Gait Analysis — MCQs
Which of the following phases are directly involved in the recovery phase of the disaster cycle?
The kinetic energy of the body is least in one of the following phases of the walking cycle
Charlie Chaplin gait is seen in?
Lurching Gait is due to paralysis of which of the following?
Intention tremor, drunken gait and scanning speech together point towards involvement of
What condition is characterized by a waddling gait?
The following gait is seen due to weakness of:
Combination of appearance in CTEV
What is the latent period in distraction osteogenesis?
Bone resorption is enhanced by which of the following?
Gait Analysis Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following phases are directly involved in the recovery phase of the disaster cycle?
- A. Response and Rehabilitation
- B. Mitigation and Rehabilitation
- C. Response and Preparedness
- D. Rehabilitation and Reconstruction (Correct Answer)
Explanation: ***Rehabilitation and Reconstruction*** - **Rehabilitation** is the short-term recovery phase focusing on restoring essential services, providing temporary shelter, medical care, and supporting affected populations to resume normal activities. - **Reconstruction** is the long-term recovery phase involving rebuilding damaged infrastructure, permanent housing, economic restoration, and development improvements. - These two phases together constitute the **recovery phase** of the disaster cycle according to standard disaster management frameworks (WHO, NDMA). *Mitigation and Rehabilitation* - While **rehabilitation** is correctly part of recovery, **mitigation** is traditionally considered a separate continuous phase or part of preparedness, focused on reducing future disaster risks. - **Mitigation** measures are implemented throughout the disaster cycle, not specifically as a direct component of the recovery phase. *Response and Rehabilitation* - **Response** refers to immediate life-saving actions during and immediately after a disaster (search and rescue, emergency medical care, evacuation). - **Response** precedes the recovery phase and is distinct from it, though **rehabilitation** is indeed part of recovery. *Response and Preparedness* - **Preparedness** involves planning, training, and resource allocation before a disaster occurs. - **Response** is the immediate action during/after the disaster. - Neither constitutes the recovery phase, which follows after the immediate response is complete.
Question 2: The kinetic energy of the body is least in one of the following phases of the walking cycle
- A. Double support
- B. Mid-stance (Correct Answer)
- C. Toe-off
- D. Heel strike
Explanation: ***Mid-stance*** - During **mid-stance**, the body's center of gravity is at its **highest point**, and the vertical velocity is near zero as the body transitions from upward to downward motion, contributing to **reduced kinetic energy**. - At this phase, forward velocity is relatively constant but the body is at the apex of its vertical trajectory, representing a point of **minimal total kinetic energy** in the sagittal plane. - The body transitions from deceleration to acceleration, with the limb providing stable support as weight passes over the stance foot. *Double support* - In **double support**, both feet are on the ground during the weight transfer phase, and the body's center of gravity is at a lower position compared to mid-stance. - While some energy is dissipated during weight transfer, this phase involves active muscular work and forward momentum maintenance, with kinetic energy being variable. - This represents a transition phase between single support periods, with complex energy exchanges occurring. *Toe-off* - At **toe-off**, the propulsive phase of gait, the body is generating forward momentum with peak forward velocity, meaning there is **significant kinetic energy** as the foot pushes off the ground. - The body's center of gravity is moving upwards and forwards, indicating a higher kinetic energy state. - Ankle plantarflexors are actively propelling the body forward, maximizing kinetic energy output. *Heel strike* - **Heel strike** is a moment of initial contact where the body's forward velocity is still considerable, possessing **significant kinetic energy**. - The limb is preparing to absorb impact forces while the body's center of mass continues moving forward, representing high kinetic energy just before the deceleration phase. - This marks the beginning of the stance phase with substantial horizontal velocity maintained from the swing phase.
Question 3: Charlie Chaplin gait is seen in?
