Soft Tissue Injuries — MCQs
Most common site of myositis ossificans ?
Which of the following is/are characteristic features of chronic inflammation?
Histology of Myositis ossificans most closely mimics which of the following?
Ulnar nerve injury results in:
A football player experienced a twist in the ankle and knee. Clinically, no bone injury was appreciated. The examiner is performing the test shown in the image. Which test is this?
A 45-year-old woman presents with severe shoulder pain after a fall, and examination reveals a dislocated shoulder. What is the initial management?
What is the Essex-Lopresti lesion in the upper limb?
In which of the following conditions is the Kocher-Langenbeck approach for emergency acetabular fixation contraindicated?
Most sensitive investigation for abdominal trauma in a hemodynamically stable patient is-
A moving vehicle hits a pedestrian on his lateral aspect of the knee and causes a fracture. The fracture line is passing through the intercondylar eminence. Which of the following structures will most likely be injured
Soft Tissue Injuries Indian Medical PG Practice Questions and MCQs
Question 1: Most common site of myositis ossificans ?
- A. Shoulder
- B. Wrist
- C. Quadriceps/Thigh (Correct Answer)
- D. Elbow
Explanation: ***Quadriceps/Thigh*** - The **quadriceps and thigh** muscles are frequently affected due to their common involvement in sports injuries and trauma. - This region is prone to **hematoma formation** after contusions, which can predispose to ectopic bone formation. *Shoulder* - While the shoulder can be affected by myositis ossificans, it is **less common** than the quadriceps. - Traumatic myositis ossificans in the shoulder typically involves the **deltoid muscle**. *Wrist* - Myositis ossificans of the **wrist is rare** and usually occurs after severe trauma or crush injuries. - The small muscle mass and limited direct trauma to the wrist muscles make it an **unlikely primary site**. *Elbow* - Myositis ossificans can occur around the elbow, particularly in the **brachialis muscle**, often following dislocations or fractures. - However, the elbow is still **less commonly affected overall** compared to the large muscle groups of the thigh.
Question 2: Which of the following is/are characteristic features of chronic inflammation?
- A. Infiltration of neutrophils
- B. Tissue fibrosis and lymphocyte infiltration (Correct Answer)
- C. Increased blood flow (hyperemia)
- D. Presence of fluid accumulation (edema) in tissues
Explanation: ***Tissue fibrosis and lymphocyte infiltration*** - **Chronic inflammation** is characterized by the persistent presence of lymphocytes, plasma cells, and macrophages as the predominant inflammatory cells [1]. - **Tissue fibrosis** (scarring) and destruction are hallmarks of chronic inflammation as the body attempts to repair ongoing damage, often leading to loss of organ function [1]. *Infiltration of neutrophils* - **Neutrophils** are the primary inflammatory cells seen in **acute inflammation**, being the first responders to injury or infection [2]. - Their presence typically signifies an active, recent inflammatory process, usually resolving within hours to days. *Increased blood flow (hyperemia)* - **Hyperemia** is a classic sign of **acute inflammation**, contributing to the **redness and warmth** observed at the site. - While some vascular changes can persist in chronic inflammation, pronounced and primary hyperemia is characteristic of the acute phase. *Presence of fluid accumulation (edema) in tissues* - **Edema** primarily results from increased vascular permeability, a key feature of **acute inflammation**, causing swelling [2]. - While some edema may be present in chronic inflammation due to persistent vascular leakage, it is a dominant feature of acute inflammatory responses. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 109-110. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 103-104.
Question 3: Histology of Myositis ossificans most closely mimics which of the following?
- A. Giant Cell Tumor
- B. Ewing's tumor
- C. Osteochondroma
- D. Osteosarcoma (Correct Answer)
Explanation: ***Osteosarcoma*** - Histologically, myositis ossificans can mimic **osteosarcoma**, as both conditions show features of **ossification and bone formation** [1]. - **Age** and **location** may also help differentiate, but careful histological examination reveals similarities. *Osteochondroma* - Characterized by a **cartilaginous cap** overlying the bone, which is not present in myositis ossificans [2]. - Usually develops in patients with a **pedunculated or sessile base**, rather than the heterogeneous ossification seen in myositis ossificans. *Ewing's tumour* - This is a **malignant round cell tumor** that predominantly affects children and young adults, with specific **translocation** genetic features. - Histologically, it shows a **small, blue cell appearance**, distinct from the fibroblastic reaction and bone formation seen in myositis ossificans. *GCT* - Granulosa cell tumors (GCT) are primarily **gynecological**, with no significant **bony changes** as seen in myositis ossificans. - Histologically, GCTs show **multinucleated giant cells** and are associated with **subarticular bone lesions**, unlike the heterotopic ossification seen in myositis ossificans. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 672-673.
