Lower Limb — MCQs

A 27-year-old male athlete experiences deep calf pain that almost causes him to drop out of a competition. Doppler ultrasound and surgical exposure reveal an accessory portion of the medial head of the gastrocnemius constricting the popliteal artery. The superior medial border of the popliteal fossa is located above the medial head of the gastrocnemius. Which of the following structures forms this border?

Q439Easy

By which nerve is the hip joint supplied?

Q440Easy

At its origin, the profunda femoris artery lies on which side of the femoral artery?

Lower Limb Indian Medical PG Practice Questions and MCQs

Question 431: What is the line joining the anterior superior iliac spine to the ischial tuberosity and passing through the greater trochanter called?

A. Nelaton's line (Correct Answer)
B. Shoemaker's line
C. Chiene's line
D. Perkins line

Explanation: ### Explanation **Nelaton’s Line** is a clinical landmark used to assess the relationship between the pelvis and the femur. It is an imaginary line drawn from the **Anterior Superior Iliac Spine (ASIS)** to the **Ischial Tuberosity**. In a normal hip, the tip of the **greater trochanter** lies on or just below this line. If the greater trochanter is palpated above this line, it indicates a superior displacement of the femur, commonly seen in conditions like **posterior dislocation of the hip** or **fractures of the neck of the femur**. #### Analysis of Incorrect Options: * **Shoemaker’s Line:** This line connects the tip of the greater trochanter to the ASIS and is extended upward toward the umbilicus. In a normal hip, the line passes at or above the umbilicus; if it passes below, it suggests trochanteric displacement. * **Chiene’s Line:** These are two parallel lines joining the tops of the greater trochanters and the two ASIS. Non-parallelism indicates upward displacement of one trochanter. * **Perkins Line:** A vertical line drawn perpendicular to Hilgenreiner’s line (horizontal) through the lateral edge of the acetabular roof. It is used in pediatric X-rays to diagnose **Developmental Dysplasia of the Hip (DDH)**; the femoral head should normally lie medial to this line. #### High-Yield Clinical Pearls for NEET-PG: * **Bryant’s Triangle:** Another method to assess trochanteric height. A shortening of the horizontal base of this triangle indicates upward displacement of the trochanter. * **Trendelenburg Test:** Assesses the stability of the hip and the strength of the abductors (Gluteus medius and minimus). * **Shenton’s Line:** A smooth curve formed by the inferior margin of the pubic ramus and the medial margin of the femoral neck on an X-ray; its disruption is a classic sign of hip fracture or dislocation.

Question 432: Which of the following is NOT seen in injury to the common peroneal nerve?

A. Loss of sensation over the sole (Correct Answer)
B. Foot drop
C. Injury to the neck of the fibula is a common cause
D. Loss of dorsiflexion of the toes

Explanation: The **Common Peroneal Nerve (CPN)**, also known as the common fibular nerve, is the most frequently injured nerve in the lower limb due to its superficial course around the **neck of the fibula**. ### **Why Option A is the Correct Answer** Loss of sensation over the **sole of the foot** is a feature of **Tibial Nerve** injury, not CPN injury. The tibial nerve gives off the medial and lateral plantar nerves, which provide sensory innervation to the sole. In contrast, the CPN (via its superficial branch) provides sensation to the lateral side of the leg and the dorsum of the foot. ### **Analysis of Other Options** * **Option B (Foot Drop):** The CPN divides into the Deep Peroneal Nerve (DPN) and Superficial Peroneal Nerve (SPN). The DPN supplies the anterior compartment muscles (dorsiflexors). Paralysis of these muscles leads to the inability to lift the foot, resulting in **foot drop**. * **Option C (Neck of Fibula):** This is the most common site of injury because the nerve winds tightly around the fibular neck, making it vulnerable to fractures, tight casts, or compression. * **Option D (Loss of dorsiflexion of toes):** The DPN supplies the *Extensor Hallucis Longus* and *Extensor Digitorum Longus*. Injury to the CPN results in the loss of extension (dorsiflexion) of the toes. ### **High-Yield Clinical Pearls for NEET-PG** * **Gait:** Patients with CPN injury exhibit a **"High Steppage Gait"** to prevent the toes from dragging. * **Sensory Loss:** The pathognomonic sensory loss for Deep Peroneal Nerve injury is the **first web space** (between the 1st and 2nd toes). * **Mnemonic (PED):** **P**eroneal **E**verts and **D**orsiflexes; if injured, the foot is **D**ropped and **I**nverted (due to unopposed Tibialis Posterior).

