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Distal arthrogryposis Type 1

Distal arthrogryposis Type 1




Overview

Distal arthrogryposis type 1 is a rare genetic condition that causes non-progressive joint contractures (stiffness and deformities) primarily restricting movement in the hands and feet. It typically does not affect intelligence or involve internal organs.

Symptoms

Hand and Finger Symptoms

Camptodactyly: Permanently bent or flexed fingers that cannot straighten completely.

Overlapping fingers: Fingers that cross over one another when the hands are at rest.

Ulnar deviation: A hand deformity where the fingers angle outward toward the pinky (fifth) finger.

Clasped thumbs: Thumbs pulled tightly across the palm.

Foot and Toe Symptoms

Clubfoot: Feet that turn inward and upward (talipes equinovarus).

Bent toes: Permanently flexed or overlapping toes similar to the finger deformities.

General Characteristics

Localized impact: Contractures are mostly limited to the distal limbs (hands, wrists, feet).

Normal intelligence: Cognitive development and intellect are typically unaffected.

No internal organ involvement: Visceral organs are usually not affected by the condition.

Causes

TPM2 Gene : Encodes beta-tropomyosin, an essential protein for muscle contraction regulation.

MYBPC1 Gene: Encodes the slow skeletal muscle binding protein-C.

TNNI2 and TNNT3 Genes: Encode fast-twitch skeletal muscle troponin components that can also harbor disease-causing variants.

Autosomal Dominant: A single altered copy of the mutated gene in each cell is enough to cause the condition.Familial History: Many affected individuals inherit the mutation from an impacted parent, though spontaneous (de novo) new mutations can also occur.

Diagnosis

To meet the clinical standard for diagnosis, an individual generally must show specific distal joint abnormalities:

Hand findings: Permanently bent fingers (camptodactyly), overlapping fingers, clenched fists, ulnar deviation of the fingers, and missing or small skin creases on the joints of the fingers.

Foot findings: Clubfoot (talipes equinovarus) or other vertical talus/foot positioning issues.

General health: Normal intelligence and a lack of major internal organ (visceral) involvement

Molecular analysis: Blood tests can pinpoint heterozygous mutations in genes encoding skeletal muscle sarcomeric proteins—most commonly TNNI2, TPM2, or MYBPC1.

Family history: DA1 follows an autosomal dominant inheritance pattern, meaning a parent with the gene has a 50% chance of passing it to a child. Genetic counseling is often recommended.

Ultrasound: Detailed fetal scans during pregnancy can sometimes detect reduced movement or visible joint contractures like clubfoot and clenched hands, particularly in the second trimester if there is a known family history.

Treatment

Physical Therapy (PT): Daily passive and active range-of-motion stretching exercises started in early infancy to improve joint flexibility.

Occupational Therapy (OT): Focuses on strengthening upper extremities and training children to use adaptive tools for self-feeding, writing, and daily tasks.

Splinting and Casting: Serial casting and custom orthotic splints applied sequentially to gradually correct hand, wrist, and foot contractures (such as clubfoot)

Soft-Tissue Releases: Performed when conservative stretching fails to correct rigid contractures, releasing tight tendons, ligaments, or joint capsules.Tendon 

Transfers or Tenotomies: Procedures like Achilles tenotomy for foot alignment or specialized tendon transfers to improve hand and finger grasp or elbow movement.

Osteotomies: Bone-cutting procedures reserved for severe, fixed angular deformities that impede functional positioning or walking.

Nighttime Bracing: Long-term use of dynamic or static braces, particularly during growth spurts, to prevent the recurrence of joint stiffness and contractures.

Adaptive Devices: Utilization of specialized wheelchairs, walkers, or modified utensils to support independent mobility and daily life.

Type of Doctor Department : A pediatric orthopedic surgeon and a pediatrician

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