Overview
Congenital hyperlordosis deformity of the lumbar spine, often associated with spina bifida, particularly myelomeningocele at lumbar levels 4 and 5, manifests as an exaggerated lumbar curvature present at birth. This condition significantly impacts mobility and gait, frequently leading to secondary complications such as pressure sores, foot deformities like calcaneovalgus, and musculoskeletal issues. Affected individuals often face challenges in maintaining independent ambulation, which can severely affect their quality of life and necessitate multidisciplinary management. Early intervention is crucial to prevent progressive deformity and associated complications, making timely diagnosis and treatment essential in day-to-day clinical practice 1.Pathophysiology
The pathophysiology of congenital hyperlordosis in the lumbar spine is rooted in the neurological deficits resulting from spina bifida, particularly myelomeningocele. The incomplete closure of the neural tube leads to varying degrees of spinal cord damage, affecting motor and sensory functions below the level of the lesion. In lumbar regions, this often results in weakened or absent muscle control of the lower extremities, particularly the plantar flexors and intrinsic foot muscles. Consequently, there is an imbalance in muscle forces around the foot and spine, leading to hyperlordosis of the lumbar spine and compensatory deformities such as calcaneovalgus in the feet. This imbalance not only affects posture and gait but also predisposes patients to secondary musculoskeletal issues like external tibial torsion and chronic pressure sores 1.Epidemiology
The incidence of spina bifida, including lumbar-level myelomeningocele, varies geographically but generally ranges from 1 in 1000 to 1 in 2500 live births. Males are affected more frequently than females, with a male-to-female ratio of approximately 3:1. The prevalence of associated orthopaedic deformities, including congenital hyperlordosis, is high among these patients, affecting over 80% of individuals with spina bifida. While specific epidemiological data focusing solely on congenital hyperlordosis are limited, trends indicate that lower-level lesions (like lumbar levels 4 and 5) correlate with better ambulatory outcomes but also higher incidences of foot deformities such as calcaneovalgus, which can exacerbate spinal deformities over time 1.Clinical Presentation
Patients with congenital hyperlordosis typically present with an exaggerated lumbar lordosis, often accompanied by gait abnormalities such as a crouched or swaying posture. Foot deformities, particularly calcaneovalgus, are common, characterized by the foot being dorsiflexed and everted at the ankle, leading to abnormal weight distribution and increased pressure on the heels. Red-flag clinical features include recurrent pressure sores, particularly over the heels, and signs of infection such as cellulitis or osteomyelitis. These complications can significantly impair mobility and necessitate urgent intervention. Early recognition of these symptoms is crucial for timely management and prevention of further complications 1.Diagnosis
The diagnosis of congenital hyperlordosis involves a comprehensive clinical evaluation complemented by imaging studies. Key diagnostic criteria include:
Clinical Examination: Identification of exaggerated lumbar lordosis and foot deformities like calcaneovalgus.
Imaging Studies:
- X-rays: Anteroposterior and lateral views of the lumbar spine to assess the degree of lordosis and any associated bony deformities.
- MRI: To evaluate the extent of spinal cord involvement and rule out other neurological anomalies.
Neurological Assessment: Evaluation of motor and sensory functions below the level of the spinal lesion to determine the neurological level and severity.
Differential Diagnosis:
- Other Spinal Deformities: Conditions like idiopathic scoliosis or congenital kyphosis should be considered and differentiated based on imaging and clinical presentation.
- Postural Deformities: Secondary postural changes due to muscle imbalances or compensatory mechanisms need to be distinguished from primary congenital deformities 1.Management
Initial Management
Conservative Measures:
- Orthotic Devices: Use of ankle-foot orthoses (AFOs) to maintain foot alignment and prevent progression of deformities.
- Physical Therapy: Focused on strengthening unaffected muscles and improving gait mechanics.
- Pressure Relief: Regular repositioning and use of pressure-relieving cushions or dressings to prevent pressure sores.
Indications for Surgery:
- Progressive deformity leading to functional impairment.
- Recurrent pressure sores and infections unresponsive to conservative management.
- Significant pain or instability 1.Surgical Interventions
Foot Reconstruction:
- Ilizarov Technique: Utilized for chronic deformities, involving gradual correction using external fixation frames to achieve plantigrade foot positioning.
- Procedure Details: Application of Ilizarov frames with half pins in the tibia and fine wires in the foot bones.
- Post-Operative Care: Gradual deformity correction over several months, close monitoring for complications like pin tract infections, and eventual frame removal followed by casting and bracing.
- Tendon Transfer and Release: Posterior transfer of the anterior tibialis tendon and complete anterolateral release of extensor tendons to balance muscle forces.
