Q74.1
Congenital malformation of knee
Clinical Classification Guidelines
Inclusion Terms
- Congenital absence of patella
- Congenital dislocation of patella
- Congenital genu valgum
- Congenital genu varum
- Rudimentary patella
Excludes Type 1
- congenital dislocation of knee (Q68.2)
- congenital genu recurvatum (Q68.2)
- nail patella syndrome (Q87.2)
Medical Intelligence & Overview
Congenital malformations of the knee are birth defects involving the knee joint's structure and alignment. These conditions affect how the knee functions and can vary from mild differences to more significant deformities. They include conditions such as the absence of the kneecap (patella), dislocation of the kneecap, as well as deformities like bow-leggedness (genu varum) and knock-knees (genu valgum). Recognizing these differences early is essential for appropriate management and treatment planning.
Causes & Symptoms
Clinical Causes: Genetic factors passed from parents to the child Family history of joint deformities or congenital conditions Environmental influences during pregnancy, such as exposure to certain medications or toxins Developmental issues in the womb affecting limb formation Syndromes associated with limb deformities Unknown factors, as in many congenital conditions
Key Symptoms: Visible deformity or abnormal shape of the knee at birth Difficulty in straightening or bending the knee Unequal leg lengths or misaligned limb positioning Limited mobility or leg stiffness Difficulty walking or bearing weight on the affected leg Pain or discomfort during movement (may develop later) Preference to avoid using the affected limb
Diagnostic & Treatment
Diagnosis Path: Diagnosis typically involves a thorough physical examination by a healthcare professional, assessing the shape, position, and mobility of the knee joint. Imaging studies such as X-rays are essential for confirming the presence and extent of malformations like absent patella, dislocation, or deformity. Sometimes, additional imaging modalities like MRI or ultrasound are used to evaluate soft tissue structures and associated abnormalities. Genetic counseling may be recommended if a syndromic cause is suspected.
Treatment Protocols: Surgical procedures to correct deformities, realign the joint, or address absent or rudimentary bones Physical therapy aimed at improving joint mobility, strength, and function Use of orthotic devices or braces to support joint stability and improve alignment Growth modulation techniques in children to guide limb development Long-term monitoring to assess joint function and prevent secondary complications Multidisciplinary care involving orthopedic surgeons, physiotherapists, and other specialists
Clinical Advice & FAQs
Billing Guidance
Is Q74.1 a billable ICD-10 code?
Yes, Q74.1 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report Q74.1?
Clinical documentation must specify the nature of Congenital malformation of knee and any associated comorbidities for accurate reporting.
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