Lower Limb Practice Questions

Q: What is the largest and most important branch of the posterior tibial artery?

Peroneal artery. **Explanation:** The **posterior tibial artery** is the larger terminal branch of the popliteal artery. It descends in the posterior compartment of the leg, deep to the gastrocnemius and soleus muscles. **Why the Peroneal (Fibular) Artery is correct:** The **peroneal artery** is the largest and most significant branch of the posterior tibial artery. It arises approximately 2.5 cm distal to the lower border of the popliteus muscle. It runs obliquely toward the fibula and descends along its medial side, supplying the lateral compartment of the leg and the calcaneal region. Its clinical importance lies in its role in providing collateral circulation to the foot if the tibial arteries are occluded. **Analysis of Incorrect Options:** * **Circumflex fibular artery:** This is a small branch that usually arises from the beginning of the posterior tibial artery (or sometimes the anterior tibial artery) and winds around the neck of the fibula. * **Medial and Lateral plantar arteries:** These are the **terminal branches** of the posterior tibial artery, formed deep to the flexor retinaculum (at the level of the porta pedis). While important for foot vascularity, they are divisions of the parent artery rather than its "largest branch" along its course in the leg. **High-Yield Clinical Pearls for NEET-PG:** * **Nutrient Artery to Tibia:** The posterior tibial artery gives off the nutrient artery to the tibia, which is the largest nutrient artery in the body. * **Palpation:** The posterior tibial pulse is best felt halfway between the **medial malleolus** and the **medial tubercle of the calcaneus**. * **Pirogoff’s Artery:** Another name for the peroneal artery in older texts. * **Grafting:** The peroneal artery is often spared in atherosclerotic disease, making it a vital source for distal bypass or free flap surgery (e.g., fibular osteocutaneous flap).

Q: Which of the following ligaments is not attached to the talus?

Spring ligament. The **Spring ligament** (Plantar calcaneonavicular ligament) is the correct answer because it does not have a direct attachment to the talus. Instead, it spans the gap between the **sustentaculum tali** of the calcaneus and the **navicular bone**. Its primary function is to support the head of the talus from below, acting as a "hammock" to maintain the medial longitudinal arch of the foot. ### Evaluation of Options: * **Talonavicular ligament (Option A):** As the name implies, it connects the neck of the talus to the dorsal surface of the navicular bone. * **Deltoid ligament (Option C):** This strong, medial collateral ligament of the ankle has four parts. Two of these—the **anterior tibiotalar** and **posterior tibiotalar** fibers—attach directly to the talus. * **Cervical ligament (Option D):** This is a strong extracapsular ligament located in the sinus tarsi that connects the neck of the talus to the neck of the calcaneus. It is crucial for subtalar joint stability. ### NEET-PG High-Yield Pearls: * **The "Hammock" Concept:** The Spring ligament is the main supporter of the **medial longitudinal arch**. If it fails or overstretches, the head of the talus descends, leading to **Pes Planus (Flat Foot)**. * **The Talus Paradox:** The talus is unique because it has **no muscular or tendinous attachments**; it relies entirely on ligamentous support and bony articulation. * **Blood Supply:** The talus has a retrograde blood supply (mainly via the artery of the tarsal canal). Fractures of the neck often lead to **Avascular Necrosis (AVN)**.

Q: Ligation of which nerve will lead to paresthesia and pain on the dorsum of the foot during venesection of the great saphenous vein?

