Identification:

• Congenital Talipes Equinovarus (CTEV / Clubfoot).

Mnemonic CAVE (Components of deformity corrected in sequential order):

• C - Cavus (high medial arch due to pronation of forefoot in relation to hindfoot; corrected first by elevating 1st metatarsal / supinating forefoot).
• A - Adductus (forefoot and midfoot adducted relative to hindfoot; corrected by lateral abduction with counterpressure on lateral head of talus).
• V - Varus (hindfoot / calcaneus inverted; corrected simultaneously with abduction).
• E - Equinus (fixed plantarflexion at ankle; corrected last, usually via percutaneous Achilles tenotomy).

Risk factors & Associations:

• Idiopathic (most common, multifactorial inheritance, male:female ratio 2:1)
• Positive family history
• Intrauterine compression (oligohydramnios, multiple pregnancy)
• Neuromuscular conditions: Myelomeningocele / Spina bifida, Arthrogryposis multiplex congenita, Spinal Muscular Atrophy.

Spinal Examination:

• Examine the lumbosacral spine for cutaneous markers of Spinal Dysraphism / Spina Bifida Occulta (e.g., sacral dimple/sinus, hypertrichosis / hairy patch, subcutaneous lipoma, hemangioma, deviated gluteal cleft).

Treatment according to age:

• Timing: Non-operative treatment should start as early as possible, ideally in the first 1 to 2 weeks of life.
• Neonates to 2 years: Ponseti method (serial gentle manipulations and long-leg plaster casting followed by bracing).
• Late / Neglected cases (>2–3 years): Comprehensive posteromedial soft tissue release (Turco procedure), osteotomies, or Ilizarov external fixation.

Ponseti Method:

• Gold standard conservative method:
  • Serial weekly long-leg plaster casts (correcting Cavus $\to$ Adductus $\to$ Varus by abducting foot around a stabilized talar head).
  • Percutaneous Achilles tenotomy under local anesthesia in $>90\mathrm{\%}$ of cases to correct residual equinus.
  • Final cast worn for 3 weeks post-tenotomy.
  • Steenbeek / Denis Browne foot abduction brace (FAB) worn 23 hours/day for 3 months, then during naps and night-time until 4–5 years of age to prevent relapse.

Identification:

• Congenital Vertical Talus (CVT / Rocker-Bottom Foot / Congenital Convex Pes Valgus).

Common Etiologies (at least 4):

• Idiopathic (isolated)
• Chromosomal trisomies: Trisomy 18 (Edwards syndrome), Trisomy 13 (Patau syndrome)
• Arthrogryposis multiplex congenita
• Myelomeningocele / Spinal dysraphism
• Spinal Muscular Atrophy (SMA)
• Neurofibromatosis Type 1 (NF-1).

Associated anatomical problems & contractures:

• Rigid dorsal dislocation of the navicular on the head of the vertically oriented talus.
• Severe contracture of the Achilles tendon (tendoachilles equinus).
• Severe contracture of anterior tibial tendons (tibialis anterior, extensor digitorum longus, extensor hallucis longus, peroneus brevis) holding the forefoot in rigid dorsiflexion against the anterior tibia.

Treatment:

• Start immediately in the early neonatal period (first weeks of life).
• Reverse Ponseti (Dobbs) technique: Serial manipulations and long-leg plaster casting in plantarflexion and inversion/adduction, followed by minimally invasive percutaneous/small-incision talonavicular pin fixation and percutaneous Achilles tenotomy.

Problem:

• Genu Varum (Bow Legs) / Infantile Tibia Vara (Blount Disease).

Differential diagnoses:

• Physiological Genu Varum (Physiological bowing)
• Blount Disease (Tibia Vara - Infantile or Adolescent)
• Nutritional Rickets (Vitamin D deficiency) or Hypophosphatemic Rickets
• Skeletal dysplasias (Achondroplasia, Hypochondroplasia, Metaphyseal chondrodysplasia)
• Asymmetric physeal growth arrest post-trauma or infection.

Tibia Vara (Blount Disease):

• A progressive developmental disorder characterized by disturbed endochondral ossification of the posteromedial aspect of the proximal tibial physis, resulting in multiplanar varus, procurvatum, and internal rotation deformity of the tibia.