- A. DDH
- B. Tibial torsion (Correct Answer)
- C. Genu valgus
- D. Congenital coxa vara
Explanation: ***Tibial torsion*** - **Tibial torsion** typically causes an out-toeing gait, where the feet are externally rotated, mimicking the classic Charlie Chaplin gait. - This condition involves a rotational deformity of the **tibial bone**, leading to an altered foot progression angle during walking. *DDH* - **Developmental dysplasia of the hip (DDH)** usually presents with a **Trendelenburg gait** if unilateral, or a waddling gait if bilateral, due to hip instability. - It involves abnormal development of the **hip joint**, leading to dislocation or subluxation, rather than an out-toeing pattern. *Genu valgus* - **Genu valgus** (knock-knees) causes the knees to touch or come very close together while the ankles remain apart. - This condition generally leads to an ungainly gait with the feet often wide apart to maintain balance, not an out-toeing characteristic. *Congenital coxa vara* - **Congenital coxa vara** is characterized by a decreased angle between the femoral neck and shaft, leading to a shortened leg and often a **Trendelenburg gait**. - It can result in a functionally shorter limb and a characteristic limp, but not typically the exaggerated out-toeing seen in Charlie Chaplin gait.
Question 4: Lurching Gait is due to paralysis of which of the following?
- A. Gluteus medius (Correct Answer)
- B. Adductor magnus
- C. Hamstrings
- D. Quadriceps femoris
Explanation: ***Gluteus medius*** * Paralysis of the **gluteus medius** leads to a **Trendelenburg gait** or **lurching gait**, where the pelvis drops on the unsupported side during walking. * This muscle is crucial for **stabilizing the pelvis** during the single-limb support phase of gait. *Adductor Magnus* * Paralysis of the adductor magnus would primarily affect **thigh adduction** and extension, not directly causing a lurching gait. * Problems with this muscle might impact the ability to bring the legs together or stabilize the leg during certain movements. *Hamstrings* * The hamstrings are responsible for **knee flexion** and **hip extension**. * Paralysis would result in difficulty bending the knee and limited hip extension, potentially leading to a stiff-knee gait, but not typically a lurching gait. *Quadriceps femoris* * The quadriceps femoris is essential for **knee extension** and is critical for activities like standing, walking, and climbing stairs. * Paralysis would cause the knee to buckle, leading to a **knee-hyperflexion gait** or difficulty with weight-bearing on that leg.
Question 5: Intention tremor, drunken gait and scanning speech together point towards involvement of
- A. Medulla
- B. Midbrain
- C. Cerebellum (Correct Answer)
- D. Cerebral cortex
Explanation: ***Cerebellum*** - **Intention tremor**, **drunken gait (ataxia)**, and **scanning speech (dysarthria)** are classic signs of **cerebellar dysfunction** [1]. The cerebellum is crucial for coordinating voluntary movements, balance, and motor learning [2]. - Damage to the cerebellum impairs the brain's ability to smoothly execute movements and maintain posture, leading to these characteristic symptoms [2]. *Medulla* - The medulla oblongata primarily controls vital autonomic functions such as **breathing**, **heart rate**, and **blood pressure**. - While damage to the medulla can cause neurological deficits, it typically presents with problems in these vital functions, cranial nerve palsies, or specific sensory/motor deficits, not the classic triad of cerebellar signs. *Midbrain* - The midbrain plays a role in **motor control**, **eye movements**, and processing **auditory and visual information**. - Lesions in the midbrain commonly result in symptoms like oculomotor deficits, pupillary abnormalities, and specific motor pathways involvement (e.g., Parkinsonian symptoms if substantia nigra is affected), rather than the cerebellar signs mentioned. *Cerebral cortex* - The cerebral cortex is responsible for higher cognitive functions, voluntary movement initiation, sensory perception, and language. - Damage to the cerebral cortex typically leads to symptoms such as **hemiparesis**, **aphasia**, **sensory loss**, or **cognitive deficits**, which are distinct from the signs of cerebellar involvement.
Question 6: What condition is characterized by a waddling gait?