Saphenous nerve. **Explanation:** The **Saphenous nerve** is the correct answer because of its intimate anatomical relationship with the **Great Saphenous Vein (GSV)**. 1. **Anatomical Basis:** The saphenous nerve is the longest cutaneous branch of the femoral nerve ($L3, L4$). It descends through the adductor canal and becomes superficial at the medial side of the knee. Crucially, as it descends into the leg, it runs immediately **anterior** to the medial malleolus, closely accompanying the GSV [1]. 2. **Clinical Correlation:** Venesection (cut-down) of the GSV is typically performed just anterior to the medial malleolus. During this procedure, the saphenous nerve is at high risk of being accidentally ligated or injured [1]. Since it provides sensory innervation to the **medial side of the leg and the medial border of the dorsum of the foot**, injury results in paresthesia and pain in these regions [1]. **Analysis of Incorrect Options:** * **Sural Nerve:** Accompanies the **Small Saphenous Vein** behind the lateral malleolus. Injury affects the lateral border of the foot. * **Genicular Nerve:** These are branches (from femoral, obturator, and sciatic nerves) that supply the knee joint capsule and ligaments, not the distal dorsum of the foot. * **Deep Peroneal Nerve:** Supplies the web space between the first and second toes. It is located deep in the anterior compartment and is not involved in superficial venesection. **High-Yield Clinical Pearls for NEET-PG:** * **GSV Location:** Starts at the medial end of the dorsal venous arch, passes **anterior** to the medial malleolus. * **Nerve-Vein Pairs:** * Great Saphenous Vein + Saphenous Nerve [1]. * Small Saphenous Vein + Sural Nerve. * **Saphenous Nerve Block:** Often used for procedures on the medial leg/foot; it is a purely sensory nerve (no motor deficit if injured).

Q: A patient presents with sensory loss on adjacent sides of the great and second toes and impaired dorsiflexion of the foot. These signs probably indicate damage to which of the following nerves?

Deep peroneal. The clinical presentation points toward a lesion of the **Deep Peroneal Nerve (Deep Fibular Nerve)**, a branch of the Common Peroneal nerve. This nerve is responsible for both specific motor and sensory functions in the lower limb: 1. **Motor Function:** It innervates the muscles of the anterior compartment of the leg (Tibialis anterior, Extensor digitorum longus, Extensor hallucis longus, and Peroneus tertius). Damage leads to the loss of **dorsiflexion**, resulting in **foot drop**. 2. **Sensory Function:** Its cutaneous distribution is highly specific—it supplies only the **first interdigital cleft** (adjacent sides of the great and second toes). **Analysis of Incorrect Options:** * **Superficial Peroneal Nerve:** Supplies the lateral compartment (eversion) and provides sensation to the majority of the dorsum of the foot, *excluding* the first web space. * **Tibial Nerve:** Supplies the posterior compartment (plantarflexion). Injury causes loss of plantarflexion and sensory loss on the sole of the foot. * **Sural Nerve:** A purely sensory nerve supplying the lateral aspect of the foot and the little toe. It has no motor component, so it would not cause impaired dorsiflexion. **NEET-PG High-Yield Pearls:** * **Site of Injury:** The Common Peroneal nerve is most commonly injured at the **neck of the fibula**. * **Anterior Compartment Syndrome:** The Deep Peroneal nerve is the nerve most commonly compressed in this surgical emergency. * **Gait:** Foot drop caused by Deep Peroneal nerve injury results in a **"High Steppage Gait"** to prevent the toes from dragging.

Q: Which bursa communicates with the knee joint?

Suprapatellar bursa. ### Explanation The knee joint is the largest and most complex joint in the body, characterized by an extensive synovial membrane. The correct answer is the **Suprapatellar bursa**. **1. Why Suprapatellar Bursa is Correct:** The suprapatellar bursa (or suprapatellar pouch) is located superior to the patella, between the femur and the tendon of the quadriceps femoris. During fetal development, it starts as a separate bursa but eventually fuses with the synovial cavity of the knee joint. Therefore, in adults, it represents a **direct extension of the joint cavity**. This communication is clinically significant because joint effusions (fluid collection) will typically accumulate here first. **2. Analysis of Incorrect Options:** * **Prepatellar bursa:** Located subcutaneously between the skin and the anterior surface of the patella. It does **not** communicate with the joint. Inflammation here is known as "Housemaid’s knee." * **Infrapatellar bursa:** There are two (superficial and deep). The **Deep infrapatellar bursa** is located between the tibia and the ligamentum patellae, separated from the joint by the infrapatellar fat pad. Neither communicates with the joint cavity. * **Lateral patellar bursa:** This is not a standard anatomical term for the major bursae around the knee; however, bursae related to the lateral collateral ligament do not communicate with the main synovial cavity. **3. NEET-PG High-Yield Clinical Pearls:** * **Popliteus Bursa:** This is another important bursa that **always communicates** with the knee joint. * **Semimembranosus Bursa:** Often communicates with the joint; its enlargement is a common cause of a **Baker’s Cyst** (Popliteal cyst). * **Articularis Genu:** This small muscle (derived from vastus intermedius) inserts into the suprapatellar bursa to pull it superiorly during extension, preventing the synovial membrane from being trapped in the joint.