Differentiating Tibia Vara from Physiological Bowing:

• Clinical course: Physiological bowing is symmetrical, self-correcting by 2–3 years of age; Blount disease is progressive, often asymmetrical/unilateral, and worsens after age 2.
• Metaphyseal-Diaphyseal (Levine-Drennan) Angle:
  • Physiological bowing: $<{11}^{\circ }$
  • Tibia vara: $>{11}^{\circ }$ (often $>{16}^{\circ }$).
• Radiographic features: Blount disease shows medial proximal tibial beaking, sloping/depression, and fragmentation of the medial metaphysis and epiphysis (Langenskiöld staging); physiological bowing shows smooth, generalized bowing of femur and tibia without localized focal metaphyseal beaking.
• Lateral knee thrust: Present during walking in Blount disease; absent in physiological bowing.

Identification:

• Genu Valgum (Knock-Knees).

Definition & Normal Threshold:

• Deformity where knees touch each other while the medial malleoli of the ankles remain separated when standing with patellae facing directly forward.
• Quantified by measuring the Intermalleolar Distance (IMD).
• Physiological valgus peaks at 3–4 years of age (normal IMD up to $5\text{–}8\text{ cm}$) and resolves spontaneously to adult alignment by 7–8 years of age (normal adult $\text{IMD}<2\text{ cm}$). Pathological if $\text{IMD}>8\text{–}10\text{ cm}$ or persists after 8 years.

Common Causes:

• Physiological genu valgum (resolves by 7 years)
• Nutritional Rickets / Renal Osteodystrophy
• Skeletal dysplasias (e.g. Spondyloepiphyseal dysplasia, Morquio syndrome)
• Post-traumatic asymmetric lateral tibial growth stimulation (Cozen's phenomenon)
• Obesity / mechanical overload.

Indications for Surgical Correction (Hemiepiphysiodesis / Guided Growth with 8-plates or Osteotomy):

• Intermalleolar distance $>10\text{–}15\text{ cm}$
• Persistent deformity beyond $7\text{–}8\text{ years}$ of age
• Significant knee pain, gait instability, patellofemoral subluxation, or functional limitation
• Underlying metabolic bone disease or skeletal dysplasia causing progressive mechanical axis deviation.

Diagnosis:

• Osgood-Schlatter Disease (Traction Apophysitis of the Tibial Tuberosity).
• X-ray demonstrates soft tissue swelling, prominence, irregularity, and fragmentation of the tibial tubercle apophysis at the insertion of the patellar tendon.

Prognosis:

• Excellent; benign, self-limiting condition that resolves completely once skeletal maturity and physeal closure of the tibial tuberosity are reached (typically by 15–17 years of age).

Advice and Management:

• Activity modification: Relative rest; temporary avoidance of vigorous jumping, running, and kneeling sports that provoke pain.
• Cryotherapy: Ice application for 15–20 minutes after physical exertion.
• Analgesics: Short course of oral NSAIDs (Ibuprofen) during acute painful episodes.
• Physical therapy: Quadriceps and hamstring stretching and eccentric strengthening exercises.
• Infrapatellar / Patellar tendon strap: Decreases traction stress on the tibial tuberosity.
• Knee immobilizer / cast is rarely indicated (only for severe, refractory, acute disabling pain).

Tests & Clinical Purpose:

• Test A: Barlow Test (Provocative dislocation test: Hip is flexed to 90° and adducted with gentle posterior pressure applied along the femoral shaft $\to$ dislocates an unstable femoral head over the posterior acetabular rim with a palpable "jerk of exit").
• Test B: Ortolani Test (Reduction test: Dislocated hip is flexed to 90° and gently abducted while lifting the greater trochanter anteriorly $\to$ reduces the femoral head back into the acetabular cup with a palpable "clunk of entry").
• Purpose: Neonatal screening and diagnosis of Developmental Dysplasia of the Hip (DDH).

Incidence & Gender:

• Incidence: 1 to 1.5 per 1,000 live births.
• Females are 4 to 8 times more commonly affected than males (due to higher sensitivity to maternal relaxin hormone).

Investigation of Choice:

• Age $<6$ months: Dynamic Ultrasonography of the Hip (Graf method) (femoral head is largely cartilaginous and radiolucent on plain X-rays).
• Age $>6$ months: Plain Anteroposterior Pelvis X-ray (assesses Acetabular Index, Shenton's line, Perkins line, and Hilgenreiner line).