Question 433: The oblique popliteal ligament is pierced by which artery?

A. Anterior branch of the popliteal artery
B. Medial inferior genicular branch of the popliteal artery
C. Medial superior genicular branch of the popliteal artery
D. Middle genicular branch of the popliteal artery (Correct Answer)

Explanation: Explanation: The **oblique popliteal ligament** is an expansion of the tendon of the semimembranosus muscle. It strengthens the posterior part of the knee joint capsule. The **Middle Genicular Artery (MGA)** is a small branch arising from the anterior aspect of the popliteal artery. It is the specific vessel that **pierces the oblique popliteal ligament** to enter the knee joint. Once inside, it supplies the cruciate ligaments (ACL and PCL) and the synovial membrane. This is a classic anatomical landmark frequently tested in postgraduate exams. **Analysis of Incorrect Options:** * **Option A (Anterior branch):** The popliteal artery divides into anterior and posterior tibial arteries at the lower border of the popliteus muscle; it does not have a specific "anterior branch" that pierces this ligament. * **Option B & C (Medial inferior/superior genicular branches):** These arteries wind around the medial side of the femur and tibia, respectively. They participate in the genicular anastomosis around the knee but do not pierce the posterior ligamentous structures. **High-Yield Clinical Pearls for NEET-PG:** * **The "Middle" Rule:** The middle genicular artery supplies the **middle** structures of the knee (cruciate ligaments). * **Nerve Supply:** Along with the MGA, the **genicular branch of the posterior division of the obturator nerve** also pierces the oblique popliteal ligament to provide sensory innervation to the joint. * **Origin:** The oblique popliteal ligament arises from the **semimembranosus** tendon, while the arcuate popliteal ligament is associated with the head of the fibula.

Question 434: The patellar plexus is formed by which nerve?

A. Lateral cutaneous nerve
B. Intermediate cutaneous nerve
C. Medial cutaneous nerve
D. All of the above (Correct Answer)

Explanation: The **patellar plexus** is a fine network of nerves situated in the subcutaneous tissue in front of the patella, ligamentum patellae, and the upper end of the tibia. It serves as the primary sensory supply to the skin overlying the anterior aspect of the knee. ### **Explanation of the Correct Answer** The correct answer is **D (All of the above)** because the patellar plexus is formed by the terminal communication of four specific nerves: 1. **Lateral Cutaneous Nerve of Thigh:** Specifically its anterior branch. 2. **Intermediate Cutaneous Nerve of Thigh:** A branch of the femoral nerve. 3. **Medial Cutaneous Nerve of Thigh:** Specifically its anterior division (also a branch of the femoral nerve). 4. **Infrapatellar branch of the Saphenous Nerve:** This is a crucial contributor from the medial side. Since options A, B, and C are all primary contributors to this plexus, "All of the above" is the most accurate choice. ### **Analysis of Options** * **Option A, B, and C:** While each of these nerves contributes to the plexus, selecting any one individually would be incomplete. The plexus is a collective anastomosis of these three nerves along with the infrapatellar branch of the saphenous nerve. ### **High-Yield Clinical Pearls for NEET-PG** * **Nerve Supply:** Remember that the patellar plexus is purely **sensory**. * **Surgical Significance:** During total knee arthroplasty (TKA) or midline incisions of the knee, the **infrapatellar branch of the saphenous nerve** is the most commonly injured nerve, leading to numbness or paresthesia on the anterolateral aspect of the leg. * **Root Values:** The femoral nerve (L2, L3, L4) provides the intermediate and medial cutaneous nerves, while the lateral cutaneous nerve of the thigh arises directly from the lumbar plexus (L2, L3).

