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Pediatric Lower Extremity MCQs

Practice Set 7 of 18

This practice set contains high-yield board review questions covering key concepts in Pediatric Lower Extremity. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 121

Topic: Pediatric Lower Extremity

In the Ponseti method for the conservative treatment of idiopathic clubfoot, sequential correction of the specific deformity components is essential to avoid creating a rocker-bottom foot. Which of the following represents the correct order of deformity correction?

. Cavus, Adductus, Varus, Equinus
. Varus, Cavus, Equinus, Adductus
. Equinus, Varus, Adductus, Cavus
. Adductus, Varus, Cavus, Equinus
. Cavus, Varus, Adductus, Equinus

Correct Answer & Explanation

. Cavus, Adductus, Varus, Equinus

Explanation

The Ponseti method dictates a specific sequence of correction remembered by the acronym CAVE: Cavus (corrected by elevating the first ray), Adductus, Varus, and finally Equinus (which often requires a percutaneous Achilles tenotomy). Correcting equinus before the midfoot is corrected can result in a rocker-bottom deformity.

Question 122

Topic: Pediatric Lower Extremity

In the Ponseti method for correcting idiopathic clubfoot, what is the proper sequence of deformity correction?

. Cavus, Adductus, Varus, Equinus
. Equinus, Varus, Adductus, Cavus
. Varus, Adductus, Cavus, Equinus
. Adductus, Cavus, Varus, Equinus
. Cavus, Varus, Adductus, Equinus

Correct Answer & Explanation

. Cavus, Adductus, Varus, Equinus

Explanation

The Ponseti method dictates sequential correction utilizing the acronym CAVE: Cavus (corrected first by supinating the forefoot), Adductus, Varus, and finally Equinus. Equinus is corrected last and often requires a percutaneous Achilles tenotomy.

Question 123

Topic: Pediatric Lower Extremity

When treating an infant with idiopathic clubfoot (talipes equinovarus) utilizing the Ponseti method of serial casting, the components of the deformity must be addressed in a specific order to prevent midfoot breach and achieve optimal correction. What is the correct sequence of deformity correction?

. Cavus, Adduction, Varus, Equinus
. Equinus, Varus, Adduction, Cavus
. Cavus, Varus, Adduction, Equinus
. Adduction, Cavus, Varus, Equinus
. Varus, Cavus, Adduction, Equinus

Correct Answer & Explanation

. Cavus, Varus, Adduction, Equinus

Explanation

The Ponseti method dictates a strict sequence of correction summarized by the mnemonic CAVE: Cavus (corrected first by elevating the first ray), Adduction (abducting the forefoot with counter-pressure on the head of the talus), Varus (which corrects automatically as the midfoot is abducted), and finally Equinus (corrected last, often requiring a percutaneous Achilles tenotomy).

Question 124

Topic: Pediatric Lower Extremity

During the Ponseti method for correcting idiopathic clubfoot (talipes equinovarus), the manipulation sequence dictates a highly specific order of correction. Which of the following components of the deformity is corrected FIRST?

. Equinus
. Hindfoot varus
. Forefoot adduction
. Midfoot cavus
. Tibial internal torsion

Correct Answer & Explanation

. Midfoot cavus

Explanation

The Ponseti method corrects clubfoot deformities in the mnemonic sequence 'CAVE': Cavus, Adduction, Varus, Equinus. The very first step is to elevate the first ray to supinate the forefoot, thereby correcting the midfoot Cavus. Next, forefoot adduction and hindfoot varus are corrected simultaneously by abducting the foot around the head of the talus.

Question 125

Topic: Pediatric Lower Extremity

During the initial phase of the Ponseti method for correcting idiopathic clubfoot in an infant, the cavus deformity must be addressed first. Which specific anatomical structure serves as the fulcrum for the thumb of the physician while supinating the forefoot to correct the cavus?

. The calcaneocuboid joint
. The lateral malleolus
. The head of the talus
. The navicular tuberosity
. The sustentaculum tali

Correct Answer & Explanation

. The head of the talus

Explanation

In the Ponseti technique, the first step is to correct the cavus by supinating the forefoot and elevating the first ray. To achieve this, the physician's thumb must be placed on the lateral aspect of the head of the talus to act as a fulcrum while the forefoot is abducted. Placing pressure on the calcaneocuboid joint (a common mistake) prevents the calcaneus from abducting and leads to a rocker-bottom deformity.