Treatment according to age:

• 0 to 6 months: Dynamic splinting with Pavlik Harness (maintains hips flexed $>90\text{–}{100}^{\circ }$ and abducted $45\text{–}{60}^{\circ }$).
• 6 months to 18–24 months: Closed reduction under general anesthesia with hip spica cast immobilization (open reduction if closed reduction fails).
• $>2$ years: Open reduction with pelvic (Salter/Pemberton) and femoral shortening/derotation osteotomy.

Orthosis Name:

• Pavlik Harness.

Diagnosis:

• Legg-Calvé-Perthes Disease (LCPD / Coxa Plana) (Idiopathic avascular osteonecrosis of the capital femoral epiphysis).
• X-ray demonstrates increased radiodensity/sclerosis, subchondral fracture line (Crescent sign), fragmentation, and flattening of the capital femoral epiphysis on the affected hip.

Pathophysiology:

• Temporary idiopathic disruption/ischemia of the blood supply (lateral epiphyseal artery branch of medial circumflex femoral artery) to the growing capital femoral epiphysis $\to$ infarction/necrosis of bone and marrow $\to$ subchondral fracture and bone resorption during weight-bearing $\to$ collapse and flattening of the femoral head (coxa plana) $\to$ revascularization, re-ossification, and remodeling.

Treatment:

• Goal: Relieve pain, preserve hip range of motion, and maintain "containment" of the femoral head within the acetabulum to ensure spherical remodeling.
• Non-operative: Temporary non-weight-bearing/bed rest, oral NSAIDs, physical therapy for maintaining abduction/internal rotation, abduction containment bracing (e.g. Scottish-Rite brace).
• Operative (for severe involvement / lateral extrusion / age $>6\text{–}8$ years): Containment surgery (Femoral varus derotation osteotomy or Salter innominate pelvic osteotomy).

Diagnosis:

• Slipped Capital Femoral Epiphysis (SCFE / SUFE - Slipped Upper Femoral Epiphysis).
• X-ray shows postero-inferior displacement of the capital femoral epiphysis relative to the femoral neck (Trethowan's sign / Klein's line does not intersect the lateral epiphysis).

Underlying Pathology:

• Salter-Harris Type I physeal fracture through the hypertrophic zone of the proximal femoral growth plate, where excessive mechanical shear forces (due to adolescent growth spurt and obesity) overwhelm the weakened physis, causing the femoral neck to displace anteriorly, superiorly, and externally rotate relative to the femoral head.

Treatment:

• Strict non-weight bearing / emergency bed rest (avoid ambulation or manipulative reduction to prevent avascular necrosis).
• Urgent surgical stabilization: In situ percutaneous single cannulated screw fixation across the physis into the center of the femoral head.

Diagnosis:

• Klippel-Feil Syndrome (Congenital Brevicollis).

Classic Clinical Triad & Radiological Feature:

• Clinical Triad:
  1. Short neck ("webbed" appearance)
  2. Low posterior hairline
  3. Limitation/restriction of cervical spine mobility.
• Radiological Feature: Congenital failure of normal vertebral segmentation resulting in congenital fusion of $\ge 2$ cervical vertebrae (most commonly C2–C3 or C5–C6), with potential hypermobility and instability at adjacent unfused motion segments.

Associated Anomalies & Syndromes:

• Sprengel's deformity (congenital elevation and hypoplasia of the scapula in 30% of cases)
• Scoliosis and kyphosis (in 60%)
• Congenital sensorineural or conductive hearing loss (in 30%)
• Genitourinary anomalies (unilateral renal agenesis)
• Congenital heart defects (VSD, PDA, Coarctation of Aorta)
• Associated syndromes: Goldenhar syndrome, VACTERL association.

Cause of limping:

• Slipped Capital Femoral Epiphysis (SCFE / SUFE) occurring secondary to Severe Primary Juvenile Hypothyroidism (Hashimoto's Thyroiditis).

X-ray findings & Best View:

• Findings: Widening, blurring, and irregularity of the left proximal femoral physis with medial and posterior displacement of the femoral epiphysis relative to the femoral neck (positive Trethowan's sign).
• Best View: Frog-leg lateral (Lauenstein) view of the pelvis/hip (most sensitive view for detecting early posterior displacement of the epiphysis).

Associated Endocrinopathies / Metabolic Conditions:

• Primary Hypothyroidism
• Growth Hormone (GH) deficiency or Growth Hormone replacement therapy
• Hypogonadism / Panhypopituitarism
• Renal Osteodystrophy / Secondary Hyperparathyroidism
• Hypercortisolemia (Cushing's syndrome).

