Lower Limb Practice Questions

Q: What is true about the cuboid bone?

It articulates with the calcaneus.. **Explanation:** The **cuboid bone** is one of the seven tarsal bones located on the lateral aspect of the foot. It plays a crucial role in maintaining the lateral longitudinal arch. **1. Why Option D is Correct:** The cuboid articulates proximally with the **calcaneus** at the calcaneocuboid joint. This joint is a part of the midtarsal (transverse tarsal) joint complex. Distally, it articulates with the 4th and 5th metatarsals, and medially with the lateral cuneiform and occasionally the navicular. **2. Why the Other Options are Incorrect:** * **Option A:** Like all tarsal bones, the cuboid develops via **endochondral ossification** (ossification within a cartilage model), not membranous ossification. * **Option B:** The **lunate** is a carpal bone found in the wrist, not the foot. The cuboid articulates proximally with the calcaneus. * **Option C:** The flexor retinaculum of the foot (laciniate ligament) attaches to the medial malleolus and the calcaneus. It is the **peroneal retinaculum** and the **long plantar ligament** that have attachments related to the cuboid. **3. High-Yield Clinical Pearls for NEET-PG:** * **Ossification:** The cuboid is often the only tarsal bone (besides the calcaneus and talus) to have an ossification center present at **birth**. This is a key radiological marker for assessing fetal maturity. * **Peroneal Groove:** The plantar surface of the cuboid contains a deep groove for the tendon of the **peroneus longus** muscle. * **Nutcracker Fracture:** A compression fracture of the cuboid between the calcaneus and the metatarsals is colloquially known as a "Nutcracker fracture."

Q: Which nerve supplies the adductor compartment of the thigh?

Obturator nerve. The **obturator nerve** is the primary motor nerve of the **medial (adductor) compartment** of the thigh. Arising from the ventral rami of **L2, L3, and L4** (lumbar plexus), it enters the thigh through the obturator canal. It supplies all muscles in this compartment, including the adductor longus, adductor brevis, gracilis, and obturator externus. **Analysis of Options:** * **Femoral Nerve (L2-L4):** This is the nerve of the **anterior (extensor) compartment** of the thigh. It supplies the quadriceps femoris, sartorius, and pectineus. * **Superior Gluteal Nerve (L4-S1):** This nerve supplies the gluteus medius, gluteus minimus, and tensor fasciae latae. Its primary function is hip abduction and stabilization. * **Inferior Gluteal Nerve (L5-S2):** This nerve exclusively supplies the **gluteus maximus**, the chief extensor of the hip. **High-Yield Clinical Pearls for NEET-PG:** * **The "Hybrid" Muscle:** The **Adductor Magnus** has a dual nerve supply. Its adductor part is supplied by the **obturator nerve**, while its "hamstring" part is supplied by the **tibial component of the sciatic nerve**. * **Pectineus:** Often considered a transitional muscle, it is located in the medial compartment but is typically supplied by the **femoral nerve** (though it may occasionally receive a branch from the obturator). * **Howship-Romberg Sign:** Pain or numbness on the medial aspect of the thigh due to compression of the obturator nerve (often by an obturator hernia). * **Referred Pain:** Because the obturator nerve also provides sensory innervation to the hip and knee joints, pathology in the hip (like Perthes disease) often presents as referred pain to the medial knee.

Q: Which of the following is NOT true regarding the course of the great saphenous vein?

