
- C. Rotational flap
- D. Circular flap
Explanation: ***Rhomboid flap*** - The **rhomboid flap** (**Limberg flap**) is a common and effective surgical technique for pilonidal sinus, offering good wound closure and reduced recurrence rates. - It involves excising the sinus tract *en bloc* and closing the defect with a **rhomboid-shaped skin flap**, which distributes tension evenly. - This is a **transposition flap** that moves tissue laterally into the defect while maintaining blood supply. *Free flap* - **Free flaps** involve transplanting tissue with its own blood supply from one part of the body to another using microsurgery. - This method is overly complex and unnecessary for a typical pilonidal sinus repair, which usually only requires local tissue rearrangement. *Rotational flap* - A **rotational flap** is a type of local flap where tissue is rotated on a pivot point to cover a defect. - While rotational flaps (such as the **Karydakis flap**) can be used for pilonidal sinus surgery, the **rhomboid flap** is more commonly referenced as the standard flap-based technique due to its reliable outcomes and specific geometric design. - The rhomboid flap is technically a **transposition flap**, not a rotational flap, though both are local tissue rearrangement techniques. *Circular flap* - **Circular flaps** are generally not a standard design for closing excisional defects, especially in areas like the sacrococcygeal region where linear tension and dead space management are crucial. - Such a flap would likely create dog-ears and poor cosmetic outcomes, making it unsuitable for pilonidal sinus surgery.
Question 8: Longitudinal incision with Z-plasty closure is used in which of the following?
- A. Hand surgery (Correct Answer)
- B. Thyroid surgery
- C. Breast reconstruction surgery
- D. Hernia repair surgery
Explanation: ***Hand surgery*** - **Z-plasty** is frequently employed in hand surgery to **lengthen constricted scars** or to **reorient tension lines**, especially across joints or creases. - This technique helps to improve **range of motion** and prevent contractures that can severely impair hand function following injury or surgery. *Breast reconstruction surgery* - While various flap techniques are used in breast reconstruction, the primary incision or closure does not typically involve a **longitudinal incision with Z-plasty**. - Procedures often focus on re-shaping and volume replacement using **tissue flaps** or implants, or linear scar realignment for aesthetic purposes. *Thyroid surgery* - Thyroidectomy typically involves a **transverse incision** in the neck (a **Kocher collar incision**) to minimize visible scarring and follow natural skin folds. - **Z-plasty** is not a standard technique for closing the primary incision in thyroid surgery. *Hernia repair surgery* - Hernia repair usually involves a **linear or curvilinear incision** in the groin or abdominal wall, followed by direct closure or mesh placement. - The goal is strong tissue repair, and **Z-plasty** is not used as a closure method for the primary incision in hernia repair.
Question 9: Most common complication of mastectomy is:
- A. Seroma (Correct Answer)
- B. Hemorrhage
- C. Infection
- D. Lymphedema
Explanation: ***Seroma*** - **Seroma** formation is the most common complication after mastectomy, involving the accumulation of serous fluid in the surgical dead space. - This complication can lead to discomfort, delayed wound healing, and an increased risk of infection. *Hemorrhage* - While a serious complication, **hemorrhage** is less common than seroma formation. - Significant hemorrhage usually occurs intraoperatively or in the immediate postoperative period and is typically managed promptly. *Lymphedema* - **Lymphedema** is a chronic condition characterized by swelling of the arm due to impaired lymphatic drainage, often developing months to years after surgery. - Although highly significant and debilitating, its incidence is lower than acute complications like seroma. *Infection* - Surgical site **infection** is a potential complication but is generally less frequent than seroma due to careful aseptic techniques and prophylactic antibiotics. - Infections can range from superficial wound infections to more serious cellulitis.
Question 10: The Abbe flap is primarily used for the reconstruction of which anatomical structure?
- A. Reconstruction of the lip (Correct Answer)
- B. Reconstruction of the eyelid
- C. Reconstruction of the tongue
- D. Reconstruction of the ear
Explanation: ***Reconstruction of the lip*** - The **Abbe flap** is a classic technique used for **lip reconstruction**, particularly for defects involving the full thickness of the lip. - It involves transferring tissue from one lip to the other to restore **oral competence**, **function**, and **aesthetics**. *Reconstruction of the eyelid* - Eyelid reconstruction often uses techniques like **Tenzel flaps** or **Hughes flaps**, which are specifically designed for the periorbital area. - The Abbe flap is not typically used for eyelid reconstruction due to differences in tissue characteristics and functional requirements. *Reconstruction of the tongue* - Tongue reconstruction usually involves **free flaps** such as the **radial forearm flap** or **anterolateral thigh flap**, chosen for their bulk and vascularity. - These flaps provide the necessary tissue volume and mobility for tongue function, which the Abbe flap cannot adequately achieve. *Reconstruction of the ear* - Ear reconstruction commonly employs rib cartilage grafts or local skin flaps like the **preauricular flap** or **postauricular flap** to recreate ear contours. - The delicate structure and specific cartilage requirements of ear reconstruction make the Abbe flap unsuitable for this purpose.
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