International Journal of Oral and Maxillofacial Surgery
Clinical Paper
Head and Neck OncologyCriteria for trismus in head and neck oncology
Head and Neck Oncology
Section snippets
Patients and methods
Patients 18 years old or above, treated for cancer of the oral cavity or oropharynx at the Department of Oral and Maxillofacial Surgery, Division Oncology, University Medical Center Groningen, were invited to participate in this cross-sectional study. Patients were informed about this study by means of a letter 1 week prior to their regular follow-up appointment. During the appointment the physician informed the patient again and invited the patient to participate. The patients were recruited
Results
Of the 101 patients who were asked to participate, 12 patients did not fulfil the inclusion criteria or refused to participate in the study. Thus, in total 89 patients (88%) participated in the study. Descriptive statistics with respect to tumour type and site and the number of patients who had received radiotherapy are presented in Table 1. Dental status is reported in Table 2. During the assessment, 20 patients in total did not wear their dentures of which 8 did not wear their upper dentures
Discussion
A mouth opening of 35 mm or less should be regarded as trismus in head and neck oncology patients. The arguments for this cut-off point are (1) the maximal proportion of correctly predicted patients of 0.81, (2) the area under curve of 0.87 and (3) the lack of significant difference in mandibular function impairment when a higher cut-off point is applied. For the subgroups, dentate, partially dentate and edentulous, similar analyses were performed but no clear cut-off point per group could be
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