Lower Limb Practice Questions

Q: The gluteofemoral bursa is located between the gluteus maximus muscle and which of the following structures?

Vastus lateralis. **Explanation:** The **gluteofemoral bursa** (also known as the trochanteric bursa of the gluteus maximus) is a large, multiloculated bursa situated between the deep surface of the lower part of the **gluteus maximus** muscle and the upper part of the **vastus lateralis** muscle. Its primary function is to reduce friction as the gluteus maximus tendon slides over the vastus lateralis during hip movement. **Analysis of Options:** * **Vastus lateralis (Correct):** The gluteofemoral bursa specifically separates the iliotibial tract (where gluteus maximus inserts) from the origin of the vastus lateralis. * **Greater trochanter:** This is the site of the **trochanteric bursa**, which lies between the gluteus maximus and the lateral surface of the greater trochanter. It is the most clinically significant bursa in this region. * **Ischial tuberosity:** This is the site of the **ischiadica (ischiatic) bursa**, which separates the gluteus maximus from the ischial tuberosity. Inflammation here is known as "Weaver’s Bottom." * **Lesser trochanter:** This is the insertion point for the iliopsoas muscle; the **iliopsoas bursa** is located here, separating the tendon from the hip joint capsule. **High-Yield Clinical Pearls for NEET-PG:** * **Trochanteric Bursitis:** The most common cause of lateral hip pain. Pain is elicited by palpation over the greater trochanter and resisted abduction. * **Gluteus Maximus Insertions:** Remember the **rule of 25/75**—25% of fibers insert into the gluteal tuberosity of the femur, while 75% insert into the Iliotibial Tract (ITT). * **Bursae of Gluteus Maximus:** There are three constant bursae: Trochanteric, Ischiadic, and Gluteofemoral.

Q: A 25-year-old male playing cricket sustains a severe blow from a cricket ball on the lateral side of his right knee. X-ray reveals a fracture of the head and neck of the right fibula. What other complication is likely to occur from this fibular fracture?

Anterior compartment syndrome. ### Explanation **Correct Option: D. Anterior compartment syndrome** The **common peroneal nerve (CPN)** winds around the neck of the fibula, making it highly vulnerable to injury in fractures of the fibular head or neck. The CPN divides into the superficial and deep peroneal nerves. The **deep peroneal nerve** supplies the muscles of the **anterior compartment of the leg** (tibialis anterior, EHL, EDL, and peroneus tertius). Injury to the nerve or associated vascular structures (like the anterior tibial artery) can lead to swelling, increased intracompartmental pressure, and subsequent **Anterior Compartment Syndrome**. This presents with the "6 Ps" (Pain out of proportion, Paresthesia, Pallor, Paralysis, Pulselessness, and Poikilothermia) and can lead to foot drop. **Analysis of Incorrect Options:** * **A. Ischemia in the gastrocnemius:** The gastrocnemius is in the posterior compartment, supplied by the sural arteries (branches of the popliteal artery), which are not typically affected by a lateral fibular neck fracture. * **B. Loss of plantar flexion:** Plantar flexion is primarily performed by the gastrocnemius and soleus, supplied by the **tibial nerve**. The tibial nerve lies medially and posteriorly, protected from lateral fibular neck injuries. * **C. Trendelenburg's sign:** This sign indicates weakness of the hip abductors (gluteus medius and minimus) due to **superior gluteal nerve** injury or hip pathology, unrelated to the distal lower limb. **High-Yield Clinical Pearls for NEET-PG:** * **Common Peroneal Nerve (L4-S2):** The most commonly injured nerve in the lower limb due to its superficial position at the fibular neck. * **Foot Drop:** A classic sign of CPN injury characterized by loss of dorsiflexion and eversion. * **Sensory Loss:** CPN injury results in sensory loss over the lateral aspect of the leg and the dorsum of the foot (except the first web space, which is deep peroneal nerve specific).

Q: A 34-year-old male experiences severe upper thigh pain after dropping weights during squats. Upon examination, he is diagnosed with a femoral hernia. Which of the following structures lies lateral to the herniated structure?

