Lower Limb Practice Questions

Q: Which of the following is true about the medial meniscus?

C-shaped. ### Explanation **Correct Answer: C. C-shaped** The **medial meniscus** is a fibrocartilaginous disc located within the knee joint. It is characterized by its **large, semicircular, or "C-shaped"** appearance. In contrast, the lateral meniscus is more circular (nearly a complete ring) and smaller in diameter. #### Analysis of Options: * **A. Made up of hyaline cartilage:** This is incorrect. Menisci are composed of **fibrocartilage**, which provides high tensile strength and elasticity to withstand compressive loads. Hyaline cartilage covers the articular surfaces of the bones, not the menisci themselves. * **B. Injury of the lateral meniscus is more frequent:** This is incorrect. The **medial meniscus is injured 20 times more frequently** than the lateral meniscus. This is because the medial meniscus is firmly attached to the **Medial Collateral Ligament (MCL)** and the joint capsule, making it less mobile and more prone to tearing during rotational stress. * **D. Inner part is more avascular:** While this statement is technically a physiological fact (the inner 2/3rd is avascular and the outer 1/3rd is vascular), it is often considered a general property of *both* menisci. In the context of this specific question, "C-shaped" is the definitive anatomical descriptor that distinguishes the medial from the lateral meniscus. #### NEET-PG High-Yield Pearls: * **Shape:** Medial = C-shaped; Lateral = O-shaped (Circular). * **Mobility:** The lateral meniscus is more mobile because it is not attached to the Lateral Collateral Ligament (separated by the Popliteus tendon). * **Unhappy Triad of O'Donoghue:** Simultaneous injury to the **Anterior Cruciate Ligament (ACL)**, **Medial Collateral Ligament (MCL)**, and **Medial Meniscus**. * **Blood Supply:** The peripheral "Red Zone" has a good blood supply (healing possible), while the central "White Zone" is avascular (requires excision/meniscectomy).

Q: Which of the following is NOT true about the femoral nerve?

Its root value is L2-L5.. **Explanation:** The **femoral nerve** is the largest branch of the lumbar plexus and serves as the primary nerve of the anterior compartment of the thigh. **1. Why Option D is the correct answer (The False Statement):** The root value of the femoral nerve is **L2, L3, and L4** (posterior divisions of the ventral rami). It does not involve L5. In the NEET-PG context, root values are high-yield; for instance, the Obturator nerve also shares the L2-L4 roots but arises from the *anterior* divisions. **2. Analysis of Incorrect Options (True Statements):** * **Option A:** The femoral sheath contains the femoral artery, femoral vein, and the femoral canal (lymphatics). The **femoral nerve lies lateral to and outside the sheath**, separated from the vessels by the iliac fascia. * **Option B:** The **saphenous nerve** is indeed the longest and largest cutaneous branch of the femoral nerve. It accompanies the femoral artery in the adductor canal and provides sensation to the medial side of the leg and foot. * **Option C:** The femoral nerve provides vascular branches to the **femoral artery** and its branches, regulating vasomotor tone. **Clinical Pearls for NEET-PG:** * **Nerve Injury:** Injury to the femoral nerve (e.g., by pelvic fractures or hematomas) leads to wasting of the quadriceps, loss of knee extension, and loss of the **patellar reflex (L3-L4)**. * **Meralgia Paraesthetica:** This involves the *Lateral Cutaneous Nerve of Thigh* (L2-L3), not the femoral nerve. * **Hilton’s Law:** The femoral nerve supplies the hip and knee joints, explaining why hip pathology often presents as referred pain to the knee.

Q: A 42-year-old mother of three children visits the outpatient clinic complaining that her youngest son cannot walk yet. Radiographic and physical examinations reveal an unstable hip joint. Which of the following ligaments is responsible for stabilization of the hip joint in childhood?

