Lower Limb Practice Questions

Q: Inversion and eversion of the foot occur at which joint(s)?

Subtalar and midtarsal joints. **Explanation:** The movements of inversion and eversion are complex, multi-planar movements that occur primarily at the **Subtalar joint** and the **Transverse Tarsal (Midtarsal) joints**. 1. **Subtalar Joint:** Formed between the inferior surface of the talus and the superior surface of the calcaneus. It is the primary site for these movements. 2. **Midtarsal (Transverse Tarsal) Joint:** Comprises the **talocalcaneonavicular** and **calcaneocuboid** joints. These joints act in synergy with the subtalar joint to increase the range of motion, allowing the forefoot to remain flat on the ground while the hindfoot tilts. **Analysis of Options:** * **Option A (Correct):** Inversion and eversion are not restricted to a single joint; they are a combined effort of the subtalar and midtarsal complexes. * **Option B & D:** These are individual components of the midtarsal joint. While they contribute to the movement, selecting them individually is incomplete. * **Option C:** While the midtarsal joint is involved, it cannot perform the full range of inversion/eversion without the subtalar joint. **NEET-PG High-Yield Pearls:** * **Axis of Movement:** Inversion/Eversion occurs around an **oblique axis**. * **Primary Muscles:** * **Inversion:** Tibialis Anterior and Tibialis Posterior ("The Tibials"). * **Eversion:** Peroneus Longus, Brevis, and Tertius ("The Peroneals"). * **Ankle Joint (Talocrural):** Remember that the ankle joint itself only allows **Dorsiflexion and Plantarflexion** (hinge joint). It does *not* contribute to inversion or eversion. * **Clinical Correlation:** Most ankle sprains occur in **inversion**, damaging the **Anterior Talofibular Ligament (ATFL)**.

Q: The nutrient artery to the femur is a branch of which of the following?

2nd perforating branch of the profunda femoris artery. ### Explanation The nutrient artery is essential for the blood supply to the bone marrow and the inner two-thirds of the cortex. In the femur, the nutrient artery typically enters the bone through the **nutrient foramen** located on the **linea aspera**. **1. Why Option C is Correct:** The femur usually receives its primary nutrient supply from the **2nd perforating artery**, which is a branch of the **profunda femoris artery** (deep artery of the thigh). In some anatomical variations, a second nutrient artery may also arise from the 3rd perforating artery, but the 2nd is the most consistent and standard source taught in human anatomy. **2. Analysis of Incorrect Options:** * **Option A (Inferior gluteal artery):** This artery supplies the gluteus maximus and contributes to the cruciate anastomosis; it does not provide a nutrient branch to the femoral shaft. * **Option B (1st perforating artery):** This branch primarily supplies the adductor muscles and the hamstrings and contributes to the cruciate anastomosis. * **Option D (Lateral circumflex femoral artery):** This artery is crucial for the blood supply to the **head and neck of the femur** (via retinacular branches) but does not supply the shaft's nutrient canal. **3. NEET-PG High-Yield Pearls:** * **Direction of Nutrient Foramen:** In the femur, the nutrient canal is directed **upwards** (away from the knee). Remember the mnemonic: *"To the elbow I go, from the knee I flee."* * **Clinical Significance:** During surgical procedures like intramedullary nailing or open reduction internal fixation (ORIF), preserving the soft tissue near the linea aspera is vital to avoid damaging the nutrient artery, which could lead to delayed union or non-union. * **Profunda Femoris:** It is the chief artery of the thigh, giving off medial/lateral circumflex arteries and four perforating branches.

Q: Which of the following is a compound condylar joint?

Knee. ### Explanation **1. Why the Knee Joint is the Correct Answer:** The knee joint is classified as a **compound condylar synovial joint** (specifically a modified hinge joint). * **Compound:** It involves more than two articulating surfaces: the medial and lateral condyles of the femur, the condyles of the tibia, and the patella. * **Condylar:** The primary movement occurs between the rounded femoral condyles and the relatively flat tibial condyles. It is "modified" because, unlike a simple hinge, it allows for **accessory rotation** (locking and unlocking) during extension and flexion. **2. Analysis of Incorrect Options:** * **B. Temporomandibular Joint (TMJ):** This is a **Bicondylar** joint. While it involves condyles, it is characterized by two separate joints (left and right) that must function simultaneously. It is also unique due to its fibrocartilaginous articular disc. * **C. Wrist Joint (Radiocarpal):** This is an **Ellipsoid** joint. It allows movement in two planes (flexion/extension and abduction/adduction) but does not permit independent rotation. * **D. Elbow Joint:** This is a classic **Hinge (Ginglymus)** joint. It allows movement in only one plane (flexion/extension) between the humerus, ulna, and radius. **3. High-Yield Clinical Pearls for NEET-PG:** * **Locking/Unlocking:** The "Screw-home" mechanism is a key feature of the knee. **Popliteus** is the muscle responsible for **unlocking** the knee by laterally rotating the femur on the fixed tibia. * **Complex vs. Compound:** A *complex* joint contains an intra-articular disc or meniscus (e.g., TMJ, Sternoclavicular). The knee is both **compound** (multiple bones) and **complex** (contains menisci). * **Most Common Site of Injury:** The **Medial Meniscus** is more commonly injured than the lateral because it is fixed to the Medial Collateral Ligament (MCL).

Question 1

A 55-year-old man is admitted to the hospital for an iliofemoral bypass. The operation is performed successfully and the blood flow between the iliac and femoral arteries is restored. During rehabilitation, which of the following arteries should be palpated to monitor good circulation of the lower limb?

Accepted Answer

Dorsalis pedis artery

Answer

Anterior tibial artery

Answer

Deep fibular (peroneal) artery

Answer

Deep plantar artery

Question 2

Inversion and eversion of the foot occur at which joint(s)?

Accepted Answer

Subtalar and midtarsal joints

Answer

Calcaneonavicular joint

Answer

Midtarsal joint

Answer

Calcaneocuboid joint

Question 3

Which compartment of the leg is devoid of a neurovascular bundle?

Accepted Answer

Posterior superficial compartment of leg

Answer

Anterior compartment of leg

Answer

Posterior deep compartment of leg

Answer

Lateral compartment of leg

Question 4

The nutrient artery to the femur is a branch of which of the following?

Accepted Answer

2nd perforating branch of the profunda femoris artery

Answer

Inferior gluteal artery

Answer

1st perforating branch of the profunda femoris artery

Answer

Lateral circumflex femoral artery

Question 5

Which of the following is a compound condylar joint?

Accepted Answer

Knee

Answer

Temporomandibular joint

Answer

Wrist

Answer

Elbow

Lower Limb — MCQs

Lower Limb — MCQs

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