Presenting History

When evaluating a male child with suspected Duchenne Muscular Dystrophy (DMD) or progressive proximal muscle weakness, obtain a meticulous chronological account of motor development, functional decline, and characteristic compensatory maneuvers.

Onset & Early Motor Milestones: Inquire about the age of independent walking (frequently delayed beyond 15–18 months in DMD). Ask if the parents noticed toe-walking, clumsy running, frequent tripping, or inability to keep up with peers from 2 to 4 years of age.
Proximal Muscle Weakness (Pelvic Girdle > Shoulder Girdle):
- Lower Limbs: Ask about difficulty getting up from a squatting position on the floor (needs to push on knees/thighs to stand up — Gowers' sign). Inquire about difficulty climbing stairs (needs railing or places two feet on each step).
- Gait Alteration: Inquire about progressive waddling gait (Trendelenburg gait due to gluteus medius weakness) and excessive inward curving of the lower back (exaggerated lumbar lordosis).
- Upper Limbs: Inquire about difficulty raising arms above the shoulder level, combing hair, or lifting school bags (shoulder girdle weakness emerging typically 2–3 years after pelvic girdle weakness).
Muscle Enlargement & Pseudohypertrophy: Inquire about prominent, bulky appearance of calf muscles (pseudohypertrophy of gastrocnemius/soleus), deltoids, or tongue, and whether the muscles feel abnormally firm, doughy, or rubbery rather than muscular.
Contractures & Skeletal Deformities: Inquire about progressive tightness around ankles (equinus deformity/Achilles tendon tightness), knees, or spine deviation (scoliosis).

Negative History (3C 1D Framework)

Category	Pertinent Negative Question	Rationale / Significance
Causes (Etiology)	History of similar progressive weakness or early death in male maternal relatives (uncles, cousins)?	DMD is an X-linked recessive disorder; ~65–70% of cases are inherited from carrier mothers, while ~30–35% represent spontaneous new mutations (Haldane's principle).
Causes	History of steroid intake, statins, or traditional native medications?	Rules out exogenous steroid-induced proximal myopathy or drug-induced myopathy.
Complaints (Bulbar/Ocular)	History of drooping eyelids (ptosis), double vision (diplopia), nasal twang, or swallowing difficulty?	Critical negative: Extraocular muscles and bulbar muscles are strictly spared in DMD; their involvement strongly points to Myasthenia Gravis, Mitochondrial Myopathy, or Oculopharyngeal Dystrophy.
Complaints (Sensory/Bladder)	History of sensory loss, tingling, numbness, or bowel and bladder incontinence?	Differentiates primary muscle disease (myopathy) from Spinal Muscular Atrophy (SMA), peripheral neuropathy (GBS), or compressive myelopathy where neural structures/sphincters are involved.
Complications (Cardiopulmonary)	History of breathlessness on exertion, nocturnal awakening, orthopnea, or frequent chest infections?	Detects progressive Dilated Cardiomyopathy (DCM, present in ~90% of DMD >14 years) and restrictive pulmonary insufficiency due to diaphragm and intercostal muscle weakness.
Differentials (Mimics)	History of prominent muscle pain, tenderness, purple rash around eyes (heliotrope), or joint pains?	Rules out Juvenile Dermatomyositis (JDM) or Polymyositis.
Differentials	History of severe muscle cramps, dark tea-colored urine after strenuous exercise, or second-wind phenomenon?	Suggests Glycogen Storage Diseases (McArdle disease / GSD V) or Mitochondrial Myopathies rather than DMD.
Differentials	History of constipation, prolonged neonatal jaundice, dry coarse skin, or coarse facial features?	Rules out Congenital / Juvenile Hypothyroidism (Hoffman syndrome: pseudohypertrophy with hypothyroidism).