It begins at the saphenous opening.. Explanation: 1. Why Option A is the correct answer (The False Statement): The Great Saphenous Vein (GSV) does not begin at the saphenous opening; rather, it ends there. It originates at the medial end of the dorsal venous arch of the foot. It then ascends anterior to the medial malleolus, passes along the medial side of the leg and thigh, and finally pierces the cribriform fascia at the saphenous opening (hiatus saphenus) to drain into the femoral vein [1]. 2. Analysis of Incorrect Options (True Statements): * Option B: At the knee, the GSV passes along the posteromedial aspect (roughly a hand's breadth behind the medial border of the patella). This is a high-yield anatomical landmark for surgical procedures. * Option C: In the leg, the GSV is closely accompanied by the saphenous nerve (a branch of the femoral nerve) [2]. Injury to this nerve during vein stripping leads to numbness along the medial aspect of the leg and foot [2]. * Option D: The posterior arch vein (Leonardo’s vein) is a significant tributary in the leg that joins the GSV just below the knee. It is clinically important as it communicates with the deep veins via "Cockett’s perforators." Clinical Pearls for NEET-PG: * Venesection Site: The GSV is most consistently found anterior to the medial malleolus, making it a preferred site for emergency venous access. * Valves: It contains approximately 10–20 valves, with the most functional one located at the saphenofemoral junction. * Coronary Artery Bypass Graft (CABG): The GSV is the most commonly used vessel for arterial grafting due to its length and accessibility [3].

Q: What is the largest synovial joint in the body?

Knee joint. The **Knee Joint** is the correct answer as it is anatomically the **largest and most complex synovial joint** in the human body. It is classified as a modified hinge joint (bicondylar joint) that involves three articulations: two femorotibial and one femoropatellar. Its size is necessitated by the massive articular surfaces of the femoral and tibial condyles required to support the body's weight while providing a wide range of motion. **Analysis of Options:** * **Shoulder Joint (Option A):** While it is the most mobile joint in the body (ball-and-socket), its articular surfaces are relatively small, with a shallow glenoid cavity that covers only a fraction of the humeral head. * **Hip Joint (Option B):** This is a very large and stable ball-and-socket joint, often confused with the knee. However, in terms of total surface area and the volume of the synovial cavity, it is smaller than the knee. * **Ankle Joint (Option C):** This is a hinge joint formed by the tibia, fibula, and talus. It is significantly smaller in surface area compared to the three joints mentioned above. **High-Yield Clinical Pearls for NEET-PG:** * **Stability:** The knee joint is inherently unstable due to the fit of the bones; it relies heavily on ligaments (**ACL, PCL, MCL, LCL**) and the **menisci** for structural integrity. * **Locking Mechanism:** The knee undergoes "locking" during full extension via **medial rotation of the femur on the tibia** (weight-bearing). The **Popliteus** muscle is known as the "Key to the knee" because it unlocks the joint by laterally rotating the femur. * **Synovial Extension:** The suprapatellar bursa is a direct extension of the knee's synovial cavity, making it a common site for joint effusions.

Q: Which of the following tendons is commonly used for transplantation in the body?

Plantaris tendon. The **Plantaris tendon** is the correct answer because it is considered a "vestigial" structure in humans, often referred to as the **"Freshman’s Nerve"** (due to its thin, cord-like appearance being mistaken for a nerve by first-year students). **Why Plantaris?** 1. **Redundancy:** It is a weak flexor of the knee and ankle; its absence does not result in any functional deficit. 2. **Length and Strength:** It provides a long, high-tensile strength tendon suitable for grafting. 3. **Anatomical Availability:** It is absent in approximately 7–10% of the population, but when present, it is the premier choice for reconstructive surgeries, such as repairing tendons in the hand [1]. **Analysis of Incorrect Options:** * **Extensor Hallucis Longus (EHL):** Essential for the extension of the great toe and dorsiflexion of the foot. Removing it would cause significant functional loss (e.g., "drop toe"). * **Extensor Digitorum Longus (EDL):** Crucial for extending the lateral four toes and dorsiflexing the ankle. It is not used as a primary graft source due to the resulting gait impairment. * **Flexor Hallucis Longus (FHL):** While the FHL is sometimes used in specific local transfers (e.g., to reinforce a chronic Achilles tendon rupture), it is not the "standard" or most common tendon for general transplantation because it is vital for the "push-off" phase of walking. **High-Yield Clinical Pearls for NEET-PG:** * **Palmaris Longus:** In the upper limb, the Palmaris Longus is the equivalent "vestigial" tendon used for grafting. * **Freshman’s Nerve:** Always remember this synonym for the Plantaris tendon to avoid confusion with the Sural nerve. * **Clinical Use:** Apart from hand surgery, the Plantaris is a common graft source for **flexor tendon injuries** and **reconstructive ophthalmic surgery** [1].

