NEET MDS Lessons
Oral and Maxillofacial Surgery
Osteomyelitis is an infection of the bone that can occur in the jaw, particularly in the mandible, and is characterized by a range of clinical features. Understanding these features is essential for effective diagnosis and management, especially in the context of preparing for the Integrated National Board Dental Examination (INBDE). Here’s a detailed overview of the clinical features, occurrence, and implications of osteomyelitis, particularly in adults and children.
Occurrence
- Location: In adults, osteomyelitis is more common in
the mandible than in the maxilla. The areas most frequently affected
include:
- Alveolar process
- Angle of the mandible
- Posterior part of the ramus
- Coronoid process
- Rarity: Osteomyelitis of the condyle is reportedly rare (Linsey, 1953).
Clinical Features
Early Symptoms
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Generalized Constitutional Symptoms:
- Fever: High intermittent fever is common.
- Malaise: Patients often feel generally unwell.
- Gastrointestinal Symptoms: Nausea, vomiting, and anorexia may occur.
-
Pain:
- Nature: Patients experience deep-seated, boring, continuous, and intense pain in the affected area.
- Location: The pain is typically localized to the mandible.
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Neurological Symptoms:
- Paresthesia or Anesthesia: Intermittent paresthesia or anesthesia of the lower lip can occur, which helps differentiate osteomyelitis from an alveolar abscess.
-
Facial Swelling:
- Cellulitis: Patients may present with facial cellulitis or indurated swelling, which is more confined to the periosteal envelope and its contents.
- Mechanisms:
- Thrombosis of the inferior alveolar vasa nervorum.
- Increased pressure from edema in the inferior alveolar canal.
- Dental Symptoms: Affected teeth may be tender to percussion and may appear loose.
-
Trismus:
- Limited mouth opening due to muscle spasm or inflammation in the area.
Pediatric Considerations
- In children, osteomyelitis can present more severely and may be
characterized by:
- Fulminating Course: Rapid onset and progression of symptoms.
- Severe Involvement: Both maxilla and mandible can be affected.
- Complications: The presence of unerupted developing teeth buds can complicate the condition, as they may become necrotic and act as foreign bodies, prolonging the disease process.
- TMJ Involvement: Long-term involvement of the temporomandibular joint (TMJ) can lead to ankylosis, affecting the growth and development of facial structures.
Radiographic Changes
- Timing of Changes: Radiographic changes typically occur only after the initiation of the osteomyelitis process.
- Bone Loss: Significant radiographic changes are noted only after 30% to 60% of mineralized bone has been destroyed.
- Delay in Detection: This degree of bone alteration requires a minimum of 4 to 8 days after the onset of acute osteomyelitis for changes to be visible on radiographs.
- NOE fracture test: Bow string test
- Blow-out fracture types:
- Pure: Orbital rim intact
- Impure: Rim + facial bones involved
- LeFort fracture hemorrhage source: Fractured septum
- CSF rhinorrhea test: Beta-2 transferrin
Primary Bone Healing and Rigid Fixation
Primary bone healing is a process that occurs when bony fragments are compressed against each other, allowing for direct healing without the formation of a callus. This type of healing is characterized by the migration of osteocytes across the fracture line and is facilitated by rigid fixation techniques. Below is a detailed overview of the concept of primary bone healing, the mechanisms involved, and examples of rigid fixation methods.
Concept of Compression
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Compression of Bony Fragments: In primary bone healing, the bony fragments are tightly compressed against each other. This compression is crucial as it allows for the direct contact of the bone surfaces, which is necessary for the healing process.
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Osteocyte Migration: Under conditions of compression, osteocytes (the bone cells responsible for maintaining bone tissue) can migrate across the fracture line. This migration is essential for the healing process, as it facilitates the integration of the bone fragments.
Characteristics of Primary Bone Healing
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Absence of Callus Formation: Unlike secondary bone healing, which involves the formation of a callus (a soft tissue bridge that eventually hardens into bone), primary bone healing occurs without callus formation. This is due to the rigid fixation that prevents movement between the fragments.
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Haversian Remodeling: The healing process in primary bone healing involves Haversian remodeling, where the bone is remodeled along the lines of stress. This process allows for the restoration of the bone's structural integrity and strength.
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Requirements for Primary Healing:
- Absolute Immobilization: Rigid fixation must provide sufficient stability to prevent any movement (interfragmentary mobility) between the osseous fragments during the healing period.
- Minimal Gap: There should be minimal distance (gap) between the fragments to facilitate direct contact and healing.
Examples of Rigid Fixation in the Mandible
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Lag Screws: The use of two lag screws across a fracture provides strong compression and stability, allowing for primary bone healing.
-
Bone Plates:
- Reconstruction Bone Plates: These plates are applied with at least three screws on each side of the fracture to ensure adequate fixation and stability.
- Compression Plates: A large compression plate can be used across the fracture to maintain rigid fixation and prevent movement.
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Proper Application: When these fixation methods are properly applied, they create a stable environment that is conducive to primary bone healing. The rigidity of the fixation prevents interfragmentary mobility, which is essential for the peculiar type of bone healing that occurs without callus formation.