Lower Limb Practice Questions

Q: If the anterior cruciate ligament is torn, how does the tibia move relative to the femur?

Anteriorly. **Explanation:** The **Anterior Cruciate Ligament (ACL)** is one of the primary stabilizers of the knee joint. Its fundamental anatomical function is to prevent **excessive anterior translation** of the tibia relative to the femur and to resist internal rotation. 1. **Why "Anteriorly" is correct:** The ACL originates from the anterior intercondylar area of the tibia and attaches to the medial aspect of the lateral femoral condyle. When this ligament is torn, the primary physical restraint against forward movement is lost. Consequently, the tibia slides **anteriorly** (forward) under the femur, a movement clinically demonstrated by the **Anterior Drawer Test** or the **Lachman Test**. 2. **Why other options are incorrect:** * **Posteriorly:** This movement is prevented by the **Posterior Cruciate Ligament (PCL)**. A posterior shift of the tibia indicates a PCL injury (Posterior Drawer sign). * **Medially/Laterally:** Medial and lateral stability (preventing varus/valgus stress) is primarily maintained by the **Medial Collateral Ligament (MCL)** and **Lateral Collateral Ligament (LCL)**, not the ACL. **High-Yield Clinical Pearls for NEET-PG:** * **Lachman Test:** The most sensitive clinical test for an acute ACL tear (performed at 20-30° flexion). * **Unhappy Triad (O'Donoghue’s):** Simultaneous injury to the **ACL, MCL, and Medial Meniscus** (though recent studies suggest the Lateral Meniscus is more commonly injured in acute ACL tears). * **Segond Fracture:** An avulsion fracture of the lateral tibial condyle; it is pathognomonic for an ACL tear. * **Blood Supply:** The ACL is supplied by the **middle genicular artery**.

Q: Which of the following ligaments does NOT resist hyperextension of the hip?

Sacroiliac ligament. **Explanation:** The hip joint is a stable ball-and-socket joint reinforced by three strong extracapsular ligaments: the **iliofemoral, pubofemoral, and ischiofemoral ligaments**. These ligaments are arranged in a "spiral" fashion such that they become **taut during extension** and relax during flexion. **Why the Sacroiliac Ligament is the correct answer:** The **Sacroiliac (SI) ligament** is not a ligament of the hip joint. It connects the sacrum to the ilium, functioning to stabilize the sacroiliac joint and transmit weight from the axial skeleton to the lower limbs. It has no role in the range of motion or stability of the femoroacetabular (hip) joint itself. **Analysis of Incorrect Options:** * **Iliofemoral Ligament (Y-ligament of Bigelow):** The strongest ligament in the body. It prevents hyperextension and helps maintain an erect posture without constant muscular activity. * **Pubofemoral Ligament:** Located anteroinferiorly, it limits hyperextension and excessive abduction. * **Ischiofemoral Ligament:** Located posteriorly, it is the weakest of the three but tightens during extension and internal rotation, resisting hyperextension. **NEET-PG High-Yield Pearls:** * **Iliofemoral Ligament:** Often tested as the "strongest ligament in the body." It is shaped like an inverted 'Y'. * **Screw-home mechanism of the hip:** Extension "screws" the femoral head into the acetabulum by tightening these three ligaments, providing maximum stability. * **Ligamentum Teres:** An intracapsular ligament that carries the **acetabular branch of the obturator artery** (crucial for supplying the head of the femur in children).

Q: A patient undergoing saphenous cannulation develops sudden onset of pain along the medial border of the ipsilateral foot. Which nerve is most likely to have been accidentally ligated?