- A. Bilateral congenital dysplasia of hip (Correct Answer)
- B. Coxa valga
- C. CTEV
- D. Muscular dystrophy
Explanation: ***Bilateral congenital dysplasia of hip*** - A **waddling gait**, also known as a **Trendelenburg gait**, occurs due to weakness of the hip abductor muscles (gluteus medius and minimus) on both sides. - In bilateral congenital dysplasia of the hip, the **femoral heads are poorly seated** or dislocated, leading to ineffective abductor function and the characteristic gait. *Coxa valga* - This condition involves an **increased angle** between the femoral neck and shaft, which can alter biomechanics but does not typically cause a waddling gait in isolation. - While it can be associated with other hip pathologies, **coxa valga itself is not the primary cause** of a waddling gait. *CTEV* - **CTEV (Congenital Talipes Equinovarus)**, or **clubfoot**, is a deformity of the foot and ankle, not the hip. - It affects the patient's ability to walk normally, but results in a different type of gait abnormality, typically involving limping or walking on the outer edge of the foot, **not a waddling gait**. *Muscular dystrophy* - While many forms of muscular dystrophy can lead to a waddling gait due to **proximal muscle weakness**, it is a broad category of genetic disorders. - Without further context or specific type of muscular dystrophy, **bilateral congenital hip dysplasia is a more direct and specific cause** for the symptom described.
Question 7: The following gait is seen due to weakness of:
- A. Gluteus maximus
- B. Gluteus medius (Correct Answer)
- C. Psoas major
- D. Tibialis anterior
Explanation: ***Gluteus medius*** - Weakness of the **gluteus medius** leads to a **Trendelenburg gait**, where the pelvis drops on the unsupported side during the swing phase of gait. - The image suggests pelvic tilting, which is characteristic of the body attempting to compensate for the inability of the gluteus medius to stabilize the pelvis. *Gluteus maximus* - Weakness of the gluteus maximus causes difficulty in **hip extension**, resulting in a **lurching gait** where the trunk is thrown backward at heel strike. - This is commonly known as a **gluteus maximus lurch**, which is not depicted in an obvious manner here. *Psoas major* - Weakness of the psoas major would primarily affect **hip flexion**, making it difficult to lift the leg off the ground (e.g., during the swing phase). - This would result in compensatory movements such as circumduction or hiking the hip, rather than the characteristic pelvic drop. *Tibialis anterior* - Weakness of the tibialis anterior causes **foot drop**, leading to a **steppage gait** where the knee is lifted high to avoid dragging the foot. - The image does not show a foot drop or high stepping, thus ruling out tibialis anterior weakness.
Question 8: Combination of appearance in CTEV
- A. Equinus, eversion, forefoot adduction, cavus
- B. Equinus, inversion, forefoot adduction, planus
- C. Equinus, inversion, forefoot adduction, cavus (Correct Answer)
- D. Equinus, eversion, forefoot abduction, cavus
Explanation: ***Equinus, inversion, forefoot adduction, cavus*** - The classic presentation of **clubfoot** (CTEV) involves a characteristic combination of deformities: **equinus** (fixed plantarflexion of the ankle), **inversion** (tilting of the heel inward), **forefoot adduction** (inward turning of the front of the foot), and **cavus** (an abnormally high arch). - These four components are essential for the diagnosis and classification of CTEV. *Equinus, eversion, forefoot adduction, cavus* - This option incorrectly lists **eversion** instead of inversion. Eversion involves the outward tilting of the heel and is not a feature of CTEV. - While equinus, forefoot adduction, and cavus are typical, the presence of eversion rules out classic CTEV. *Equinus, inversion, forefoot adduction, planus* - This option incorrectly lists **planus** (pes planus or flatfoot) instead of cavus. Cavus (high arch) is a defining characteristic of CTEV, not a flatfoot. - While equinus, inversion, and forefoot adduction are correct, the presence of planus makes this option incorrect. *Equinus, eversion, forefoot abduction, cavus* - This option incorrectly lists both **eversion** and **forefoot abduction**. Eversion is the outward tilting of the heel, and forefoot abduction is the outward turning of the front of the foot. - Both eversion and forefoot abduction are opposite to the deformities seen in classical CTEV.