Question 435: All of the following are true about the lateral cutaneous nerve of the thigh EXCEPT:

A. Supplies skin over the lateral aspect of the thigh
B. Supplies skin over the medial aspect of the thigh (Correct Answer)
C. Arises from L2 and L3 spinal nerves
D. It is a purely sensory nerve

Explanation: The **Lateral Cutaneous Nerve of the Thigh (LCNT)** is a branch of the lumbar plexus that provides sensory innervation to the lower limb. ### **Explanation of Options** * **Correct Answer (B):** This statement is false. The LCNT supplies the skin over the **lateral** aspect of the thigh down to the knee. The medial aspect of the thigh is supplied by the **obturator nerve** and the **medial cutaneous nerve of the thigh** (a branch of the femoral nerve). * **Option A:** This is true. Its primary function is to provide sensation to the lateral thigh. * **Option C:** This is true. It arises from the **posterior divisions of the ventral rami of L2 and L3** spinal nerves. * **Option D:** This is true. The LCNT is a **purely sensory nerve**; it does not supply any muscles. ### **Clinical Pearls for NEET-PG** * **Meralgia Paraesthetica:** This is a high-yield clinical condition caused by the compression of the LCNT as it passes under or through the **inguinal ligament** (medial to the anterior superior iliac spine). It presents as tingling, numbness, or burning pain on the outer thigh. * **Risk Factors:** Obesity, tight clothing (belts), pregnancy, and diabetes are common triggers for compression. * **Anatomical Course:** It emerges from the lateral border of the psoas major muscle, crosses the iliacus, and enters the thigh deep to the inguinal ligament. * **Differential Diagnosis:** Unlike femoral nerve palsy, Meralgia Paraesthetica involves **no motor weakness** and no loss of the knee-jerk reflex, because the LCNT is purely sensory.

Question 436: Which of the following are part of the Hamstrings?

A. Semimembranosus, Gracilis
B. Semitendinosus, Semimembranosus (Correct Answer)
C. Semitendinosus, Gracilis
D. Semimembranosus, Short head of biceps femoris

Explanation: To be classified as a **true hamstring muscle**, a muscle must fulfill four specific criteria: it must originate from the **ischial tuberosity**, insert into one of the bones of the leg (tibia or fibula), be innervated by the **tibial part of the sciatic nerve**, and act as a flexor of the knee and extensor of the hip. ### **Analysis of Options** * **Correct Answer (B):** Both **Semitendinosus** and **Semimembranosus** satisfy all four criteria. Along with the **Long head of Biceps Femoris**, they form the true hamstring group. * **Option A & C (Gracilis):** While the Gracilis inserts into the *Pes Anserinus* (alongside the semitendinosus), it is an adductor of the thigh, originates from the pubis, and is supplied by the **obturator nerve**. * **Option D (Short head of Biceps Femoris):** This is the most common "trap" in NEET-PG. The short head originates from the **linea aspera** (not the ischial tuberosity) and is supplied by the **common peroneal** (fibular) part of the sciatic nerve. It is considered a "modified" hamstring. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Adductor Magnus (Ischial part):** Also known as the "Hamstring part" of the adductor magnus. It originates from the ischial tuberosity and is supplied by the tibial nerve, but it does not cross the knee joint. 2. **Pes Anserinus ("Say Grace before Tea"):** The common insertion on the medial condyle of the tibia for **S**artorius, **G**racilis, and **S**emitendinosus. 3. **Action:** Hamstrings are the primary flexors of the knee. During walking, they act as dynamic stabilizers to prevent hyperextension. 4. **Nerve Supply:** The sciatic nerve (L4–S3) supplies all hamstrings. A lesion to the tibial component spares only the short head of the biceps femoris.

