Inferior alveolar and mental nerve injuries associated with open reduction and internal fixation of mandibular fractures: a Seven Year retrospective study.
OBJECTIVE
To document adverse neurosensory changes in the inferior alveolar nerve (IAN) and mental nerve (MN) after surgical mandibular fracture treatment and to identify risk factors associated with these changes.


METHODS
A retrospective study of patients surgically treated for mandibular fractures. The primary study variable was the postoperative change in IAN/MN neurosensory examination after fracture fixation. Risk factors were categorized as demographic, anatomic, experience of the operator, fracture displacement and number of miniplates placed at each fracture site. Appropriate statistics were computed.


RESULTS
209 patients with 293 fractures were analysed. One hundred twenty fractures (41%) were located between the lingula and mental foramen, and 173 fractures (59%) were located distal to the mental foramen. Two hundred seventeen (41%) were displaced by 5 mm or more. In 38 fractures (13%), the IAN/MN neurosensory status worsened after treatment. In a multivariate model, fracture displacement, operator inexperience and two plate fixation were associated with a statistically significant risk (P ≤ 0.05) for postoperative deterioration of IAN/MN sensation.


CONCLUSIONS
Fixation with two miniplates, fracture displacement of 5 mm or more and operator inexperience were associated with an increased risk for deterioration of the IAN/MN neurosensory status after treatment of mandibular fractures.
Department of Orthopaedics, Yantai Affiliated Hospital of Binzhou Medical University, Shandong Province 264100, China. Electronic address: fforoffice@163.com.
Qinyong
Q
Song
Department of Orthopaedics, Yantai Affiliated Hospital of Binzhou Medical University, Shandong Province 264100, China. Electronic address: lforoffice@163.com.
Shanhui
S
Li
Department of Oral and Maxillofacial Surgery, School of Dental Sciences, Sharda University, Plot 32, 34, Knowledge Park 3, Greater Noida, 201308 Uttar Pradesh, India. Electronic address: pavanpatil2000@yahoo.co.uk.
Pavan Manohar
PM
Patil
D000293:Adolescent; D000328:Adult; D001860:Bone Plates / Q000009:adverse effects; D002680:Chin / Q000294:innervation*; D002983:Clinical Competence; D005260:Female; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal / Q000009:adverse effects / Q000379:methods*; D006801:Humans; D004204:Joint Dislocations / Q000601:surgery; D008297:Male; D008337:Mandibular Fractures / Q000601:surgery*; D008340:Mandibular Nerve / Q000503:physiopathology*; D012189:Retrospective Studies; D012307:Risk Factors; D012684:Sensory Thresholds / Q000502:physiology; D020886:Somatosensory Disorders / Q000209:etiology; D013697:Thermosensing / Q000502:physiology; D014110:Touch / Q000502:physiology; D061221:Trigeminal Nerve Injuries / Q000209:etiology*; D055815:Young Adult
Complication; Mandible fracture; Miniplate fixation; Nerve injury; Open reduction