Ligament of the head of the femur. **Explanation:** The **ligament of the head of the femur** (ligamentum teres) is a triangular, somewhat flattened band that extends from the acetabular notch to the fovea capitis of the femur. **Why it is correct:** In early childhood, the ligament of the head of the femur plays a critical role in hip stability. It contains the **acetabular branch of the obturator artery**, which is the primary blood supply to the epiphysis of the femoral head before the medial and lateral circumflex arteries fully take over this role. Damage or laxity of this ligament in a child can lead to joint instability and potential avascular necrosis. While its mechanical stabilizing role diminishes in adults, it remains a vital structure during the developmental years. **Why the other options are incorrect:** * **A, B, and C (Iliofemoral, Pubofemoral, Ischiofemoral):** These are the three major extracapsular ligaments of the hip. While they provide significant stability in adults (especially the **Iliofemoral ligament**, which is the strongest ligament in the body and prevents hyperextension), they are not the primary structures responsible for the specific developmental stability and vascular integrity required in early childhood. **High-Yield Clinical Pearls for NEET-PG:** * **Iliofemoral Ligament (Y-ligament of Bigelow):** Strongest ligament in the body; prevents hyperextension of the hip. * **Ischiofemoral Ligament:** Weakest of the three extracapsular ligaments; limits internal rotation. * **Blood Supply:** In adults, the main blood supply to the femoral head is the **medial circumflex femoral artery** (via retinacular arteries). In children, the artery within the ligamentum teres is crucial. * **Clinical Correlation:** Damage to the acetabular branch in the ligamentum teres during childhood can lead to **Legg-Calvé-Perthes disease**.

Q: Which artery supplies the gluteus medius muscle?

Superior gluteal artery. **Explanation:** The **superior gluteal artery (SGA)** is the largest branch of the internal iliac artery. It exits the pelvis through the greater sciatic foramen, passing superior to the piriformis muscle. It divides into a superficial branch (supplying the gluteus maximus) and a **deep branch**, which runs between the gluteus medius and minimus, providing the primary blood supply to both these muscles as well as the tensor fasciae latae. **Analysis of Incorrect Options:** * **Obturator artery:** A branch of the internal iliac artery that passes through the obturator canal to supply the medial compartment (adductors) of the thigh and the head of the femur via the ligamentum teres. * **Ilio-inguinal artery:** This is a distractor; the *ilio-inguinal* is a nerve (L1), not an artery. The *iliolumbar* artery exists but supplies the iliacus and psoas muscles. * **Inferior gluteal artery:** While it also exits the greater sciatic foramen (inferior to the piriformis), it primarily supplies the **gluteus maximus**, the pelvic diaphragm, and the proximal hamstrings. **High-Yield Clinical Pearls for NEET-PG:** * **The Piriformis Landmark:** The piriformis is the "key" muscle of the gluteal region. The **Superior** gluteal artery/nerve exit **above** it, while the **Inferior** gluteal artery/nerve and the **Sciatic nerve** exit **below** it. * **Trendelenburg Sign:** The superior gluteal **nerve** (which accompanies the artery) innervates the gluteus medius and minimus. Injury to this nerve leads to a positive Trendelenburg sign (pelvic tilt toward the unsupported side during walking). * **Cruciate Anastomosis:** The inferior gluteal artery participates in the cruciate anastomosis of the thigh, providing collateral circulation between the internal iliac and femoral systems.

Q: The stability of the ankle joint is maintained by all of the following, except?

Plantar calcaneonavicular (spring) ligament. **Explanation:** The ankle joint (talocrural joint) is a hinge-type synovial joint. Its stability is primarily maintained by the bony architecture of the mortise and strong collateral ligaments. **Why Option A is the correct answer:** The **Plantar calcaneonavicular (spring) ligament** is the primary stabilizer of the **medial longitudinal arch of the foot** and the **talocalcaneonavicular joint**. It supports the head of the talus but does not directly cross or stabilize the ankle joint (talocrural joint) itself. Therefore, it is the "except" in this list. **Analysis of Incorrect Options:** * **Deltoid Ligament (Option B):** This is a very strong, triangular medial ligament of the ankle. It prevents over-eversion and is a major stabilizer of the ankle joint. * **Lateral Ligament (Option C):** Comprising the anterior talofibular (ATFL), posterior talofibular (PTFL), and calcaneofibular (CFL) ligaments, it stabilizes the lateral aspect of the ankle against over-inversion. * **Shape of the superior talar articular surface (Option D):** The trochlea of the talus is wider anteriorly than posteriorly. During dorsiflexion, the wider anterior part wedges into the malleolar mortise, providing maximum bony stability to the joint. **High-Yield Clinical Pearls for NEET-PG:** * **Most common ankle injury:** Inversion sprain, usually involving the **Anterior Talofibular Ligament (ATFL)**. * **Strongest ligament:** The Deltoid ligament is so strong that forced eversion often results in an avulsion fracture of the medial malleolus (Pott’s fracture) rather than a ligament tear. * **Stability:** The ankle joint is most stable in **dorsiflexion** and least stable in **plantarflexion**.

Q: Where is the fabella typically present?