Other Relevant History

Antenatal & Birth History: Maternal age, uneventful pregnancy, gestational age, birth weight, and neonatal course (neonatal hypotonia is usually absent or very mild in DMD, differentiating it from congenital myopathies/SMA).
Developmental History: Detailed assessment across Gross motor, Fine motor, Language, and Social domains. Look for global motor delay and isolated speech delay / cognitive impairment (dystrophin isoform Dp140/Dp71 is expressed in the cerebral cortex and cerebellum; ~30% of DMD patients have mild intellectual disability or Autism Spectrum Disorder).
Family Pedigree: Construct an exhaustive 3-generation pedigree chart tracing maternal line males. Inquire about carrier mother symptoms (mild calf cramping or elevated serum CK).
Treatment & Steroid History: Detailed record of corticosteroid therapy (Deflazacort vs Prednisolone dose, duration, side effects like weight gain/cushingoid facies/cataracts), calcium/vitamin D supplementation, and nighttime non-invasive ventilation (NIV/BiPAP).

History Summary

Spoken Formulation: History Summary

"I would like to summarize the history of this Age in years old male child, Birth Order order child born to a Consanguineous / Non-consanguineous couple from Geographic Area, with a family history suggestive of X-linked recessive inheritance / Negative family history, who presented with insidious onset, slowly progressive, symmetrical proximal muscle weakness starting in the pelvic girdle muscles from Age of onset, e.g., 3 years, characterized by difficulty in getting up from the floor, waddling gait, frequent falls, and calf enlargement, with later involvement of shoulder girdle muscles, with preserved bladder, bowel, sensory, ocular, and bulbar functions.

In view of the early childhood onset, progressive proximal-to-distal weakness pattern, pseudohypertrophy of calves, positive Gowers' sign, and absence of sensory or cranial nerve involvement, I would like to consider a clinical diagnosis of a Primary Muscle Disorder / Progressive Muscular Dystrophy, most probably Duchenne Muscular Dystrophy (DMD), in the Ambulatory / Early Non-Ambulatory / Late Non-Ambulatory stage, with Preserved / Impaired cardiopulmonary functional status."

General & Head-to-Toe Examination

Pre-Examination Child Behavioral State

Child State: Child is alert, cooperative, cheerful, able to follow commands (Prechtl State 3 / Active cooperative).

Vitals & Anthropometry

Heart Rate: Look for resting sinus tachycardia (early sign of dystrophin-deficient cardiomyopathy) or arrhythmias.
Respiratory Rate: Baseline rate and chest expansion; look for paradoxical abdominal breathing (diaphragmatic weakness).
Blood Pressure & Anthropometry: Measure height/length (or arm span in contractures), weight, and BMI. Assess for steroid-induced obesity or linear growth deceleration.

Head-to-Toe Inspection

Facies & Cranium: Alert facies; no myopathic hatchet-face or facial weakness; normal temporalis and masseter bulk.
Spine & Posture: Inspect standing posture from the side:
- Exaggerated Lumbar Lordosis: Prominent anterior pelvic tilt with protuberant abdomen to keep the center of gravity behind the hip joints (compensating for gluteus maximus weakness).
- Scoliosis: Look for thoracolumbar curve in older/wheelchair-bound children.
Specific Muscle Pseudohypertrophy & Atrophy:
- Pseudohypertrophic Muscles: Calf muscles (Gastrocnemius & Soleus) appear disproportionately large and bulky with a rubbery, firm, non-tender consistency (fibrofatty replacement); Deltoids, Infraspinatus, and Tongue may also show hypertrophy.
- Atrophic Muscles: Pectoralis major (sternal head), latissimus dorsi, biceps, quadriceps, and pelvic gluteal muscles.
Contractures: Assess passive range of motion at ankles (Achilles tendon / equinus contracture), knees (iliotibial band / hamstring contractures), and hips (Thomas test for hip flexion contracture).

Systemic Examination: Motor & Nervous System

1. Higher Mental Functions & Cranial Nerves

HMF: Age-appropriate intelligence; screen for associated speech delay or ADHD traits.
Cranial Nerves: All cranial nerves CN I to XII are strictly normal. Eye movements, facial power, jaw strength, palate elevation, and tongue movements are completely preserved.

