Pediatric Lower Extremity MCQs

In the Ponseti method for the treatment of idiopathic clubfoot, what is the strictly required sequence of deformity correction during serial casting?

An infant with a severe idiopathic clubfoot is being treated with the Ponseti method of serial casting. The physician is manipulating the foot to correct the sequence of deformities. What is the final deformity to be corrected, often requiring a percutaneous tenotomy?

In the Ponseti method for clubfoot casting, which of the following represents the correct sequential order of deformity correction?

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

During the Ponseti casting treatment for a rigid idiopathic clubfoot in a 4-week-old infant, the midfoot has been fully abducted. The heel varus has resolved, and the forefoot is abducted to 70 degrees. However, ankle dorsiflexion remains at -10 degrees. What is the correct next step in management?

A 2-year-old girl presents with bilateral bowing of the lower extremities.

Radiographs show medial beaking of the proximal tibial metaphysis. Which radiographic measurement is most reliable in differentiating infantile Blount's disease from physiologic genu varum?

A newborn male is diagnosed with idiopathic talipes equinovarus (clubfoot). The parents are counseled on the standard of care for initial management. Which of the following best describes the primary treatment modality?

A 2-week-old male is evaluated for rigid bilateral idiopathic clubfoot. According to the Ponseti method, what is the initial biomechanical step in the manipulative reduction before applying the first cast?

While most forms of Multiple Epiphyseal Dysplasia (MED) are autosomal dominant, an autosomal recessive form exists due to mutations in the SLC26A2 gene (diastrophic dysplasia sulfate transporter). Which of the following clinical features is characteristic of this specific recessive variant and helps distinguish it from dominant MED?

A 2-week-old male infant is brought to the clinic for evaluation of bilateral foot deformities present since birth. Examination reveals equinus of the ankle, varus of the hindfoot, adductus of the forefoot, and cavus of the midfoot. The physician decides to initiate the Ponseti method of serial casting. Which of the following describes the correct sequence of deformity correction in this method?

A 12-year-old male soccer player complains of anterior knee pain that worsens with running and jumping. On examination, there is localized tenderness and swelling directly over the tibial tubercle. Radiographs show fragmentation of the tibial tubercle apophysis. What is the most likely diagnosis?

A newborn male is evaluated in the nursery and found to have a rigid, inward-turning left foot. The deformity consists of midfoot cavus, forefoot adductus, hindfoot varus, and hindfoot equinus. The Ponseti method of serial casting is initiated. What is the correct sequence of deformity correction in the Ponseti method?

A 2-week-old male presents with idiopathic clubfoot (talipes equinovarus). The orthopedic surgeon plans to initiate treatment using the Ponseti method. Which of the following is the essential first step when applying the first series of casts?

A 12-year-old boy undergoing tibial lengthening with a circular external fixator experiences premature consolidation of the bony regenerate. Which of the following factors most strongly predisposes to this specific complication?

In a patient diagnosed with Proximal Focal Femoral Deficiency (PFFD), which of the following clinical factors is the most critical determinant when deciding between a reconstructive limb-lengthening program versus an early amputation with rotationplasty?

A patient with long-standing, severe Blount's disease undergoes lower extremity deformity planning. Analysis of a standing long-leg radiograph reveals a mechanical lateral distal femoral angle (mLDFA) of 88 degrees and a mechanical proximal tibial angle (MPTA) of 72 degrees. Where is the mechanical axis deviation (MAD)?

A 2-year-old child is evaluated for bilateral genu varum. Which of the following radiographic parameters best differentiates infantile Blount's disease from physiologic bowing?

A 7-year-old girl presents with frequent tripping and an intoeing gait. Examination shows hip internal rotation of 85 degrees and external rotation of 10 degrees bilaterally. What is the most likely diagnosis and its natural history?

A 5-year-old girl is evaluated for an in-toeing gait. Examination reveals internal hip rotation of 85 degrees, external hip rotation of 10 degrees, and a thigh-foot angle of +10 degrees. What is the primary anatomical cause of her rotational profile?