Q: A patient sustained a hyperextension injury to the knee. Which of the following ligaments prevents excessive anterior gliding of the femur on the tibia?

Posterior cruciate ligament. ### Explanation The **Posterior Cruciate Ligament (PCL)** is the strongest ligament of the knee. Its primary biomechanical function is to prevent **posterior displacement of the tibia relative to the femur**. Conversely, this can be described as preventing **anterior gliding of the femur on the tibia**, especially when the knee is weight-bearing and flexed. During hyperextension injuries, the PCL is the primary structure that resists the posterior displacement of the tibia, making it the correct answer. #### Analysis of Options: * **Posterior Cruciate Ligament (PCL):** It originates from the lateral surface of the medial condyle of the femur and attaches to the posterior intercondylar area of the tibia. It prevents the femur from sliding forward off the tibial plateau during weight-bearing. * **Anterior Cruciate Ligament (ACL):** This ligament prevents **anterior displacement of the tibia on the femur** (or posterior gliding of the femur on the tibia). It is most commonly injured during non-contact pivoting or sudden deceleration. * **Medial Collateral Ligament (MCL):** Its primary role is to resist **valgus (abduction) stress** at the knee. * **Lateral Collateral Ligament (LCL):** Its primary role is to resist **varus (adduction) stress** at the knee. #### High-Yield Clinical Pearls for NEET-PG: * **PCL Injury Sign:** The **"Sag Sign"** or **Posterior Drawer Test** is used to diagnose PCL deficiency. * **ACL vs. PCL:** Remember the mnemonic **"PAM"** (PCL attaches to Medial condyle) and **"APL"** (ACL attaches to Lateral condyle) for their femoral attachments. * **Unhappy Triad (O'Donoghue):** Involves injury to the ACL, MCL, and Medial Meniscus (though modern studies suggest the Lateral Meniscus is more commonly injured in acute phases). * **Blood Supply:** The cruciate ligaments are supplied by the **middle genicular artery**, a branch of the popliteal artery.

Q: What is the chief extensor of the knee joint during hip flexion?

Rectus femoris. **Explanation:** The **Rectus femoris** is the correct answer because it is the only component of the quadriceps femoris muscle group that is **bi-articular** (crosses two joints). It originates from the Anterior Inferior Iliac Spine (AIIS) and the groove above the acetabulum, allowing it to act on both the hip and the knee. **Why Rectus Femoris is correct:** While all four heads of the quadriceps extend the knee, the Rectus femoris is uniquely positioned to extend the knee while the hip is flexed (e.g., during the preparatory phase of kicking a ball). According to Starling’s law of muscle contraction, a muscle is most effective when stretched. When the hip is extended, the Rectus femoris is stretched, but when the hip is flexed, it becomes the primary driver of knee extension to maintain power, as the vasti muscles are purely mono-articular. **Why other options are incorrect:** * **Vastus medialis & Vastus lateralis:** These are mono-articular muscles originating from the femur. They only act on the knee joint and their action is independent of the position of the hip joint. * **Hamstrings:** These are primarily flexors of the knee and extensors of the hip. They are antagonists to the action described in the question. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** All quadriceps muscles are supplied by the **Femoral Nerve (L2-L4)**. * **Kicking Muscle:** Rectus femoris is often referred to as the "kicking muscle." * **Vastus Medialis Obliquus (VMO):** This specific part of the vastus medialis is crucial for the patellar alignment and prevents lateral dislocation of the patella. * **Clinical Sign:** Avulsion of the AIIS typically involves the origin of the Rectus femoris, common in young athletes.

Q: A sesamoid bone is present in the tendon of which of the following muscles?