Cause of Short Stature & Treatment:

• Cause: Chronic severe untreated Juvenile Hypothyroidism, leading to profound impairment of endochondral ossification, delayed skeletal maturation (bone age retardation), and growth arrest.
• Treatment:
  • Orthopedic management: Immediate non-weight-bearing and urgent in situ percutaneous cannulated screw fixation of the slipped capital femoral epiphysis.
  • Endocrine management: Oral Levothyroxine (L-thyroxine) replacement therapy (starting dose $2\text{–}3\mu \text{g/kg/day}$, titrating according to serum TSH and free T4 levels).

Deformity:

• Scoliosis (lateral spinal curvature with a Cobb angle $>{10}^{\circ }$ measured on standing whole-spine PA radiograph, accompanied by vertebral rotation).

Anthropometrical / Physical Parameter:

• True and Apparent Leg Length Discrepancy (LLD) (Pelvic obliquity from limb length inequality causes functional/non-structural scoliosis that resolves with an appropriate shoe raise).
• Also evaluate the Adam's Forward Bend Test with a scoliometer to measure the Angle of Trunk Rotation (ATR).

Types & Most Common:

• Non-structural (Functional) Scoliosis: Reversible, non-progressive curve without vertebral rotation (e.g. secondary to postural habit, muscle spasm, or leg length discrepancy).
• Structural Scoliosis: Fixed curvature with rotational deformity:
  • Adolescent Idiopathic Scoliosis (AIS) — most common type ($>80\mathrm{\%}$ of all structural scoliosis, commonly females 10–16 years).
  • Congenital Scoliosis (hemivertebrae, block vertebrae, unsegmented bars).
  • Neuromuscular Scoliosis (Cerebral Palsy, Duchenne Muscular Dystrophy, SMA).
  • Syndromic Scoliosis (Marfan syndrome, NF-1).

Treatment Options & Early Surgery Indications:

• Treatment Options (based on Cobb Angle & Skeletal Maturity / Risser stage):
  • Cobb angle $<20\text{–}{25}^{\circ }$: Observation and serial clinical/radiographic monitoring every 6 months.
  • Cobb angle $25\text{–}{40}^{\circ }$ in growing child: Bracing using a rigid Thoracolumbosacral Orthosis (TLSO / Boston brace) worn 18–23 hours/day.
  • Cobb angle $>45\text{–}{50}^{\circ }$: Posterior spinal fusion with segmental instrumentation.
• Indications for Early Surgical Treatment:
  • Duchenne Muscular Dystrophy (DMD) (early progressive neuromuscular curve with loss of sitting balance and impending pulmonary compromise).
  • Congenital Scoliosis with unilateral unsegmented bar and contralateral hemivertebra (malignant, rapidly progressive curve refractory to bracing).

Possible diagnosis:

• Hereditary Multiple Exostoses (HME / Hereditary Multiple Osteochondromas / Diaphyseal Aclasis) (Autosomal dominant disorder due to mutations in EXT1 or EXT2 genes).

Clinical Manifestations & Complications:

• Multiple painless, hard, bony juxta-epiphyseal projections (osteochondromas) capped with cartilage, predominantly at the metaphyses of long bones (distal femur, proximal tibia/fibula, proximal humerus).
• Angular limb deformities (genu valgum, ankle valgus), ulnar shortening with radial bowing (Madelung-like deformity), and limb length discrepancy.
• Local compression of adjacent nerves (peroneal, sciatic), blood vessels, and tendons causing pain, bursitis, and paresthesias.
• Malignant transformation: Risk of secondary Chondrosarcoma in adulthood (~1–5%), characterized by sudden rapid enlargement, new pain, or cartilage cap thickness $>1.5\text{–}2.0\text{ cm}$ on MRI.

Treatment Options:

• Observation: Asymptomatic osteochondromas require periodic clinical and radiographic monitoring.
• Surgical Excision (Exostosectomy): Indicated for lesions causing severe pain, mechanical limitation of joint movement, vascular or nerve entrapment, progressive cosmetic/angular deformity, or suspicion of malignant transformation. Care is taken to protect adjacent growth plates in skeletally immature children.
• Corrective osteotomies and epiphysiodesis for limb length discrepancies and angular deformities.