Saphenous nerve. ### Explanation **Correct Answer: C. Saphenous nerve** The **saphenous nerve** is the longest cutaneous branch of the femoral nerve ($L2-L4$). It descends through the adductor canal and becomes superficial at the medial side of the knee. Crucially, at the ankle, it runs **immediately anterior to the medial malleolus**, closely accompanying the **great saphenous vein**. During a saphenous cutdown (cannulation), which is typically performed 1 cm anterior and superior to the medial malleolus, the nerve is at high risk of being accidentally ligated or injured. Since the saphenous nerve provides sensory innervation to the **medial border of the foot** (up to the head of the first metatarsal), injury results in localized pain, numbness, or paresthesia in that specific distribution. **Analysis of Incorrect Options:** * **A. Sural nerve:** Accompanies the *small* saphenous vein behind the *lateral* malleolus. It supplies the lateral border of the foot. * **B. Deep peroneal nerve:** Supplies the skin of the first interdigital cleft (web space between the 1st and 2nd toes). * **D. Genicular nerve:** These are branches (from femoral, obturator, and sciatic nerves) that supply the knee joint capsule, not the medial border of the foot. **High-Yield NEET-PG Pearls:** * **Saphenous Cutdown Site:** 1 cm anterior and superior to the medial malleolus. * **Nerve-Vein Pairs:** * Great Saphenous Vein + Saphenous Nerve (Anterior to medial malleolus). * Small Saphenous Vein + Sural Nerve (Posterior to lateral malleolus). * **Clinical Sign:** Injury to the saphenous nerve during surgery often presents as "Saphenous Neuritis" or chronic pain along the medial leg and foot.

Q: Which ligaments provide antero-posterior stability to the knee joint?

Cruciate ligaments. **Explanation:** The knee joint is a modified hinge joint that relies heavily on its ligamentous structures for stability. The **Cruciate Ligaments** (Anterior and Posterior) are the primary stabilizers against **antero-posterior (AP) displacement** of the tibia relative to the femur. * **Anterior Cruciate Ligament (ACL):** Prevents anterior translation of the tibia on the femur. It is the weaker of the two and is frequently injured during sudden deceleration or pivoting. * **Posterior Cruciate Ligament (PCL):** Prevents posterior translation of the tibia on the femur. It is the strongest ligament of the knee and acts as the main stabilizer in the weight-bearing flexed knee. **Analysis of Incorrect Options:** * **Medial and Lateral Collateral Ligaments (MCL/LCL):** These are extracapsular ligaments that provide **medio-lateral (valgus/varus) stability**. They prevent the knee from buckling sideways. * **Patellar Ligament:** This is the distal continuation of the quadriceps tendon. Its primary role is to facilitate the **extensor mechanism** of the knee rather than providing AP stability. **Clinical Pearls for NEET-PG:** 1. **Drawer Tests:** The Anterior Drawer Test (ACL) and Posterior Drawer Test (PCL) are the classic clinical maneuvers used to assess AP stability. 2. **Lachman Test:** This is the most sensitive clinical test for an ACL tear. 3. **Unhappy Triad (O'Donoghue):** A common sports injury involving the ACL, Medial Meniscus, and MCL. 4. **Blood Supply:** The cruciate ligaments are supplied by the **middle genicular artery** (a branch of the popliteal artery).

Q: What is the strongest flexor of the hip joint?

Iliopsoas. The **Iliopsoas** is the correct answer as it is the most powerful and primary flexor of the hip joint. It is a composite muscle formed by the union of the **Psoas major** (originating from the T12-L5 vertebrae) and the **Iliacus** (originating from the iliac fossa). Both muscles insert into the **lesser trochanter** of the femur. Its strategic position and large physiological cross-sectional area allow it to initiate hip flexion and maintain posture while standing. **Analysis of Incorrect Options:** * **Sartorius (A):** Known as the "Tailor’s muscle," it is a weak flexor of the hip. Its primary actions are a combination of flexion, abduction, and lateral rotation of the hip, along with flexion of the knee. * **Gluteus Maximus (B):** This is the **strongest extensor** of the hip joint, not a flexor. It is crucial for activities like climbing stairs or rising from a sitting position. * **Pectineus (D):** While it contributes to hip flexion and adduction, it is significantly weaker than the iliopsoas. It is often considered a hybrid muscle (dual nerve supply: femoral and obturator nerves). **High-Yield Clinical Pearls for NEET-PG:** * **Nerve Supply:** Iliacus is supplied by the Femoral nerve (L2, L3), while Psoas major is supplied by the ventral rami of L1-L3. * **Psoas Sign:** Pain on passive extension of the hip (stretching the iliopsoas) is a clinical sign of an inflamed appendix (Retrocecal appendicitis). * **Psoas Abscess:** Infections (like TB spine/Pott’s disease) can track down the psoas sheath and present as a swelling in the femoral triangle.

Q: Regarding the hip joint, which of the following statements is true?