Question 4: Ulnar nerve injury results in:
- A. Pointing index
- B. Ape thumb deformity
- C. Clawing of fingers (Correct Answer)
- D. Wrist drop
Explanation: ***Clawing of fingers*** - An ulnar nerve injury, particularly at the elbow, often leads to **paralysis of the interossei muscles** and the **medial two lumbricals**. [1] - This results in **hyperextension at the metacarpophalangeal joints** and **flexion at the interphalangeal joints** of the 4th and 5th fingers (and sometimes 3rd), creating the characteristic claw hand deformity. [1] *Pointing index* - **Pointing index**, also known as the **sign of benediction** or **preacher's hand**, occurs with **high median nerve lesions** affecting the lateral lumbricals and flexor digitorum superficialis. - The patient is unable to flex the index and middle fingers, especially when attempting to make a fist. *Ape thumb deformity* - **Ape thumb deformity** is caused by a **median nerve injury**, specifically affecting the **thenar muscles** (abductor pollicis brevis, opponens pollicis, and superficial head of flexor pollicis brevis). - This paralysis leads to the thumb being pulled laterally and into the same plane as the other fingers, losing its ability to oppose. *Wrist drop* - **Wrist drop** is a classic sign of **radial nerve injury**, which paralyzes the **extensor muscles of the wrist and fingers**. - This prevents the patient from extending their wrist and metacarpophalangeal joints.
Question 5: A football player experienced a twist in the ankle and knee. Clinically, no bone injury was appreciated. The examiner is performing the test shown in the image. Which test is this?
- A. Posterior drawer for PCL
- B. McMurray
- C. Lachman (Correct Answer)
- D. Anterior drawer for ACL
Explanation: ***Lachman*** - The image shows the examiner holding the distal thigh and proximal tibia, with the knee flexed at a **20-30 degree angle**, applying an **anterior translational force** to the tibia. This specific maneuver is characteristic of the Lachman test. - The Lachman test is highly sensitive for detecting **anterior cruciate ligament (ACL) tears**, particularly in acute injuries, due to the reduced hamstring spasm compared to the anterior drawer test. *Posterior drawer for PCL* - The posterior drawer test involves flexing the knee to **90 degrees** and applying a **posterior force** to the tibia to assess the integrity of the **posterior cruciate ligament (PCL)**. - The position of the knee in the image (flexed at a shallower angle) and the direction of the applied force (anteriorly towards the femur) do not match the technique for a posterior drawer test. *McMurray* - The McMurray test is performed to evaluate **meniscal tears** by flexing, extending, and rotating the knee while applying a varus or valgus stress. - The maneuver in the image, involving direct anterior translation of the tibia with the knee in slight flexion, is not consistent with the McMurray test. *Anterior drawer for ACL* - While also testing the **ACL**, the anterior drawer test typically involves flexing the knee to **90 degrees** and sitting on the foot, then pulling the tibia anteriorly. - The knee flexion angle in the image is much shallower than 90 degrees, making it inconsistent with the standard anterior drawer test.
Question 6: A 45-year-old woman presents with severe shoulder pain after a fall, and examination reveals a dislocated shoulder. What is the initial management?
- A. Sling and swathe immobilization
- B. Open reduction
- C. Closed reduction (Correct Answer)
- D. MRI of the shoulder
Explanation: ***Closed reduction*** - **Closed reduction** is the initial and preferred treatment for an anterior shoulder dislocation, aiming to restore the humeral head to the glenoid cavity **without surgical incision**. - This procedure should be performed promptly to minimize pain, muscle spasm, and the risk of **neurovascular compromise** in the affected limb. *Sling and swathe immobilization* - While immobilization is required *after* a successful reduction, it is not the *initial* management for a dislocated shoulder itself. - Immobilization *without* prior reduction would leave the shoulder dislocated, leading to ongoing pain and potential long-term complications. *Open reduction* - **Open reduction**, which involves surgical incision, is generally reserved for cases where **closed reduction fails** or if there are associated complex injuries, such as significant fractures not amenable to closed management. - It is not the initial treatment strategy for an uncomplicated shoulder dislocation. *MRI of the shoulder* - An **MRI** may be indicated to evaluate associated soft tissue injuries (e.g., **rotator cuff tears**, **labral tears**) *after* the shoulder has been reduced and initial radiographs have been obtained. - It is not part of the immediate management for pain relief and joint repositioning in an acute dislocation.
Question 7: What is the Essex-Lopresti lesion in the upper limb?