Q: Identify the muscle that is not in relation with the structure marked A.

Gluteus maximus. ***Gluteus maximus*** - The **gluteus maximus** does not insert into the **greater trochanter** but instead inserts into the **gluteal tuberosity** of the femur and the **iliotibial tract**. - It is the largest gluteal muscle responsible for **hip extension** and **external rotation**, but has no direct relation to the greater trochanter. *Gluteus medius* - The **gluteus medius** inserts directly into the **lateral surface of the greater trochanter**, making it closely related to structure A. - This muscle is crucial for **hip abduction** and **pelvic stabilization** during walking, with its insertion site being the greater trochanter. *Gluteus minimus* - The **gluteus minimus** inserts into the **anterior aspect of the greater trochanter**, establishing a direct anatomical relationship with structure A. - It works synergistically with gluteus medius for **hip abduction** and **medial rotation** of the thigh. *Piriformis* - The **piriformis muscle** inserts into the **superior border of the greater trochanter**, making it anatomically related to structure A. - This deep muscle is important for **hip external rotation** and **hip stabilization**, with its insertion directly on the greater trochanter.

Question 1

What is the largest and most important branch of the posterior tibial artery?

Accepted Answer

Peroneal artery

Answer

Circumflex fibular artery

Answer

Medial plantar artery

Answer

Lateral plantar artery

Question 2

Which of the following ligaments is not attached to the talus?

Accepted Answer

Spring ligament

Answer

Talonavicular ligament

Answer

Deltoid ligament

Answer

Cervical ligament

Question 3

Ligation of which nerve will lead to paresthesia and pain on the dorsum of the foot during venesection of the great saphenous vein?

Accepted Answer

Saphenous nerve

Answer

Sural nerve

Answer

Genicular nerve

Answer

Deep peroneal nerve

Question 4

A patient presents with sensory loss on adjacent sides of the great and second toes and impaired dorsiflexion of the foot. These signs probably indicate damage to which of the following nerves?

Accepted Answer

Deep peroneal

Answer

Superficial peroneal

Answer

Tibial nerve

Answer

Sural

Question 5

Which of the following forms the tendinous sling in the superficial arch of the foot?

Accepted Answer

Peroneus longus and tibialis posterior

Answer

Peroneus longus and peroneus brevis

Answer

Peroneus longus and flexor hallucis longus

Answer

Peronius brevis and tibialis posterior

Question 6

Tibialis posterior has insertion to all of the following bones except?

Accepted Answer

1st metatarsal

Answer

2nd metatarsal

Answer

Medial Cuneiform

Answer

3rd Metatarsal

Question 7

What is the true relationship of the sac in a femoral hernia with the pubic tubercle?

Accepted Answer

Below and lateral

Answer

Above and lateral

Answer

Above and medial

Answer

Below and medial

Question 8

Which bursa communicates with the knee joint?

Accepted Answer

Suprapatellar bursa

Answer

Infrapatellar bursa

Answer

Prepatellar bursa

Answer

Lateral patellar bursa

Question 9

Identify the muscle that is not in relation with the structure marked A.

Accepted Answer

Gluteus maximus

Answer

Gluteus medius

Answer

Gluteus minimus

Answer

Piriformis

Question 10

During the surgical repair of a femoral hernia, which structure is most vulnerable to major injury?

Accepted Answer

Laterally

Answer

Anteriorly

Answer

Posteriorly

Answer

Medially

Lower Limb — MCQs

Lower Limb — MCQs

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