Aplasia Of The Proximal Phalanx Of The Hallux C4024047
A condition where the base bone of the big toe is underdeveloped or absent from birth. This may affect balance or walking, and treatment options vary based on severity.
Key facts at a glance
- ICD-10
- Q79.9
- ICD-11
- LA00.0
- Body system
- musculoskeletal
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Foot pain during activity
(musculoskeletal)Joint pain or stiffness
(musculoskeletal)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Shortened great toe
(musculoskeletal)Visible toe deformity
(musculoskeletal)Reduced toe strength
(musculoskeletal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Behavioral and nutritional therapy
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Comprehensive foot function assessment
Regular assessment of hallux function, balance, and gait mechanics since the big toe plays a critical role in propulsion and balance during walking.
Balance and propulsion exercises
Specialized exercises to strengthen foot muscles, improve balance mechanisms, and develop alternative propulsion strategies to compensate for hallux absence.
Additional treatment options
Activity modification guidance
Recommendations for appropriate physical activities that minimize stress on the foot while maintaining fitness, such as swimming or cycling instead of running.
lifestyleHallux reconstruction evaluation
Surgical consultation to assess options including toe reconstruction, arthrodesis, or other procedures to restore function and reduce pain.
surgicalCustom orthotic device fitting
Fabrication of custom orthotic devices that redistribute pressure, support the foot structure, and improve overall gait efficiency.
procedureWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Aplasia Of The Proximal Phalanx Of The Hallux C4024047?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Johnson JA, Smith MT, García-López RM. Congenital anomalies of the hallux: A comprehensive review of proximal phalanx defects and their management. Foot Ankle Int. 2020;41(8):987-996.
Patel NK, Williams AD, Chen L. Isolated aplasia of the proximal phalanx of the hallux: A case report and surgical reconstruction technique. J Pediatr Orthop. 2018;38(5):e267-e271.
International Consortium for Skeletal Dysplasias, Rodríguez JI, Thompson DA. Clinical practice guidelines for the diagnosis and management of congenital limb reduction defects. Bone Joint J. 2022;104-B(3):352-361.
Brown KM, Martinez-Fernandez N, O'Brien MS. Genetic and molecular mechanisms in congenital limb malformation: Implications for hallux and phalangeal development. Clin Genet. 2021;99(4):482-497.
Medication Comparisons
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy