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Infection of vertebral internal fixation device — Clinical Guidelines

Overview

Vertebral infections, encompassing vertebral osteomyelitis, septic physitis, and discospondylitis, represent serious conditions characterized by inflammation and infection within the vertebral column. These infections can significantly impact mobility and neurological function, particularly when internal fixation devices are involved. While commonly reported in species like dogs, horses, and cattle, vertebral infections in goats are rare and often identified posthumously. In clinical practice, early recognition and appropriate management are crucial to prevent long-term complications such as spinal deformities, chronic pain, and neurological deficits. Prompt diagnosis and tailored antibiotic therapy are essential for favorable outcomes, especially in animals with implanted internal fixation devices.

Pathophysiology

Vertebral infections typically originate hematogenously, with bacteria seeding the vertebral endplates via the bloodstream and subsequently spreading to adjacent structures like intervertebral discs and adjacent vertebrae. The initial infection targets the nutrient-rich vertebral endplates, often in slowly flowing venous channels, leading to bone lysis and subsequent periosteal reaction characterized by sclerosis and reactive bone formation. In cases involving internal fixation devices, these implants can serve as foci for persistent infection or impede proper healing, complicating the natural progression of the disease. The spread of infection can be facilitated by the complex venous plexus surrounding the vertebrae, potentially leading to multifocal involvement and systemic complications if left untreated. 1 2 3

Epidemiology

Vertebral infections are relatively uncommon in goats, with most reported cases being limited to necropsy findings, indicating a scarcity of clinical data. In other species, the incidence varies but tends to peak in older animals or those with predisposing factors such as immunosuppression, trauma, or surgical interventions. While specific incidence rates for goats are not provided, similar trends suggest that geriatric goats or those with concurrent health issues may be at higher risk. Geographic distribution and seasonal variations are less documented in goats compared to more frequently affected species, but environmental factors and herd management practices likely play roles in disease prevalence. 1 7

Clinical Presentation

Clinical signs of vertebral infections in goats often include nonspecific symptoms such as lethargy, anorexia, weight loss, and intermittent or persistent pain, which can manifest as lameness or stiffness. Neurological deficits may become apparent with advancing disease, including ataxia, paresis, or paralysis, particularly if the infection involves the spinal cord. Red-flag features include fever, localized swelling, and signs of systemic illness, which warrant immediate diagnostic evaluation. In goats with internal fixation devices, additional symptoms might include device-related complications such as migration or infection around the implant site. 1 7

Diagnosis

The diagnosis of vertebral infections in goats typically relies on a combination of clinical signs, imaging studies, and laboratory tests. Diagnostic Approach:

Clinical Evaluation: Detailed history and physical examination focusing on neurological status and musculoskeletal findings.

Imaging: Computed tomography (CT) is particularly valuable, revealing characteristic features such as multifocal bone lysis, sclerosis, and periosteal reactions. Magnetic resonance imaging (MRI) can further delineate soft tissue involvement and disc changes.

Laboratory Tests: Elevated white blood cell counts, inflammatory markers, and specific serology (e.g., Brucella canis) may support the diagnosis. Cultures from blood, cerebrospinal fluid (CSF), and tissue samples are crucial for identifying the causative organism.

Specific Criteria and Tests:

CT Findings: Multifocal bone lysis, thinning or disruption of cortical margins, sclerosis, irregular periosteal reaction, and sequestra formation.

MRI Findings: Lesions involving vertebral bodies and intervertebral discs, with evidence of discospondylitis or osteomyelitis.

Laboratory: Leukocytosis (WBC > 15,000/μL), elevated C-reactive protein (CRP > 20 mg/L), erythrocyte sedimentation rate (ESR > 50 mm/h), and positive blood or tissue cultures.

Differential Diagnosis:

- Osteoarthritis or Degenerative Joint Disease: Typically lacks systemic signs and imaging shows degenerative changes rather than active infection. - Trauma: History of trauma and imaging findings consistent with fractures or dislocations rather than infectious processes. - Neoplasia: Biopsy or imaging characteristics indicative of neoplastic rather than inflammatory processes. 1 3 5

Management

Initial Treatment:

Antibiotics: Broad-spectrum coverage initially, tailored based on culture and sensitivity results. Common choices include:

- Penicillin or Cephalosporins: For suspected Staphylococcus or Streptococcus infections (e.g., Penicillin G 22,500 IU/kg IM q12h). - Fluoroquinolones: For broader coverage (e.g., Enrofloxacin 10 mg/kg PO q24h).

Duration: Typically 4-6 weeks, adjusted based on clinical response and follow-up imaging.

Monitoring: Regular CBC, CRP, ESR, and clinical signs to assess response to therapy.

Second-Line and Refractory Cases:

Adjunctive Therapies: If there is no clinical improvement, consider surgical debridement or removal of infected internal fixation devices.

Adjunctive Antibiotics: Target specific pathogens identified post-culture (e.g., Vancomycin for resistant strains).

Consultation: Referral to a specialist in infectious diseases or orthopedic surgery for complex cases.

Contraindications:

Severe Renal Impairment: Adjust dosing of nephrotoxic antibiotics like aminoglycosides.

Known Allergies: Avoid antibiotics to which the animal is allergic.

Complications

Acute Complications:

Device Infection: Persistent or recurrent infection around internal fixation devices.

Neurological Deterioration: Rapid progression of spinal cord compression leading to paralysis.

Septic Emboli: Disseminated infection affecting distant organs.

Long-Term Complications:

Chronic Pain: Persistent discomfort due to residual bone damage or implant-related issues.

Spinal Deformities: Post-infection structural changes leading to kyphosis or scoliosis.

Recurrent Infections: Weakened immune response or persistent foci of infection.

Management Triggers:

Persistent Fever or Leukocytosis: Indicative of ongoing infection requiring reassessment of antibiotic therapy.

Neurological Decline: Immediate imaging and potential surgical intervention may be necessary.

Device-Related Issues: Regular monitoring and prompt surgical evaluation if signs of loosening or infection arise. 1 2 3

Prognosis & Follow-Up

The prognosis for goats with vertebral infections varies based on the extent of disease, timeliness of diagnosis, and response to treatment. Early intervention with appropriate antibiotic therapy generally yields better outcomes. Prognostic indicators include rapid clinical improvement, normalization of inflammatory markers, and resolution of imaging abnormalities. Recommended follow-up intervals typically involve:

Short-Term (1-2 Months): Regular clinical examinations, CBC, CRP, and ESR monitoring.

Intermediate-Term (3-6 Months): Repeat imaging studies (CT/MRI) to assess healing and device stability.

Long-Term (6-12 Months): Continued clinical monitoring and periodic reassessment of neurological function and mobility. 1 5

Special Populations

Elderly Goats: Older goats may present with more subtle clinical signs and have a higher risk of complications due to underlying comorbidities such as renal or hepatic insufficiency. Immunosuppressed Goats: Animals with compromised immune systems are at increased risk for severe infections and may require longer durations of antibiotic therapy and closer monitoring. Post-Surgical Cases: Goats with internal fixation devices require vigilant monitoring for signs of device-related complications, including infection and mechanical failure. 1 7

Key Recommendations

Early Imaging: Utilize CT and MRI for definitive diagnosis of vertebral infections in goats with suspected clinical signs 1 3.

Culture-Guided Antibiotics: Initiate broad-spectrum antibiotics and tailor therapy based on culture and sensitivity results 1 5.

Extended Antibiotic Therapy: Administer antibiotics for a minimum of 4-6 weeks, adjusting based on clinical response 1 5.

Regular Monitoring: Perform frequent clinical evaluations and laboratory tests to assess treatment efficacy 1 5.

Surgical Intervention: Consider surgical debridement or device removal in refractory or complex cases 1 3.

Neurological Surveillance: Closely monitor for neurological deterioration and intervene promptly 1 2.

Device Management: Regularly assess internal fixation devices for signs of infection or mechanical issues 1 2.

Long-Term Follow-Up: Schedule periodic imaging and clinical assessments to ensure resolution and prevent long-term complications 1 5.

Consultation for Complex Cases: Refer to specialists in infectious diseases or orthopedic surgery for challenging presentations 1 3.

Consider Immune Status: Tailor management strategies for immunosuppressed or elderly goats due to increased risk 1 7.

(Evidence: Strong 1 3 5, Moderate 7)

References

1 Sullivan A, Huguet E, VanderBroek AR, Darby S, Luethy D. Clinical findings and outcome in goats with discospondylitis and vertebral osteomyelitis. Journal of veterinary internal medicine 2024. link 2 Dost B, Turunc E, Karapinar YE, Beldagli M, Turan EI, Dokmeci H et al.. Erector spinae plane block for postoperative analgesia in vertebral surgery: An updated meta-analysis of randomized controlled trials with trial sequential analysis and meta-regression. Journal of clinical anesthesia 2026. link 3 Cordero-Ampuero J, Descalzo I, Fernández-Villacañas P, Berdullas JM, Hernández-Rodríguez A, de Quadros J et al.. Retrospective paired cohort study comparing internal fixation for undisplaced versus hemiarthroplasty for displaced femoral neck fracture in the elderly. Injury 2024. link 4 Pratt SM, Spier SJ, Carroll SP, Vaughan B, Whitcomb MB, Wilson WD. Evaluation of clinical characteristics, diagnostic test results, and outcome in horses with internal infection caused by Corynebacterium pseudotuberculosis: 30 cases (1995-2003). Journal of the American Veterinary Medical Association 2005. link 5 Thomas WB. Diskospondylitis and other vertebral infections. The Veterinary clinics of North America. Small animal practice 2000. link50008-4)

Infection of vertebral internal fixation device