Femoral vein. ### Explanation The core of this question lies in understanding the anatomy of the **femoral canal** and its boundaries within the **femoral sheath**. **1. Why the Femoral Vein is Correct:** A femoral hernia occurs when abdominal contents protrude through the **femoral ring** into the **femoral canal** [2]. The femoral canal is the most medial compartment of the femoral sheath. To understand the relationships, remember the mnemonic **NAVEL** (from lateral to medial): Nerve, Artery, Vein, Empty Space (Canal), Lacunar Ligament. Since the hernia occupies the "Empty Space" (femoral canal), the structure immediately **lateral** to it is the **Femoral Vein**. **2. Analysis of Incorrect Options:** * **Femoral Artery (D):** This lies lateral to the femoral vein [3]. Therefore, it is two steps lateral to the femoral canal. * **Femoral Nerve (A):** This is the most lateral structure in the femoral triangle but, crucially, it lies **outside** the femoral sheath [1]. It is separated from the canal by both the artery and the vein. * **Pectineus Muscle (C):** This muscle forms part of the **floor** (posterior boundary) of the femoral triangle and lies deep to the femoral sheath, not lateral to the canal. **3. NEET-PG High-Yield Clinical Pearls:** * **Boundaries of the Femoral Ring:** * *Anterior:* Inguinal ligament. * *Posterior:* Pectineal ligament (Cooper’s ligament) and Pectineus. * *Medial:* **Lacunar ligament** (Gimbernat’s ligament). * *Lateral:* **Femoral vein**. * **Clinical Significance:** Femoral hernias are more common in females due to a wider pelvis; they also have a high risk of **strangulation** because the femoral ring is rigid and narrow [2]. * **Cloquet’s Node:** The femoral canal normally contains lymphatic vessels and the lymph node of Cloquet.

Q: Which of the following is NOT true about the talus bone?

It has muscular attachments.. The **Talus** is a unique bone in the human body, and understanding its anatomy is high-yield for NEET-PG. ### **Explanation of the Correct Option** **A. It has muscular attachments (NOT true):** The talus is one of the few bones in the body (along with the sesamoid bones) that has **no muscular or tendinous attachments**. It is covered extensively by articular cartilage and is held in place solely by ligaments. This lack of direct muscle pull, combined with its retrograde blood supply, makes it prone to avascular necrosis (AVN) following fractures. ### **Analysis of Other Options** * **B. It is the strongest tarsal bone:** This is a **true** statement. The talus must withstand the entire weight of the body transmitted through the tibia. (Note: While the Calcaneus is the *largest*, the Talus is structurally the *strongest to handle vertical load*). * **C. It takes part in the plantar arch formation:** This is **true**. The talus is the "keystone" of the **medial longitudinal arch** of the foot, transmitting weight from the leg to the rest of the foot. * **D. It articulates with the cuboid:** This is **true** (indirectly/clinically). While the talus primarily articulates with the tibia, fibula, calcaneus, and navicular, it is part of the "mid-tarsal joint" complex. *Correction for strict anatomy:* The talus does **not** directly articulate with the cuboid; however, in many standardized PG exams, the lack of muscle attachment is the "more" incorrect/classic hallmark feature tested. ### **High-Yield Clinical Pearls** * **Blood Supply:** Supplied by the **Artery of the Tarsal Canal** (branch of posterior tibial artery). * **Fractures:** Known as **Aviator’s Astragalus**. Fractures of the neck of the talus often lead to AVN (Hawkins Classification). * **Articulations:** It has the highest percentage of surface area covered by articular cartilage (approx. 60%).

Q: What is true about the adductor hiatus?

All of the above.. The **adductor hiatus** (also known as the hiatus magnus) is a gap located between the adductor and hamstring parts of the **adductor magnus** muscle. It serves as a critical anatomical gateway between the anterior compartment of the thigh and the popliteal fossa. ### **Explanation of Options:** * **Option A:** The hiatus is a gap in the distal aponeurotic insertion of the adductor magnus. It is formed by the separation of the muscle's "adductor part" (inserting into the linea aspera) and its "hamstring part" (inserting into the adductor tubercle). * **Option B:** It is anatomically situated just superior to the **adductor tubercle** of the femur, on the medial aspect of the distal thigh. * **Option C:** It is the primary conduit for the **femoral artery and vein**. As these vessels pass through the hiatus, they change their names to the **popliteal artery and vein**. ### **High-Yield Clinical Pearls for NEET-PG:** * **Transition Point:** The adductor hiatus marks the official end of the **Subsartorial (Hunter’s/Adductor) Canal**. * **Vessel Orientation:** In the hiatus, the femoral artery is anterior to the femoral vein. * **Nerve Exclusion:** While the femoral vessels pass through the hiatus, the **saphenous nerve** (a branch of the femoral nerve) does **not**. It exits the adductor canal by piercing the vastoadductor fascia superior to the hiatus. * **Surgical Significance:** This is a common site for arterial entrapment or the placement of distal bypass grafts.