Question 9: What is the latent period in distraction osteogenesis?
- A. 4-6 weeks
- B. 5-7 days (Correct Answer)
- C. 6-8 months
- D. 4 months
Explanation: **Explanation:** **Distraction Osteogenesis** (Ilizarov technique) is a process of growing new bone by mechanically stretching a vascularized callus. The procedure follows a specific chronological sequence: 1. **Latent Period (The Correct Answer):** This is the duration between the corticotomy (surgical bone cut) and the commencement of distraction. It typically lasts **5–7 days**. This period allows for the inflammatory phase of bone healing to occur and for the initial soft tissue/callus bridge to form. Starting distraction too early (before 5 days) can lead to poor callus formation, while starting too late (after 10–14 days) may result in premature consolidation (early fusion). 2. **Distraction Phase:** The bone is stretched at a rate of **1 mm per day**, usually divided into four increments (0.25 mm every 6 hours). 3. **Consolidation Phase:** The period where the newly formed "regenerate" bone mineralizes and hardens. **Analysis of Incorrect Options:** * **A (4-6 weeks):** This is the typical time for clinical union in simple fractures, not the latent period for distraction. * **C & D (6-8 months / 4 months):** These timeframes are more representative of the total duration an Ilizarov fixator might remain on a limb for complex lengthening or non-union treatments. **High-Yield Clinical Pearls for NEET-PG:** * **The Law of Tension-Stress:** Proposed by Ilizarov, stating that gradual traction on living tissues stimulates and maintains the regeneration and growth of those tissues. * **Rate of Distraction:** 1 mm/day is the gold standard. <0.5 mm/day leads to premature fusion; >2 mm/day leads to non-union and nerve damage. * **Most common complication:** Pin tract infection. * **Best site for corticotomy:** Metaphysis (due to superior vascularity and osteogenic potential).
Question 10: Bone resorption is enhanced by which of the following?
- A. PGD2
- B. PDF2
- C. PGE2 (Correct Answer)
- D. PGI2
Explanation: **Explanation:** Bone remodeling is a dynamic process regulated by various systemic hormones and local inflammatory mediators. Prostaglandins, which are derivatives of arachidonic acid, play a significant role in this process. **Why PGE2 is the Correct Answer:** **Prostaglandin E2 (PGE2)** is the most potent stimulator of bone resorption among the prostaglandins. It acts by stimulating the **RANKL (Receptor Activator of Nuclear Factor kappa-B Ligand)** expression in osteoblasts. This RANKL then binds to RANK receptors on osteoclast precursors, leading to their maturation and activation. While PGE2 has a dual role (it can also stimulate bone formation in certain concentrations), its primary clinical significance in inflammatory states (like rheumatoid arthritis or periodontal disease) is the induction of osteoclastogenesis and subsequent bone loss. **Analysis of Incorrect Options:** * **PGD2 (Prostaglandin D2):** Primarily involved in smooth muscle relaxation and allergic responses; it does not have a significant stimulatory effect on bone resorption. * **PGF2α (often mislabeled as PDF2):** While it can influence bone metabolism, it is significantly less potent than PGE2 and is more associated with uterine contraction. * **PGI2 (Prostacyclin):** Mainly acts as a potent vasodilator and inhibitor of platelet aggregation; it has minimal to no role in enhancing bone resorption. **High-Yield Clinical Pearls for NEET-PG:** * **NSAIDs and Bone:** Since NSAIDs inhibit prostaglandin synthesis (COX inhibition), they can theoretically delay fracture healing by reducing PGE2-mediated bone remodeling. * **IL-1 and TNF-α:** These cytokines also enhance bone resorption by stimulating PGE2 production. * **Bisphosphonates:** These are the drugs of choice to *inhibit* bone resorption by inducing osteoclast apoptosis.
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