Question 437: Which structure primarily supports the medial longitudinal arch of the foot?

A. Plantar fascia (Correct Answer)
B. Sustentaculum tali
C. Peroneus longus
D. Peroneus brevis

Explanation: The medial longitudinal arch is the highest and most important arch of the foot. Its integrity is maintained by a combination of bony shapes, ligaments, and muscles. **Why Plantar Fascia is correct:** The **plantar fascia (plantar aponeurosis)** is the most important **passive stabilizer** of the foot. It acts like a "tie-beam" connecting the two ends of the arch (calcaneus and metatarsal heads). During the toe-off phase of walking, the **Windlass Mechanism** occurs: extension of the toes tightens the plantar fascia, shortening the distance between the heel and forefoot, thereby elevating and supporting the medial longitudinal arch. **Analysis of Incorrect Options:** * **B. Sustentaculum tali:** This is a bony projection of the calcaneus that supports the talus. While it serves as a pulley for the Flexor Hallucis Longus, it is a bony feature, not the primary supportive structure. * **C. Peroneus longus:** This muscle helps maintain the **lateral** and **transverse** arches. While it crosses to the medial side to insert on the first metatarsal, its primary role is not the main support of the medial arch. * **D. Peroneus brevis:** This muscle inserts into the base of the 5th metatarsal and primarily acts as an evertor; it does not support the medial arch. **High-Yield Clinical Pearls for NEET-PG:** * **Spring Ligament (Plantar Calcaneonavicular):** This is the most important **ligamentous** support (the "mainstay") of the medial arch. If "Plantar Fascia" is not an option, Spring Ligament is often the answer. * **Tibialis Posterior:** Known as the "dynamic stabilizer" or the most important **muscular** support of the medial arch. Its failure leads to acquired flat foot (Pes Planus). * **Keystone of the arch:** The **Head of the Talus** is the keystone of the medial longitudinal arch.

Question 438: A 27-year-old male athlete experiences deep calf pain that almost causes him to drop out of a competition. Doppler ultrasound and surgical exposure reveal an accessory portion of the medial head of the gastrocnemius constricting the popliteal artery. The superior medial border of the popliteal fossa is located above the medial head of the gastrocnemius. Which of the following structures forms this border?

A. Tendon of biceps femoris
B. Tendons of semitendinosus and semimembranosus (Correct Answer)
C. Tendon of plantaris
D. Tendinous hiatus of adductor magnus

Explanation: **Explanation:** The question describes a classic case of **Popliteal Artery Entrapment Syndrome (PAES)**, where an anatomical variation (usually an anomalous medial head of the gastrocnemius) compresses the popliteal artery. To answer this, one must identify the anatomical boundaries of the **popliteal fossa**, a diamond-shaped space behind the knee. **1. Why the Correct Answer is Right:** The popliteal fossa is bounded superiorly by the divergent hamstring muscles and inferiorly by the convergent heads of the gastrocnemius. * **Superior-Medial Border:** Formed by the **semitendinosus and semimembranosus** muscles. * **Superior-Lateral Border:** Formed by the **biceps femoris**. * **Inferior-Medial Border:** Formed by the medial head of the gastrocnemius. * **Inferior-Lateral Border:** Formed by the lateral head of the gastrocnemius and the plantaris. **2. Analysis of Incorrect Options:** * **Option A (Biceps femoris):** This forms the **superior-lateral** border of the fossa. * **Option C (Plantaris):** This muscle contributes to the **inferior-lateral** border, lying deep to the lateral head of the gastrocnemius. * **Option D (Adductor hiatus):** This is the opening in the adductor magnus through which the femoral artery enters the popliteal fossa to become the popliteal artery. It is the *inlet* to the fossa, not a superficial boundary. **Clinical Pearls for NEET-PG:** * **Popliteal Artery Entrapment Syndrome (PAES):** Most commonly due to the medial head of the gastrocnemius arising more laterally than normal. It presents as intermittent claudication in young athletes. * **Contents of Popliteal Fossa (Medial to Lateral):** Popliteal artery (deepest), Popliteal vein, and Tibial nerve (most superficial). * **Floor of the Fossa:** Formed by the popliteal surface of the femur, the capsule of the knee joint (oblique popliteal ligament), and the popliteus fascia.