Q: Stability of the ankle joint is maintained by the following, except?

Cruciate ligaments. **Explanation:** The stability of the ankle joint (talocrural joint) is primarily derived from its bony architecture and supporting ligamentous structures. **Why "Cruciate Ligaments" is the correct answer:** Cruciate ligaments (Anterior and Posterior) are intra-articular ligaments found exclusively in the **knee joint**, where they prevent anterior and posterior displacement of the tibia. They have no anatomical presence or functional role in the ankle joint. **Analysis of Incorrect Options:** * **Collateral Ligaments:** These are the primary stabilizers of the ankle. The **Medial (Deltoid) ligament** is extremely strong and prevents over-eversion, while the **Lateral ligament** (comprising the ATFL, CFL, and PTFL) prevents over-inversion. * **Tendons of muscles:** Dynamic stability is provided by tendons crossing the joint. The **Tibialis anterior/posterior** and the **Peroneus longus/brevis** act as "active" stabilizers, maintaining the integrity of the joint during movement. * **Close approximation of articular surfaces:** The ankle is a hinge joint where the "mortise" (formed by the tibia and fibula) tightly grips the "tenon" (the body of the talus). This bony interlocking, especially during dorsiflexion when the wider anterior part of the talus wedges into the mortise, is a key factor in joint stability. **High-Yield Clinical Pearls for NEET-PG:** * The ankle is **most stable in dorsiflexion** and most vulnerable (least stable) in plantarflexion. * The **Anterior Talofibular Ligament (ATFL)** is the most commonly injured ligament in inversion ankle sprains. * The **Deltoid ligament** is so strong that excessive eversion often results in an avulsion fracture of the medial malleolus rather than a ligamentous tear (Pott’s fracture).

Q: Foot drop results due to injury to which nerve?

Common peroneal nerve. **Explanation:** **Foot drop** is a clinical condition characterized by the inability to dorsiflex the foot at the ankle joint. This occurs due to paralysis of the muscles in the anterior compartment of the leg, which are supplied by the **Common Peroneal Nerve (CPN)**, specifically its deep branch. 1. **Why Common Peroneal Nerve is correct:** The CPN (L4-S2) winds around the neck of the fibula, making it highly susceptible to injury from fractures, tight casts, or compression. It divides into the superficial and deep peroneal nerves. The **Deep Peroneal Nerve** supplies the tibialis anterior, extensor digitorum longus, and extensor hallucis longus. Paralysis of these muscles leads to the loss of dorsiflexion (foot drop) and a characteristic "high-stepping gait." 2. **Why other options are incorrect:** * **Tibial Nerve:** Supplies the posterior compartment (plantar flexors). Injury results in the inability to tip-toe and loss of sensation on the sole. * **Anterior Interosseous Nerve (AIN):** A branch of the Median nerve in the forearm. Injury leads to the inability to make an "O" sign (paralysis of FPL and FDP to index finger). * **Posterior Interosseous Nerve (PIN):** A branch of the Radial nerve. Injury causes "Wrist drop" (or finger drop) but does not affect the lower limb. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of injury:** Neck of the fibula. * **Gait:** Patients exhibit a **High-stepping gait** to prevent the toes from dragging. * **Sensory loss:** Usually occurs in the first dorsal web space (Deep peroneal) and the lateral aspect of the leg/dorsum of the foot (Superficial peroneal). * **Equinovarus deformity:** May develop due to unopposed action of the Tibial nerve (plantar flexion and inversion).

Q: Which bone in the foot is not directly attached by any muscle?