Flexor hallucis brevis. ### Explanation **Correct Answer: D. Flexor hallucis brevis** **Concept:** Sesamoid bones are small, rounded bones embedded within tendons, typically found where tendons cross joints. Their primary function is to reduce friction and act as pulleys to increase the mechanical advantage of the muscle. In the foot, the most prominent sesamoid bones are located within the **two heads of the Flexor Hallucis Brevis (FHB)** tendon, specifically at the plantar aspect of the first metatarsophalangeal (MTP) joint. * The **medial (tibial) sesamoid** is located in the medial head of the FHB. * The **lateral (fibular) sesamoid** is located in the lateral head of the FHB. These bones bear weight and protect the tendon of the Flexor Hallucis Longus (FHL), which runs in the groove between them. **Analysis of Incorrect Options:** * **A. Flexor hallucis longus:** While this tendon passes *between* the sesamoids of the FHB, it does not contain a sesamoid bone itself at the MTP joint. * **B. Extensor hallucis brevis:** This muscle inserts into the dorsal aspect of the proximal phalanx; sesamoids are typically found on the plantar (weight-bearing) surface to resist compression. * **C. Adductor hallucis:** Although the lateral sesamoid receives some fibers from the adductor hallucis and abductor hallucis, the bones are anatomically defined as being embedded within the FHB tendon. **High-Yield Facts for NEET-PG:** * **Largest Sesamoid:** The Patella (embedded in the Quadriceps tendon). * **Fabella:** A common sesamoid bone found in the lateral head of the **Gastrocnemius**. * **Os Vesalianum:** A sesamoid occasionally found in the **Peroneus brevis** tendon at the base of the 5th metatarsal. * **Clinical Correlation:** **Sesamoiditis** is a common cause of pain under the great toe in athletes. Fractures of these sesamoids (especially the medial one) must be differentiated from a **bipartite sesamoid** (a normal anatomical variant).

Question 1

What is true about the cuboid bone?

Accepted Answer

It articulates with the calcaneus.

Answer

It develops by membranous ossification.

Answer

It articulates proximally with the lunate bone.

Answer

The flexor retinaculum is attached to it.

Question 2

The popliteal artery is difficult to palpate because:

Accepted Answer

It is not superficial and does not pass over a prominent bony structure.

Answer

It is not superficial.

Answer

It does not pass over a prominent bony structure.

Answer

It is superficial but does not pass over a prominent bony structure.

Question 3

Which nerve supplies the adductor compartment of the thigh?

Accepted Answer

Obturator nerve

Answer

Femoral nerve

Answer

Superior gluteal nerve

Answer

Inferior gluteal nerve

Question 4

Which of the following is NOT true regarding the course of the great saphenous vein?

Accepted Answer

It begins at the saphenous opening.

Answer

It runs along the posteromedial aspect of the knee joint.

Answer

It is associated with the saphenous nerve in the lower part of the leg.

Answer

The posterior arch vein is one of its tributaries.

Question 5

What is the largest synovial joint in the body?

Accepted Answer

Knee joint

Answer

Shoulder joint

Answer

Hip joint

Answer

Ankle joint

Question 6

Which of the following tendons is commonly used for transplantation in the body?

Accepted Answer

Plantaris tendon

Answer

Extensor hallucis longus (EHL)

Answer

Extensor digitorum longus (EDL)

Answer

Flexor hallucis longus (FHL)

Question 7

A patient sustained a hyperextension injury to the knee. Which of the following ligaments prevents excessive anterior gliding of the femur on the tibia?

Accepted Answer

Posterior cruciate ligament

Answer

Anterior cruciate ligament

Answer

Medial collateral ligament

Answer

Lateral collateral ligament

Question 8

A 20-year-old male suffered trauma to his right leg while playing football and did not seek medical attention initially. The affected area became painful, red, and tender. A few days later, he noticed he had to drag the affected foot, and examination revealed a loss of eversion. An X-ray of the affected leg was performed. Which of the following muscles is most likely affected?

Accepted Answer

Muscle A

Answer

Muscle B

Answer

Muscle C

Answer

Muscle D

Question 9

What is the chief extensor of the knee joint during hip flexion?

Accepted Answer

Rectus femoris

Answer

Vastus medialis

Answer

Vastus lateralis

Answer

Hamstrings

Question 10

A sesamoid bone is present in the tendon of which of the following muscles?

Accepted Answer

Flexor hallucis brevis

Answer

Flexor hallucis longus

Answer

Extensor hallucis brevis

Answer

Adductor hallucis

Lower Limb — MCQs

Lower Limb — MCQs

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