Osteomyelitis of the Jaw

Osteomyelitis of the jaw is an inflammatory infection involving the medullary cavity of the jaw bone that progressively extends to the cortical bone, periosteum, and surrounding soft tissues. The condition results from microbial invasion leading to suppuration, vascular compromise, ischemia, and eventual bone necrosis.

The mandible is more commonly affected than the maxilla due to its relatively poor blood supply and dense cortical structure.

The infection commonly arises from odontogenic sources such as untreated dental infections, traumatic extraction, mandibular fractures, or postoperative contamination.

Pathophysiology

Osteomyelitis develops following bacterial invasion into bone tissue through:

• Dental infection (periapical or periodontal origin)

• Trauma or fractures

• Surgical procedures

• Hematogenous spread (rare in jaws)

Disease progression occurs through several stages:

• Bacterial proliferation within cancellous bone

• Inflammatory edema increases intraosseous pressure

• Compression of blood vessels reduces perfusion

• Ischemia develops leading to bone necrosis

• Necrotic bone separates forming sequestrum

• Periosteal reaction produces new bone (involucrum)

• Pus tracks through soft tissue forming intraoral or extraoral sinus tracts

Common causative organisms include:

• Streptococcus species

• Staphylococcus aureus

• Anaerobic bacteria

• Mixed oral flora

Risk Factors

• Untreated dental caries

• Dental abscess

• Trauma or fractures

• Recent tooth extraction

• Poor oral hygiene

• Diabetes mellitus

• Malnutrition

• HIV/AIDS

• Immunosuppression

• Radiotherapy to jaw (osteoradionecrosis risk)

• Tobacco use

Classification

Acute Osteomyelitis

• Duration less than 2–4 weeks

• Severe inflammation without sequestrum formation

Subacute Osteomyelitis

• Mild symptoms

• Partial bone destruction

Chronic Osteomyelitis

• Persistent infection

• Sequestrum formation

• Sinus tract formation

• Recurrent discharge

Signs and Symptoms

• Fever

• Jaw pain (deep throbbing pain)

• Facial swelling

• Tenderness over affected bone

• Trismus (jaw stiffness)

• Malaise and fatigue

• Tooth mobility or tooth loss

• Difficulty chewing

• Pus discharge intraorally or extraorally

• Sinus tract formation

• Regional lymphadenopathy

• Paraesthesia or numbness (inferior alveolar nerve involvement)

Diagnostic Criteria

Early Stage

• Malaise and fever

• No obvious swelling initially

• Painful teeth in affected area

• Enlarged regional lymph nodes

• Difficulty mastication

Progressive Stage

• Increasing pain and swelling

• Tooth loosening

• Suppuration

Late / Chronic Stage

• Bone necrosis

• Persistent swelling

• Sinus formation through skin or oral mucosa

• Continuous pus discharge

• Sequestrum formation

Investigations

Radiological Investigations

• Orthopantomogram (OPG)

• Mandibular lateral oblique view

• Water’s view (maxilla/midface)

Early Radiographic Features

• Widened periodontal ligament space

• Loss of normal trabecular pattern

• Patchy radiolucency

Chronic Stage Features

• Sequestrum formation

• Mixed radiolucent–radiopaque appearance

• Cortical bone destruction

• Periosteal new bone formation

Laboratory Investigations

• Culture and sensitivity of pus

• Full blood count (leukocytosis)

• ESR or CRP elevation

• Blood glucose testing

• HIV testing where indicated

CT scan may be useful in complicated or extensive disease.

Management

Management combines surgical intervention and antimicrobial therapy.

Non-Pharmacological Management

• Hospital admission for severe infection

• Incision and adequate drainage of abscess

• Removal of infection source (extraction or endodontic treatment)

• Sequestrectomy after radiological confirmation

• Surgical debridement of necrotic bone

• Irrigation of infected cavity

• Nutritional support

• Optimization of systemic diseases

Pharmacological Treatment

(According to Tanzania Standard Treatment Guidelines – 2022)

First-Line Antibiotic Therapy

• Amoxicillin 500 mg orally every 8 hours for 5–7 days

• Metronidazole 400 mg orally every 8 hours for 5–7 days

Severe Infection / Hospitalized Patient

• Ceftriaxone 1–2 g IV once daily

• Metronidazole 500 mg IV every 8 hours

Switch to oral therapy after clinical improvement.

Penicillin Allergy

• Clindamycin 300 mg orally every 6–8 hours

Culture-Guided Therapy

• Modify antibiotics according to sensitivity results when available

Complications

• Pathological mandibular fracture

• Chronic draining sinus

• Facial cellulitis

• Deep neck space infection

• Sepsis

• Osteonecrosis

• Spread to cranial bones

• Inferior alveolar nerve damage

Prevention

• Early treatment of dental infections

• Proper aseptic technique during dental procedures

• Good oral hygiene practices

• Timely management of dental trauma

• Glycemic control in diabetic patients

• Adequate postoperative dental care

• Avoid unnecessary tooth extractions in immunocompromised patients

Patient Education

• Complete prescribed antibiotics fully

• Maintain oral hygiene

• Attend follow-up appointments

• Report persistent swelling or discharge

• Avoid self-medication

• Seek early dental care for tooth pain

Prognosis

Acute osteomyelitis responds well to early antibiotic therapy and drainage. Chronic disease may require repeated surgical intervention, but prognosis improves significantly after removal of necrotic bone and control of systemic risk factors.