- A. Isolated radial head fracture without soft tissue involvement
- B. Radial shaft
- C. Comminuted radial head fracture with interosseous membrane disruption and DRUJ instability (Correct Answer)
- D. Radial shaft and radio-ulnar joint fracture
Explanation: ***Comminuted radial head fracture with interosseous membrane disruption and DRUJ instability*** - The Essex-Lopresti lesion is a severe injury characterized by a **comminuted radial head fracture**, **disruption of the interosseous membrane** (IOM), and eventual **distal radioulnar joint (DRUJ) instability**. - This complex injury can lead to significant **forearm instability**, pain, and loss of function due to the disruption of the forearm's longitudinal stability. *Isolated radial head fracture without soft tissue involvement* - This describes a less severe injury, typically classified as a **Mason type I or II radial head fracture**, where the soft tissue structures like the interosseous membrane and DRUJ are intact. - An isolated radial head fracture lacks the characteristic **longitudinal instability** of the Essex-Lopresti lesion, which is critical for its diagnosis. *Radial shaft* - A radial shaft fracture involves the **diaphysis of the radius** and is a different type of injury that does not inherently include a radial head fracture or interosseous membrane disruption as seen in Essex-Lopresti. - While a radial shaft fracture can occur, it's typically a **more localized injury** to the shaft itself and does not define the systemic instability of an Essex-Lopresti lesion. *Radial shaft and radio-ulnar joint fracture* - This description is vague and does not specifically capture the key components of an Essex-Lopresti injury which include the **radial head fracture**, **interosseous membrane disruption**, and resultant **DRUJ instability**. - A fracture of the radio-ulnar joint could refer to several different types of injuries but without mentioning the comminuted radial head fracture and interosseous membrane disruption, it misses the precise definition of an Essex-Lopresti lesion.
Question 8: 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.
Question 9: Most sensitive investigation for abdominal trauma in a hemodynamically stable patient is-
- A. Ultrasonography (FAST)
- B. Diagnostic peritoneal lavage (DPL)
- C. MRI (Magnetic Resonance Imaging)
- D. CT Scan (Computed Tomography) (Correct Answer)
Explanation: ***CT Scan (Computed Tomography)*** - **CT scans** offer superior anatomical detail and can accurately detect organ damage, hemorrhage, and other injuries in **hemodynamically stable** patients with abdominal trauma. - It is considered the **most sensitive** and specific imaging modality for evaluating blunt and penetrating abdominal trauma when the patient can tolerate the study. *Ultrasonography (FAST)* - While effective for detecting **free fluid** (blood) in specific abdominal areas, **Focused Assessment with Sonography for Trauma (FAST)** has lower sensitivity for solid organ injuries or bowel perforations. - Its primary role is rapid assessment for **hemoperitoneum** to guide immediate management in unstable patients, not detailed injury characterization. *Diagnostic peritoneal lavage (DPL)* - **DPL** is an invasive procedure with high sensitivity for detecting **intraperitoneal bleeding**, but it does not identify specific organ injuries or retroperitoneal hemorrhage. - It is rarely used in hemodynamically stable patients due to its invasiveness and the availability of more detailed imaging techniques. *MRI (Magnetic Resonance Imaging)* - **MRI** provides excellent soft tissue contrast but is typically too **time-consuming** and less accessible in urgent trauma settings compared to CT. - It's generally not the first-line investigation for acute abdominal trauma due to motion artifacts and limited utility in detecting air or bone injuries.
Question 10: A moving vehicle hits a pedestrian on his lateral aspect of the knee and causes a fracture. The fracture line is passing through the intercondylar eminence. Which of the following structures will most likely be injured
- A. Medial collateral ligament
- B. Medial meniscus
- C. Anterior cruciate ligament (Correct Answer)
- D. Lateral collateral ligament
Explanation: ***Anterior cruciate ligament*** - A fracture of the **intercondylar eminence** typically involves the avulsion of the **tibial attachment** of the anterior cruciate ligament (ACL). - The ACL's fibers attach to the **tibial intercondylar area**, making it highly susceptible to injury with a fracture in this region. *Medial collateral ligament* - The **medial collateral ligament** (MCL) originates from the medial femoral epicondyle and attaches to the medial tibia, primarily resisting valgus forces. - While knee trauma can affect the MCL, a fracture of the intercondylar eminence specifically points to an injury involving a structure attached to that area. *Medial meniscus* - The **medial meniscus** is a C-shaped cartilage in the knee joint and can be injured by rotational forces or compression. - Its injury is not directly linked to an intercondylar eminence fracture, although severe trauma can injure multiple structures. *Lateral collateral ligament* - The **lateral collateral ligament** (LCL) originates from the lateral femoral epicondyle and attaches to the fibular head, resisting varus forces. - An injury to the LCL is less likely with an intercondylar eminence fracture, as the LCL does not attach to this specific tibial region.
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