Question 126

Topic: Pediatric Lower Extremity

When applying the Ponseti method for the correction of idiopathic congenital talipes equinovarus (clubfoot), which of the following represents the correct sequence of deformity correction?

. Equinus, Varus, Adductus, Cavus
. Cavus, Adductus, Varus, Equinus
. Adductus, Varus, Cavus, Equinus
. Varus, Cavus, Adductus, Equinus
. Cavus, Equinus, Adductus, Varus

Correct Answer & Explanation

. Cavus, Adductus, Varus, Equinus

Explanation

The Ponseti method corrects the deformities of clubfoot in a specific sequence, remembered by the acronym CAVE: Cavus (corrected by elevating the first ray to supinate the forefoot), Adductus, Varus, and finally Equinus. Equinus is corrected last, often requiring a percutaneous Achilles tenotomy once the foot is abducted to about 60 degrees.

Question 127

Topic: Pediatric Lower Extremity

During the Ponseti method for correcting idiopathic clubfoot, what is the final deformity to be corrected?

. Cavus
. Adductus
. Varus
. Equinus
. Internal rotation

Correct Answer & Explanation

. Cavus

Explanation

The order of correction in the Ponseti method is CAVE: Cavus (corrected first by supinating the forefoot to align with the hindfoot), Adductus, Varus, and finally Equinus (which often requires a percutaneous Achilles tenotomy).

Question 128

Topic: Pediatric Lower Extremity
A 4-year-old child who was successfully treated for idiopathic clubfoot with the Ponseti method presents with dynamic supination of the foot during the swing phase of gait. Passive dorsiflexion is 15 degrees. What is the most appropriate management?
. Repeat percutaneous tendo-Achilles lengthening
. Split anterior tibial tendon transfer (SPLATT)
. Full anterior tibial tendon transfer to the lateral cuneiform
. Cuboid decancellation
. Triple arthrodesis

Correct Answer & Explanation

. Full anterior tibial tendon transfer to the lateral cuneiform

Explanation

Dynamic supination in a treated clubfoot is typically due to an overpowering anterior tibial tendon relative to the evertors. The treatment of choice for a flexible foot with dynamic supination without equinus is a full transfer of the anterior tibial tendon (TATT) to the lateral cuneiform. A SPLATT is generally reserved for adult neurogenic conditions like stroke or CP.

Question 129

Topic: Pediatric Lower Extremity

A 2-week-old infant is undergoing serial casting for a severe idiopathic clubfoot using the Ponseti method. According to the principles of this technique, which component of the deformity is corrected last and typically requires a percutaneous tenotomy?

. Cavus
. Adductus
. Varus
. Equinus
. Supination

Correct Answer & Explanation

. Equinus

Explanation

The Ponseti method addresses clubfoot deformities in the order of the CAVE acronym: Cavus, Adductus, Varus, and finally Equinus. The cavus is corrected first by elevating the first ray (supinating the forefoot). Equinus is corrected last, and an Achilles tenotomy is required in approximately 80-90% of cases to achieve adequate dorsiflexion.

Question 130

Topic: Pediatric Lower Extremity

The Ponseti method is the gold standard for the treatment of idiopathic clubfoot (talipes equinovarus). The deformity is corrected through a series of specific manipulations and serial casting. According to the strictly defined Ponseti protocol, what is the very first component of the deformity that must be addressed and corrected during the first cast?

. Cavus
. Adduction
. Varus
. Equinus
. Supination

Correct Answer & Explanation

. Cavus

Explanation

The Ponseti method follows a precise order of correction, often remembered by the acronym CAVE: Cavus, Adduction, Varus, Equinus. The very first step involves correcting the cavus deformity, which is driven by a pronated forefoot relative to the hindfoot. To correct the cavus, the first metatarsal must be elevated (supinating the forefoot) to align it with the midfoot and hindfoot, establishing a normal longitudinal arch before the rest of the deformities are swung outwards.

Question 131

Topic: Pediatric Lower Extremity

When applying the Ponseti method for the correction of idiopathic clubfoot, which of the following describes the correct order of deformity correction?

