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?
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?
Chassar Moir technique is used in
In which of the following conditions is the Kocher-Langenbeck approach for emergency acetabular fixation contraindicated?
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: 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 6: 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 7: 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 8: 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.
Question 9: Chassar Moir technique is used in
- A. Enterocoele repair
- B. Urethrocoele
- C. Vesico vaginal fistula (Correct Answer)
- D. Stress incontinence
Explanation: ***Vesico vaginal fistula*** - The Chassar Moir technique is a surgical approach specifically designed for the repair of **vesicovaginal fistulae**, which are abnormal communications between the bladder and the vagina. - This technique primarily utilizes a **transvaginal approach** to close the fistula, often involving excision of the tract and multi-layered closure. *Enterocoele repair* - Enterocoele repair involves addressing a herniation of the **peritoneum and small bowel** into the rectovaginal space. - While it's a pelvic floor repair, it's distinct from fistula repair; various techniques like sacrocolpopexy or colporrhaphy are used, not typically the Chassar Moir. *Urethrocoele* - A urethrocoele (or urethrocele) is a **herniation of the urethra** into the vagina, usually due to weakening of pelvic floor support. - Its repair focuses on supporting the urethra, often through anterior colporrhaphy, and not directly related to the Chassar Moir technique. *Stress incontinence* - Stress urinary incontinence is the involuntary leakage of urine with physical activity, often due to **urethral hypermobility** or **intrinsic sphincter deficiency**. - Surgical treatments include mid-urethral slings or colposuspension, which are entirely different procedures from the Chassar Moir technique for fistula repair.
Question 10: In which of the following conditions is the Kocher-Langenbeck approach for emergency acetabular fixation contraindicated?
- A. Morel - Lavallee lesion (Correct Answer)
- B. Progressive sciatic nerve injury
- C. Open fracture
- D. Recurrent dislocation despite closed reduction and traction
Explanation: ***Morel - Lavallee lesion*** - A Morel-Lavallee lesion is a **closed degloving injury** where the skin and subcutaneous tissue are avulsed from the underlying fascia, creating a potential space that fills with hematoma, fat, and lymphatic fluid. - The **Kocher-Langenbeck approach** involves significant soft tissue dissection, which increases the risk of **wound complications**, infection, and flap necrosis in an already compromised and devascularized soft tissue envelope found in a Morel-Lavallee lesion. *Open fracture* - An **open fracture** involves a break in the skin, exposing the fracture site, which significantly increases the risk of infection. - While it presents a challenge, an open fracture is generally a **stronger indication for urgent surgical stabilization** to prevent further contamination and promote healing, rather than a contraindication to a specific surgical approach if it's the most appropriate for the fracture pattern. *Progressive sciatic nerve injury* - **Progressive neurologic deficits**, including sciatic nerve injury, often necessitate urgent surgical intervention to decompress the nerve and prevent irreversible damage. - This symptom emphasizes the **urgency of surgical stabilization** and internal fixation for the acetabular fracture, making it an indication for rather than a contraindication to the Kocher-Langenbeck approach if it provides optimal access. *Recurrent dislocation despite closed reduction and traction* - **Instability** of the hip joint despite conservative measures indicates a need for surgical intervention to achieve stable reduction and fixation of the acetabular fracture. - This situation generally **supports the need for open reduction and internal fixation**, often via approaches like Kocher-Langenbeck, to restore joint congruity and stability, making it an indication, not a contraindication.
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