Question 439: By which nerve is the hip joint supplied?

A. Deep peroneal
B. Femoral (Correct Answer)
C. Sciatic
D. Posterior cutaneous nerve of thigh

Explanation: **Explanation:** The nerve supply to the hip joint follows **Hilton’s Law**, which states that the nerve supplying the muscles extending across a joint also supplies the joint itself. The hip joint receives a rich sensory innervation from several nerves derived from the lumbar and sacral plexuses. **Why Femoral Nerve is Correct:** The **Femoral nerve (L2-L4)** provides sensory branches to the anterior aspect of the hip joint (specifically via the nerve to the rectus femoris). Other major contributors to the hip joint include the **Obturator nerve** (medial/inferior aspect) and the **Superior gluteal nerve** (superior aspect). In the context of the given options, the Femoral nerve is the primary and correct choice. **Analysis of Incorrect Options:** * **Deep Peroneal Nerve:** This is a branch of the common peroneal nerve that supplies the anterior compartment of the leg and the dorsum of the foot. It does not reach the hip. * **Sciatic Nerve:** While the nerve to the quadratus femoris (a branch of the sacral plexus often associated with the sciatic nerve complex) supplies the posterior hip joint, the main trunk of the Sciatic nerve itself is generally not cited as the primary articular supply in standard textbooks. * **Posterior Cutaneous Nerve of Thigh:** This is a purely sensory nerve supplying the skin of the posterior thigh and popliteal fossa; it does not provide articular branches to the hip joint. **High-Yield Clinical Pearls for NEET-PG:** * **Referred Pain:** Due to the shared innervation by the **Femoral and Obturator nerves**, pathology in the hip joint (like Perthes disease or OA) often presents as **referred pain to the knee**. * **Hilton's Law Application:** Always remember that the nerves supplying the muscles moving the joint (Flexors: Femoral; Adductors: Obturator; Abductors: Superior Gluteal) all contribute to the joint's nerve supply.

Question 440: At its origin, the profunda femoris artery lies on which side of the femoral artery?

A. Medial
B. Lateral (Correct Answer)
C. Posterior
D. Posteromedial

Explanation: The **profunda femoris artery** (deep artery of the thigh) is the largest branch of the femoral artery and serves as the primary blood supply to the muscles of all three thigh compartments. ### **Explanation of the Correct Answer** The profunda femoris artery arises from the **lateral aspect** of the femoral artery, approximately 3.5–4 cm below the inguinal ligament within the femoral triangle. * **Initial Course:** At its origin, it lies **lateral** to the femoral artery. * **Subsequent Course:** As it descends, it passes **posterior** to the femoral artery and femoral vein to reach the medial side of the femur, eventually ending as the fourth perforating artery. ### **Analysis of Incorrect Options** * **A. Medial:** The femoral vein lies medial to the femoral artery at the level of the inguinal ligament. The profunda femoris does not originate medially. * **C. Posterior:** While the artery eventually runs posterior to the femoral vessels, its point of **origin** is specifically on the lateral side. * **D. Posteromedial:** This describes the position of the artery later in its course as it passes deep to the adductor longus, but not its origin. ### **High-Yield Clinical Pearls for NEET-PG** * **Surface Anatomy:** The origin of the profunda femoris is located roughly midway between the midinguinal point and the apex of the femoral triangle. * **Crucial Branches:** It gives off the **Medial and Lateral Circumflex Femoral arteries**. Note that the Medial Circumflex Femoral artery is the chief supply to the head of the femur (clinically vital in femoral neck fractures). * **Surgical Importance:** During femoral artery cannulation or surgeries, the lateral origin of the profunda femoris is a key landmark to avoid accidental injury or misidentification.

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Lower Limb — MCQs

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