. Cavus, adductus, varus, equinus
. Equinus, varus, adductus, cavus
. Adductus, varus, cavus, equinus
. Cavus, equinus, adductus, varus
. Varus, cavus, equinus, adductus

Correct Answer & Explanation

. Cavus, equinus, adductus, varus

Explanation

The sequence of correction in the Ponseti method follows the acronym CAVE: Cavus (corrected first by supinating the forefoot and elevating the first ray to align it with the hindfoot), Adductus, Varus (corrected simultaneously by abducting the foot around the fixed talar head), and finally Equinus (which is corrected last and often requires a percutaneous Achilles tenotomy).

Question 132

Topic: Pediatric Lower Extremity

According to the Ponseti method for the treatment of idiopathic clubfoot, the initial casting phase prioritizes the correction of the cavus deformity. Which specific manipulation is required to achieve this correction?

. Pronating the forefoot to align with the hindfoot
. Dorsiflexing the first ray with direct pressure under the metatarsal head
. Elevating the first ray to supinate the forefoot and align it with the hindfoot
. Abducting the forefoot with counter-pressure on the lateral calcaneus
. Plantarflexing the ankle to correct the equinus first

Correct Answer & Explanation

. Elevating the first ray to supinate the forefoot and align it with the hindfoot

Explanation

The deformities in clubfoot are remembered by the acronym CAVE (Cavus, Adductus, Varus, Equinus). Cavus is the first deformity to be corrected. It is caused by a plantarflexed first ray relative to the hindfoot. To correct this, the first ray must be elevated, which effectively supinates the forefoot so that it is in alignment with the supinating hindfoot. Pronating the forefoot (a common mistake) worsens the cavus.

Question 133

Topic: Pediatric Lower Extremity

A 2-week-old infant with idiopathic clubfoot is undergoing correction via the Ponseti method. The treating physician applies the first cast. According to Ponseti principles, what is the primary goal of the very first cast application?

. Correction of the cavus deformity by elevating the first ray
. Correction of the forefoot adductus by manipulating the metatarsals
. Correction of the hindfoot varus by abducting the foot
. Correction of the hindfoot equinus by dorsiflexing the ankle
. Correction of internal tibial torsion

Correct Answer & Explanation

. Correction of the cavus deformity by elevating the first ray

Explanation

The Ponseti method corrects the components of clubfoot in a specific sequence: Cavus, Adductus, Varus, and Equinus (CAVE). The first step requires elevation of the first ray (dorsiflexion of the first metatarsal) to correct the forefoot cavus. This aligns the forefoot with the hindfoot, allowing the foot to be treated as a single unit during subsequent abduction.

Question 134

Topic: Pediatric Lower Extremity

When treating congenital idiopathic clubfoot (talipes equinovarus) using the Ponseti method, what is the correct sequence of deformity correction during serial casting?

. Equinus, Varus, Adductus, Cavus
. Cavus, Adductus, Varus, Equinus
. Varus, Cavus, Equinus, Adductus
. Adductus, Cavus, Equinus, Varus
. Equinus, Adductus, Varus, Cavus

Correct Answer & Explanation

. Cavus, Adductus, Varus, Equinus

Explanation

The Ponseti method involves sequential correction of the clubfoot deformities using the mnemonic CAVE: Cavus (corrected first by elevating the first ray), Adductus, Varus, and finally Equinus. The equinus deformity is corrected last, often requiring a percutaneous Achilles tenotomy if dorsiflexion remains limited after the other deformities have been corrected.

Question 135

Topic: Pediatric Lower Extremity

The Ponseti method is the recognized gold standard for the conservative treatment of idiopathic clubfoot. According to this protocol, what is the very first component of the deformity that must be corrected during the initial casting phase?

. Adductus
. Equinus
. Varus
. Cavus
. Internal tibial torsion

Correct Answer & Explanation

. Cavus

Explanation

The Ponseti method follows the CAVE mnemonic for the order of correction: Cavus, Adductus, Varus, Equinus. The very first step involves correcting the high arch (cavus) by elevating the first ray to align the forefoot with the hindfoot, which provides a solid lever arm to subsequently correct the adductus and varus.

Question 136

Topic: Pediatric Lower Extremity

In the Ponseti method for the treatment of idiopathic clubfoot, the sequence of deformity correction is critical for a successful outcome. Which of the following represents the correct first step in the manipulation and casting process?