Lateral head of gastrocnemius. ### Explanation **Correct Answer: B. Lateral head of gastrocnemius** The **fabella** is a small sesamoid bone (a bone embedded within a tendon) typically located in the **lateral head of the gastrocnemius muscle**. It is a common anatomical variation found in approximately 10% to 30% of the population. It articulates with the posterior surface of the lateral femoral condyle and is often bilateral. **Why the other options are incorrect:** * **Medial head of gastrocnemius:** While sesamoid bones can rarely occur here, the fabella is classically and most frequently associated with the lateral head. * **Adductor magnus & Adductor longus:** These are muscles of the medial compartment of the thigh. They do not typically contain sesamoid bones near the knee joint. The adductor magnus inserts into the adductor tubercle, but no "fabella" is associated with its tendon. **High-Yield Clinical Pearls for NEET-PG:** * **Radiological Significance:** On a lateral X-ray of the knee, the fabella can be mistaken for a **loose body** (joint mouse) or an avulsion fracture. Its smooth, rounded borders and specific location help distinguish it. * **Fabella Syndrome:** This is a clinical condition where the fabella causes posterolateral knee pain due to compression of the common peroneal nerve or friction against the femoral condyle. * **Evolutionary Note:** It is more common in Asian populations compared to Caucasians and is considered a "vestigial" structure that is actually increasing in prevalence globally over the last century. * **Other Sesamoids to Remember:** The **Patella** (largest sesamoid in the body, in the quadriceps tendon) and the **Pisiform** (in the flexor carpi ulnaris tendon).

Q: Which muscle is primarily responsible for the dorsiflexion of the ankle joint?

Tibialis anterior. ### Explanation **1. Why Tibialis Anterior is Correct:** The **Tibialis anterior** is the most medial and superficial muscle of the anterior compartment of the leg. It originates from the lateral condyle and upper two-thirds of the tibial shaft and inserts into the medial cuneiform and the base of the first metatarsal. Its primary action is **dorsiflexion** of the ankle joint and **inversion** of the foot. It is supplied by the **deep peroneal nerve (L4, L5)**. **2. Why the Other Options are Incorrect:** * **Peroneus longus:** Located in the lateral compartment of the leg, its primary functions are **eversion** of the foot and weak plantarflexion. It is supplied by the superficial peroneal nerve. * **Tibialis posterior:** Located in the deep posterior compartment, it is the principal **invertor** of the foot and also assists in plantarflexion. It is supplied by the tibial nerve. * **Soleus:** Along with the gastrocnemius, it forms the triceps surae in the posterior compartment. It is a powerful **plantarflexor** of the ankle, essential for walking and standing. **3. NEET-PG High-Yield Clinical Pearls:** * **Foot Drop:** Injury to the **Common Peroneal Nerve** (e.g., neck of fibula fracture) leads to paralysis of the Tibialis anterior, resulting in "foot drop" and a high-stepping gait. * **Shin Splints:** Tibialis anterior strain is a common cause of "anterior tibial stress syndrome" in runners. * **Antagonist:** The primary antagonist to the Tibialis anterior (dorsiflexion) is the Gastrocnemius-Soleus complex (plantarflexion). * **Inversion Duo:** Remember that both Tibialis anterior (anterior compartment) and Tibialis posterior (posterior compartment) act together to **invert** the foot.

Q: A secondary ossification center appears before birth at which anatomical location?

Lower end of femur. ### Explanation In human anatomy, most secondary ossification centers appear after birth. However, the **lower end of the femur** is a notable exception and a high-yield fact for medical exams [1]. **Why the lower end of the femur is correct:** The secondary ossification center for the distal femur appears during the **9th month of intrauterine life** (approximately 36-40 weeks of gestation). Because it is consistently present at birth in full-term infants, its presence is used in forensic medicine and pediatrics as a **medicolegal indicator of fetal maturity**. **Analysis of incorrect options:** * **Upper end of femur:** The center for the head of the femur typically appears between **4 to 6 months after birth**. * **Lower end of tibia:** This center appears approximately **6 months after birth**. * **Lower end of fibula:** This center appears around **1 year after birth**. **Clinical Pearls & High-Yield Facts for NEET-PG:** 1. **Rule of Exceptions:** There are only three secondary ossification centers usually present at birth: * **Lower end of femur** (36-40 weeks) * **Upper end of tibia** (40 weeks/at birth) * **Cuboid bone** (just before or at birth) 2. **The "Growing End":** In the lower limb, the growing ends of long bones are the **lower end of the femur** and the **upper end of the tibia** (mnemonic: *"To the knee I flee, from the elbow I go"*). 3. **Forensic Significance:** If a newborn's body is found, an X-ray or dissection showing the distal femoral epiphysis confirms the fetus reached full-term maturity [1].