The capsule is attached to the intertrochanteric line.. **Explanation:** **1. Why Option C is Correct:** The fibrous capsule of the hip joint is a strong, dense structure. Anteriorly, it is attached to the **intertrochanteric line** of the femur. Posteriorly, however, it is attached to the neck of the femur about 1 cm medial to the intertrochanteric crest. This means the entire anterior surface of the femoral neck is intracapsular, while only the medial two-thirds of the posterior surface is intracapsular—a high-yield anatomical detail for fracture classifications. **2. Why the Other Options are Incorrect:** * **Option A:** The **retinacula** are actually longitudinal reflections of the capsule that travel along the neck of the femur. They carry the essential **retinacular arteries** (branches of the medial circumflex femoral artery) which provide the primary blood supply to the head of the femur. * **Option B:** The **Superior Gluteal Nerve** (L4-S1) supplies the primary abductors (Gluteus medius and minimus). The inferior gluteal nerve (L5-S2) supplies the Gluteus maximus, which is the chief extensor of the hip. * **Option D:** The **Iliopsoas** is the most powerful **flexor** of the hip joint, not an abductor. **Clinical Pearls for NEET-PG:** * **Blood Supply:** The medial circumflex femoral artery is the most important source of blood to the femoral head. Damage to retinacular vessels in intracapsular fractures leads to **Avascular Necrosis (AVN)**. * **Stability:** The **Iliofemoral ligament (Ligament of Bigelow)** is the strongest ligament in the body and prevents hyperextension. * **Nerve Supply:** The hip joint follows **Hilton’s Law** and is supplied by the femoral, obturator, and superior gluteal nerves, as well as the nerve to the quadratus femoris.

Q: Largest bursa of the body is?

Ilio-psoas bursa. The **Ilio-psoas bursa** is the largest bursa in the human body. It is located deep to the iliopsoas muscle and superficial to the joint capsule of the hip, extending from the lesser trochanter of the femur to the iliac fossa. In approximately 15% of individuals, it communicates directly with the hip joint cavity. Its primary function is to reduce friction between the iliopsoas tendon and the underlying bony prominences of the pelvis and hip. **Analysis of Options:** * **Suprapatellar bursa:** While it is the largest bursa around the knee joint and frequently communicates with the knee joint cavity, its total surface area and volume are smaller than the iliopsoas bursa. * **Subcoracoid bursa:** This is a small bursa located in the shoulder between the coracoid process and the subscapularis tendon; it is significantly smaller than the major bursae of the lower limb. * **Olecranon bursa:** Located over the posterior aspect of the elbow (olecranon process), it is a superficial bursa prone to inflammation (Student’s elbow) but is relatively small in size. **NEET-PG High-Yield Pearls:** * **Clinical Correlation:** Inflammation of the iliopsoas bursa (Iliopsoas Bursitis) can mimic hip joint pathology or a femoral hernia. * **Housemaid’s Knee:** Inflammation of the **Prepatellar bursa**. * **Clergyman’s Knee:** Inflammation of the **Infrapatellar bursa**. * **Baker’s Cyst:** A synovial fluid collection in the **Popliteal bursa** (medial head of gastrocnemius/semimembranosus bursa).

Q: All of the following are true regarding the great saphenous vein, except:

It runs on the medial side of the leg.. The **Great Saphenous Vein (GSV)** is the longest vein in the body and a frequent topic in NEET-PG anatomy [1]. ### **Analysis of the Question** The question asks for the **exception** (the statement that is **true**), implying that three of the provided options are incorrect. 1. **Why Option A is Correct:** The GSV originates from the medial end of the dorsal venous arch of the foot. It ascends **anterior** to the medial malleolus and continues its course along the **medial side of the leg** and thigh before draining into the femoral vein at the saphenous opening [1]. This is a fundamental anatomical fact. 2. **Why Other Options are Incorrect:** * **Option B:** The GSV runs **anterior** to the medial malleolus, not posterior. (The Small Saphenous Vein runs posterior to the lateral malleolus). * **Option C:** The GSV is accompanied by the **saphenous nerve** (a branch of the femoral nerve) in the leg. The **sural nerve** accompanies the Small Saphenous Vein. * **Option D:** The Achilles tendon (Tendo Achilles) is located **posteriorly** in the midline of the ankle/calcaneus. The GSV is located far **medially and anteriorly** relative to it. ### **High-Yield Clinical Pearls for NEET-PG** * **Venesection Site:** The GSV is most consistently found **2 cm anterior and superior to the medial malleolus**, making it a preferred site for emergency venous cutdown. * **Nerve Injury:** During stripping of the GSV or venesection at the ankle, the **saphenous nerve** is at risk of injury, leading to loss of sensation on the medial side of the foot. * **Valves:** It contains approximately 10–20 valves, with the most functional one located at the **saphenofemoral junction**. * **CABG:** It is the most commonly used vessel for coronary artery bypass grafting due to its length and accessibility.