. Dorsiflexion of the ankle to correct equinus
. Abduction of the forefoot to correct adductus
. Pronation of the forefoot to correct varus
. Elevation of the first ray to correct cavus
. Eversion of the calcaneus to correct hindfoot varus

Correct Answer & Explanation

. Elevation of the first ray to correct cavus

Explanation

The sequence of correction in the Ponseti method follows the acronym CAVE: Cavus, Adductus, Varus, Equinus. The very first step must be the correction of the cavus deformity. This is achieved by elevating the first ray (supinating the forefoot), which aligns the forefoot with the hindfoot. Pronating the forefoot, a common error, worsens the cavus deformity.

Question 137

Topic: Pediatric Lower Extremity

The Ponseti method is the internationally recognized gold standard for the conservative management of idiopathic clubfoot (talipes equinovarus). What is the correct sequence of deformity correction during serial casting in this technique?

. Cavus, Adductus, Varus, Equinus (CAVE)
. Equinus, Varus, Adductus, Cavus (EVAC)
. Cavus, Varus, Equinus, Adductus (CVEA)
. Adductus, Varus, Cavus, Equinus (AVCE)
. Varus, Cavus, Adductus, Equinus (VCAE)

Correct Answer & Explanation

. Cavus, Adductus, Varus, Equinus (CAVE)

Explanation

The Ponseti method sequentially corrects the deformities of clubfoot using the acronym CAVE: first Cavus (by elevating the first ray to align the forefoot with the midfoot), then Adductus and Varus (simultaneously by abducting the midfoot around the talar head), and finally Equinus (usually requiring a percutaneous Achilles tenotomy).

Question 138

Topic: Pediatric Lower Extremity

According to the Ponseti method for the serial casting of idiopathic clubfoot, what is the correct sequential order of deformity correction?

. Cavus, Adductus, Varus, Equinus
. Equinus, Varus, Adductus, Cavus
. Adductus, Varus, Equinus, Cavus
. Cavus, Varus, Adductus, Equinus
. Varus, Cavus, Equinus, Adductus

Correct Answer & Explanation

. Cavus, Varus, Adductus, Equinus

Explanation

The Ponseti method follows a strict sequence to correct the complex 3D deformity of a clubfoot, easily remembered by the acronym CAVE: Cavus, Adductus, Varus, Equinus. The cavus is corrected first by supinating the forefoot to align it with the hindfoot (elevating the first ray). Then the midfoot adductus and hindfoot varus are corrected together by abducting the foot around the fixed talar head. Finally, equinus is corrected, which often requires a percutaneous Achilles tenotomy.

Question 139

Topic: Pediatric Lower Extremity

In the Ponseti method for the treatment of congenital idiopathic clubfoot, what is the correct sequence of deformity correction?

. Cavus, Adductus, Varus, Equinus
. Equinus, Varus, Adductus, Cavus
. Varus, Cavus, Adductus, Equinus
. Adductus, Varus, Cavus, Equinus
. Cavus, Varus, Adductus, Equinus

Correct Answer & Explanation

. Cavus, Adductus, Varus, Equinus

Explanation

The Ponseti method systematically corrects clubfoot deformities in a specific sequence, remembered by the acronym CAVE: Cavus, Adductus, Varus, and Equinus. The first cast supinates the forefoot to align it with the midfoot and hindfoot, correcting the cavus. Subsequent casts correct adductus and varus by abducting the supinated foot around the head of the talus. Equinus is corrected last, often requiring a percutaneous Achilles tenotomy.

Question 140

Topic: Pediatric Lower Extremity

During the Ponseti method for the conservative correction of idiopathic clubfoot (talipes equinovarus), the components of the deformity are addressed in a specific sequence. What is the very first component of the deformity that must be corrected during the initial casting phase?

. Equinus
. Varus of the hindfoot
. Cavus
. Adduction of the forefoot
. Tibial torsion

Correct Answer & Explanation

. Cavus

Explanation

The Ponseti method dictates a specific order of correction summarized by the acronym CAVE: Cavus, Adductus, Varus, Equinus. The first step is to correct the Cavus by elevating the first ray to align the forefoot with the hindfoot, establishing a solid lever arm for subsequent correction.

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