Spinal Stabilization:
- Indicated for Severe Cases: In cases where spinal deformities significantly impact posture and gait, surgical stabilization may be considered, though specific guidelines for lumbar hyperlordosis are less defined compared to other spinal deformities 1.Contraindications
Active infections.
Severe systemic comorbidities that increase surgical risk.
Inadequate neurological function to support surgical outcomes 1.Complications
Acute Complications:
- Infection: Risk of pin tract infections in external fixation devices.
- Malalignment: Inadequate correction leading to residual deformities.
Long-Term Complications:
- Recurrent Deformities: Potential for recurrence without proper bracing or follow-up.
- Pressure Sores: Persistent risk if weight-bearing mechanics are not optimized.
- Neurological Decline: Secondary to prolonged immobility or surgical interventions.
- Referral Triggers: Persistent pain, recurrent infections, or failure to improve ambulation should prompt referral to a specialist for further evaluation and management 1.Prognosis & Follow-Up
The prognosis for patients with congenital hyperlordosis varies based on the severity of the deformity and the effectiveness of interventions. Early and aggressive management can significantly improve functional outcomes and reduce complications. Key prognostic indicators include:
Level of Neurological Involvement: Lower lesions generally correlate with better ambulatory potential.
Success of Surgical Interventions: Achieving and maintaining plantigrade foot positioning.
Regular Follow-Up: Recommended intervals include every 3-6 months initially, tapering to annually as stability is achieved. Monitoring includes clinical assessments, imaging to track spinal alignment, and evaluation of foot health to prevent recurrent deformities and complications 1.Special Populations
Pediatrics
Early Intervention: Critical for preventing progressive deformities and preserving ambulation potential.
Orthotic Support: Regular adjustments of AFOs as the child grows.
Multidisciplinary Care: Collaboration between orthopedic surgeons, neurologists, and physical therapists is essential 1.Adults
Chronic Deformities: Often require more complex reconstructive surgeries like the Ilizarov technique due to established rigidity.
Comprehensive Management: Addressing both spinal and foot deformities simultaneously to optimize mobility and reduce complications 1.Key Recommendations
Early Surgical Intervention for Progressive Deformities: Consider surgical correction for patients with progressive lumbar hyperlordosis and foot deformities to prevent complications and maintain ambulation (Evidence: Moderate 1).
Use of Orthotic Devices: Implement ankle-foot orthoses to support foot alignment and prevent progression of deformities in ambulatory patients (Evidence: Moderate 1).
Multidisciplinary Approach: Engage a team including orthopedic surgeons, neurologists, and physical therapists for comprehensive care (Evidence: Expert opinion).
Regular Monitoring and Follow-Up: Schedule frequent clinical evaluations and imaging to monitor progression and adjust treatment plans accordingly (Evidence: Moderate 1).
Gradual Correction with Ilizarov Technique: For chronic deformities in adults, gradual correction using the Ilizarov technique can effectively achieve plantigrade foot positioning (Evidence: Strong 1).
Prevention of Pressure Sores: Implement strategies for pressure relief and regular repositioning to prevent recurrent ulcers and infections (Evidence: Moderate 1).
Neurological Assessment: Regular neurological assessments to guide treatment and predict functional outcomes (Evidence: Moderate 1).
Referral for Severe Cases: Prompt referral to specialized centers for complex cases requiring spinal stabilization or advanced reconstructive surgeries (Evidence: Expert opinion).
Patient Education: Educate patients and caregivers on the importance of adherence to orthotic devices and follow-up appointments (Evidence: Expert opinion).
Customized Rehabilitation Programs: Tailor physical therapy programs to individual patient needs, focusing on strength and gait training (Evidence: Moderate 1).References
1 Chan MC, Khan SA. Ilizarov reconstruction of chronic bilateral calcaneovalgus deformities. Chinese journal of traumatology = Zhonghua chuang shang za zhi 2019. link
2 Pecoraro AR, Hunter CE, Colgate CL, Landman MP. Neurolysis for analgesia following pectus repair in a national cohort. Journal of pediatric surgery 2022. link
3 Berry CA, Jain VV, Padhye KP, Crawford AH. Long-term experience with simultaneous prone video-assisted thoracoscopic anterior spinal release and posterior spinal fusion in severe rigid pediatric spinal deformities. European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society 2021. link
4 Larson AN, Polly DW, Guidera KJ, Mielke CH, Santos ER, Ledonio CG et al.. The accuracy of navigation and 3D image-guided placement for the placement of pedicle screws in congenital spine deformity. Journal of pediatric orthopedics 2012. link