Q: Which nerve supplies the gluteus medius muscle?

Superior gluteal nerve. The **Superior Gluteal Nerve (L4, L5, S1)** is a branch of the sacral plexus that exits the pelvis through the greater sciatic foramen, passing **above** the piriformis muscle. It provides motor innervation to three key muscles: the **gluteus medius**, the **gluteus minimus**, and the **tensor fasciae latae (TFL)**. ### Analysis of Options: * **A. Superior gluteal nerve (Correct):** It supplies the gluteus medius and minimus, which are the primary abductors and medial rotators of the hip. * **B. Inferior gluteal nerve (L5, S1, S2):** This nerve exits **below** the piriformis and exclusively supplies the **gluteus maximus**, the chief extensor of the hip. * **C. Nerve to obturator internus (L5, S1, S2):** Supplies the obturator internus and the superior gemellus muscles. * **D. Nerve to quadratus femoris (L4, L5, S1):** Supplies the quadratus femoris and the inferior gemellus muscles. ### High-Yield Clinical Pearls for NEET-PG: 1. **Trendelenburg Sign:** Paralysis or weakness of the gluteus medius (due to superior gluteal nerve injury, often from misplaced intramuscular injections) leads to a "dipping" of the pelvis toward the unsupported side when the patient stands on the affected leg. 2. **Trendelenburg Gait:** To compensate for the pelvic drop, the patient tilts their trunk toward the affected side (the side of the nerve lesion) while walking; this is known as a **Lurching gait**. 3. **Safe Zone for Injections:** Intramuscular injections in the gluteal region should be given in the **upper outer quadrant** to avoid injuring the sciatic nerve and the gluteal nerves.

Question 1

Which of the following is true about the medial meniscus?

Accepted Answer

C-shaped

Answer

Made up of hyaline cartilage

Answer

Injury of the lateral meniscus is more frequent than the medial meniscus

Answer

Inner part is more avascular

Question 2

Which of the following is NOT true about the femoral nerve?

Accepted Answer

Its root value is L2-L5.

Answer

It lies outside the femoral sheath.

Answer

The saphenous nerve is its largest cutaneous branch.

Answer

It supplies the femoral artery.

Question 3

A 42-year-old mother of three children visits the outpatient clinic complaining that her youngest son cannot walk yet. Radiographic and physical examinations reveal an unstable hip joint. Which of the following ligaments is responsible for stabilization of the hip joint in childhood?

Accepted Answer

Ligament of the head of the femur

Answer

Iliofemoral

Answer

Pubofemoral

Answer

Ischiofemoral

Question 4

A 'saphenous vein cutdown' is a procedure used to locate the great saphenous vein at the ankle. To find this vein, the skin would be incised where?

Accepted Answer

Anterior to the medial malleolus

Answer

Anterior to the lateral epicondyle

Answer

Posterior to the medial epicondyle

Answer

Posterior to the lateral malleolus

Question 5

Which artery supplies the gluteus medius muscle?

Accepted Answer

Superior gluteal artery

Answer

Obturator artery

Answer

Ilio-inguinal artery

Answer

Inferior gluteal artery

Question 6

The stability of the ankle joint is maintained by all of the following, except?

Accepted Answer

Plantar calcaneonavicular (spring) ligament

Answer

Deltoid ligament

Answer

Lateral ligament

Answer

Shape of the superior talar articular surface

Question 7

Where is the fabella typically present?

Accepted Answer

Lateral head of gastrocnemius

Answer

Medial head of gastrocnemius

Answer

Adductor magnus

Answer

Adductor longus

Question 8

Which muscle is primarily responsible for the dorsiflexion of the ankle joint?

Accepted Answer

Tibialis anterior

Answer

Peroneus longus

Answer

Tibialis posterior

Answer

Soleus

Question 9

A secondary ossification center appears before birth at which anatomical location?

Accepted Answer

Lower end of femur

Answer

Upper end of femur

Answer

Lower end of tibia

Answer

Lower end of fibula

Question 10

Which nerve supplies the gluteus medius muscle?

Accepted Answer

Superior gluteal nerve

Answer

Inferior gluteal nerve

Answer

Nerve to obturator internus

Answer

Nerve to quadratus femoris

Lower Limb — MCQs

Lower Limb — MCQs

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