2. Motor System (Granular Assessment)

Motor Parameter	Upper Limbs	Lower Limbs
Muscle Bulk	Deltoid hypertrophy; wasting of sternal head of Pectoralis Major and Biceps.	Marked pseudohypertrophy of calves; wasting of Quadriceps and Glutei.
Tone	Normal or mild hypotonia at shoulders.	Normal resting tone; tightness/pseudohypertonia at Achilles tendon.
Power Distribution	Proximal > Distal Weakness • Shoulder Abduction (Deltoid): 3/5 • Elbow Flexion (Biceps): 3/5 • Wrist Flexors/Extensors: 4+/5 • Hand Grip: 5/5 (Preserved)	Proximal > Distal Weakness • Hip Flexors (Iliopsoas): 2/5 • Hip Extensors (Gluteus Max): 2/5 • Knee Extensors (Quadriceps): 3/5 • Ankle Dorsiflexors: 4/5

3. Pathognomonic Clinical Maneuvers

Gowers' Sign: Ask the child to sit on the floor and then stand up without holding furniture:
- Child turns prone $\rightarrow$ assumes four-point kneeling posture $\rightarrow$ extends knees $\rightarrow$ places hands on knees and "climbs up his own thighs" using upper limb strength to extend the hips.
Waddling Gait (Trendelenburg Gait): Child walks with wide base, tilting the trunk from side to side to clear the swinging leg due to bilateral gluteus medius weakness.
Valley Sign: Bilateral hypertrophy of infraspinatus and deltoids with severe wasting of anterior axillary folds (pectoralis major) and periscapular muscles produces a characteristic visible "valley" (depression) in the axilla on arm abduction.
Scapular Winging & Slipping Through the Axillae: On attempting vertical suspension from the axillae, the examiner's hands slide upward due to severe shoulder girdle (serratus anterior/trapezius) weakness.

4. Reflexes & Sensory System

Deep Tendon Reflexes (DTRs):
- Knee jerks: Diminished or absent early (due to early quadriceps wasting).
- Ankle jerks: Characteristically preserved until very late (in late non-ambulatory stage), a classic diagnostic hallmark of DMD.
- Biceps & Triceps jerks: Sluggish or absent.
Superficial Reflexes: Abdominal reflexes present; Plantar response is flexor bilaterally (down-going).
Sensory System: Intact light touch, pain, temperature, vibration, and joint position sense.
Cerebellar Signs: No nystagmus, dysmetria, intention tremor, or ataxia.

Final Summary & Diagnosis

Spoken Formulation: Final Presentation

"On examination of this Age in years old male child who is active, cooperative, and comfortable, physical examination reveals exaggerated lumbar lordosis, wide-based waddling gait, positive Gowers' sign, bilateral symmetric pseudohypertrophy of the calf muscles (firm and rubbery in consistency), symmetrical proximal muscle weakness (lower limbs > upper limbs, power grade 2–3/5 proximally vs 4–5/5 distally), with absent knee jerks but characteristically preserved ankle jerks, intact sensory modalities, normal cranial nerves, and no pyramidal tract signs.

Final Diagnosis: I formulate my diagnosis as a case of Primary Muscle Disease (Myopathy), clinically consistent with Duchenne Muscular Dystrophy (DMD), currently in the Ambulatory Stage (Vignos Scale Grade 1 / 2 / 3), with No / Early Achilles tendon contractures, and No overt clinical evidence of cardiomyopathy or respiratory insufficiency."

Vignos Functional Rating Scale for Lower Extremities in DMD

Grade	Clinical Description
Grade 1	Walks and climbs stairs without assistance.
Grade 2	Walks and climbs stairs with aid of handrail.
Grade 3	Walks and climbs stairs slowly with aid of handrail (>25 seconds for 8 steps).
Grade 4	Walks unassisted and rises from chair, but cannot climb stairs.
Grade 5	Walks unassisted, but cannot rise from chair or climb stairs.
Grade 6	Walks only with assistance or walks with long leg braces.
Grade 7	In wheelchair; sits erect and rolls wheelchair independently.
Grade 8	In wheelchair; needs back support for sitting upright.
Grade 9	In bed; unable to perform activities of daily living without assistance.