Q: The peroneal tubercle is a bony landmark found on which bone?

Calcaneum. The **peroneal tubercle** (also known as the peroneal trochlea) is a small, lateral bony projection found on the **calcaneum** (heel bone). The peroneal tubercle is located on the **lateral surface** of the calcaneum. It serves as a vital anatomical landmark that separates the tendons of the **peroneus brevis** and **peroneus longus** muscles as they pass along the lateral side of the foot. * The **peroneus brevis** tendon passes **above** (superior to) the tubercle. * The **peroneus longus** tendon passes **below** (inferior to) the tubercle. * **Cuboid:** While the peroneus longus tendon passes through a groove on the plantar surface of the cuboid, the tubercle itself is located more posteriorly on the calcaneum. * **Talus:** The talus has landmarks like the *sustentaculum tali* (which is actually a part of the calcaneum supporting the talus) and the posterior process, but it does not possess a peroneal tubercle. * **Fibula:** The fibula has a lateral malleolus, but the peroneal tubercle is a feature of the tarsal bones, not the long bones of the leg. * **Sustentaculum Tali:** A shelf-like projection on the **medial** side of the calcaneum that supports the talus and serves as an attachment for the spring ligament. * **Peroneal Groove:** Located on the inferior surface of the **cuboid**; it houses the peroneus longus tendon. * **Clinical Significance:** Hypertrophy of the peroneal tubercle can lead to stenosing tenosynovitis of the peroneal tendons, causing lateral ankle pain. * **Ossification:** The calcaneum is the first tarsal bone to begin ossification (around the 5th month of fetal life).

Question 1

If the anterior cruciate ligament is torn, how does the tibia move relative to the femur?

Accepted Answer

Anteriorly

Answer

Medially

Answer

Laterally

Answer

Posteriorly

Question 2

Which passive movement causes weakness in deep posterior compartment syndrome?

Accepted Answer

Foot inversion

Answer

Foot abduction

Answer

Plantar flexion of foot

Answer

Foot adduction

Question 3

Which of the following ligaments does NOT resist hyperextension of the hip?

Accepted Answer

Sacroiliac ligament

Answer

Ischiofemoral ligament

Answer

Pubofemoral ligament

Answer

Iliofemoral ligament

Question 4

A patient undergoing saphenous cannulation develops sudden onset of pain along the medial border of the ipsilateral foot. Which nerve is most likely to have been accidentally ligated?

Accepted Answer

Saphenous nerve

Answer

Sural nerve

Answer

Deep peroneal nerve

Answer

Genicular nerve

Question 5

Which ligaments provide antero-posterior stability to the knee joint?

Accepted Answer

Cruciate ligaments

Answer

Medial collateral ligament

Answer

Lateral collateral ligament

Answer

Patellar ligaments

Question 6

What is the strongest flexor of the hip joint?

Accepted Answer

Iliopsoas

Answer

Sartorius

Answer

Gluteus maximus

Answer

Pectineus

Question 7

Regarding the hip joint, which of the following statements is true?

Accepted Answer

The capsule is attached to the intertrochanteric line.

Answer

The retinaculum attaches the femur to the hip.

Answer

The inferior gluteal nerve supplies the abductors of the hip.

Answer

The iliopsoas causes abduction of the hip.

Question 8

Largest bursa of the body is?

Accepted Answer

Ilio-psoas bursa

Answer

Suprapatellar bursa

Answer

Subcoracoid bursa

Answer

Olecranon bursa

Question 9

All of the following are true regarding the great saphenous vein, except:

Accepted Answer

It runs on the medial side of the leg.

Answer

It runs posterior to the medial malleolus.

Answer

It is accompanied by the sural nerve.

Answer

The Achilles tendon is medial to the vein.

Question 10

The peroneal tubercle is a bony landmark found on which bone?

Accepted Answer

Calcaneum

Answer

Cuboid

Answer

Talus

Answer

Fibula

Lower Limb — MCQs

Lower Limb — MCQs

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