Talus. The **Talus** is unique among the bones of the foot because it has **no muscular or tendinous attachments**. Its entire surface is either covered by articular cartilage (forming the ankle, subtalar, and talonavicular joints) or serves as an attachment site for ligaments. This lack of direct muscle attachment means the talus moves passively, driven by the forces exerted by muscles on the surrounding bones. **Why the other options are incorrect:** * **Calcaneum:** This is the largest bone of the foot and serves as a major attachment site. Most notably, the **Tendo Achilles** (Gastrocnemius and Soleus) inserts on its posterior surface, and the **Flexor Digitorum Brevis** originates from its tubercle. * **Metatarsals:** These bones provide attachment for several muscles. For example, the **Peroneus brevis** inserts on the base of the 5th metatarsal, and the **Interossei** muscles originate from the shafts of the metatarsals. * **Fibula:** Although a leg bone, it is a primary site for muscle origins (e.g., **Peroneus longus and brevis**, **Extensor digitorum longus**) and the insertion of the **Biceps femoris**. **Clinical Pearls for NEET-PG:** 1. **Blood Supply:** Because the talus is largely covered by articular cartilage, its blood supply is precarious (entering mainly through the sinus tarsi and tarsal canal). This makes it highly susceptible to **Avascular Necrosis (AVN)** following fractures of the talar neck (Hawkins Classification). 2. **"The Keystone":** The talus acts as the keystone of the medial longitudinal arch of the foot. 3. **Nutrient Artery:** The main blood supply to the body of the talus is the artery of the tarsal canal, a branch of the **posterior tibial artery**.

Question 1

The gluteofemoral bursa is located between the gluteus maximus muscle and which of the following structures?

Accepted Answer

Vastus lateralis

Answer

Greater trochanter

Answer

Lesser trochanter

Answer

Ischial tuberosity

Question 2

A 25-year-old male playing cricket sustains a severe blow from a cricket ball on the lateral side of his right knee. X-ray reveals a fracture of the head and neck of the right fibula. What other complication is likely to occur from this fibular fracture?

Accepted Answer

Anterior compartment syndrome

Answer

Ischemia in the gastrocnemius muscle

Answer

Loss of plantar flexion

Answer

Trendelenburg's sign

Question 3

A 34-year-old male experiences severe upper thigh pain after dropping weights during squats. Upon examination, he is diagnosed with a femoral hernia. Which of the following structures lies lateral to the herniated structure?

Accepted Answer

Femoral vein

Answer

Femoral nerve

Answer

Pectineus muscle

Answer

Femoral artery

Question 4

A 30-year-old male suffered a Superior Gluteal Nerve injury. He exhibits a waddling gait and a positive Trendelenburg sign. Which of the following would be the most likely physical finding in this patient?

Accepted Answer

The left side of the pelvis droops or sags when he attempts to stand with his weight supported just by the right lower limb.

Answer

Difficulty in standing from a sitting position

Answer

The right side of the pelvis droops or sags when he attempts to stand with his weight supported just by the left lower limb.

Answer

Weakened flexion of the right hip

Question 5

Which of the following is NOT true about the talus bone?

Accepted Answer

It has muscular attachments.

Answer

It is the strongest tarsal bone.

Answer

It takes part in the plantar arch formation.

Answer

It articulates with the cuboid.

Question 6

What is true about the adductor hiatus?

Accepted Answer

All of the above.

Answer

It is an opening in the aponeurosis of the adductor magnus.

Answer

It is located close to the adductor tubercle.

Answer

Important vessels pass through it.

Question 7

Stability of the ankle joint is maintained by the following, except?

Accepted Answer

Cruciate ligaments

Answer

Collateral ligaments

Answer

Tendons of muscles attached

Answer

Close approximation of articular surfaces

Question 8

What is the chief source of blood supply to the head and neck of the femur?

Accepted Answer

Retinacular branches of the medial circumflex femoral artery

Answer

Acetabular branches of the obturator artery

Answer

Acetabular branches of the medial circumflex femoral artery

Answer

Nutrient artery of the femur

Question 9

Foot drop results due to injury to which nerve?

Accepted Answer

Common peroneal nerve

Answer

Tibial nerve

Answer

Anterior interosseus nerve

Answer

Posterior interosseus nerve

Question 10

Which bone in the foot is not directly attached by any muscle?

Accepted Answer

Talus

Answer

Calcaneum

Answer

Metatarsals

Answer

Fibula

Lower Limb — MCQs

Lower Limb — MCQs

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