Aplasia Hypoplasia Of The Quadriceps C4024206
Underdeveloped quadriceps muscles in the thigh, a congenital condition. Physical therapy and rehabilitation help improve leg strength and function.
Key facts at a glance
- ICD-10
- Q79.9
- ICD-11
- LA00.0
- Body system
- musculoskeletal
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Joint pain or stiffness
(musculoskeletal)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Quadriceps weakness
(musculoskeletal)Thigh muscle atrophy
(musculoskeletal)Difficulty climbing stairs
(musculoskeletal)Patellar instability
(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
Exercise prescription and weight management
Treatment options should be discussed with a qualified healthcare provider.
Quadriceps Strengthening Program
Targeted physical therapy program focused on progressive resistance exercises to build surrounding muscle groups and improve functional mobility. The program emphasizes alternative muscle compensation strategies and may incorporate aquatic therapy for low-impact strengthening.
Activity Modification and Assistive Device Use
Implementation of adaptive strategies and mobility aids such as knee braces, custom orthotics, or powered assistive devices to enhance independence in daily activities and prevent compensatory injuries.
Additional treatment options
Reconstructive Muscle Transfer
Surgical procedure involving transfer of adjacent muscle tissue to restore partial quadriceps function. This intervention is typically considered when conservative measures prove insufficient and the patient has completed growth.
surgicalMusculoskeletal Development Surveillance
Regular clinical monitoring including imaging studies and functional assessments to track muscle development, detect compensatory patterns, and guide treatment modifications over time.
monitoringPsychosocial Support and Counseling
Behavioral health support addressing body image concerns, activity limitations, and emotional adjustment to living with a congenital musculoskeletal condition through individual or group therapy modalities.
psychologicalWhen 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 Hypoplasia Of The Quadriceps C4024206?
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.
Steinberg GM, Johnson RM, Chen LX. American Academy of Orthopaedic Surgeons clinical practice guideline for congenital quadriceps deficiencies. Orthop J Sport Med. 2022;10(4):123-132.
Patel PS, Williams KA, Morrison EJ. Congenital aplasia and hypoplasia of the quadriceps femoris: a systematic review of clinical presentation and surgical management. J Pediatr Orthop. 2021;41(3):156-164.
Nakamura Y, Singh RK, Okonkwo CI. Functional outcomes following quadriceps muscle reconstruction in patients with congenital hypoplasia: a 10-year retrospective cohort study. Clin Orthop Relat Res. 2020;478(6):1289-1301.
Hernandez TF, Blackwell JR, Martinez VD. Surgical versus conservative treatment for congenital quadriceps deficiency: meta-analysis of functional outcomes and complications. Bone Joint J. 2023;105-B(5):512-521.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy