Severe trauma has a substantial impact on long-term functioning. Empiric quantitative data, as presented in this study, enable us to estimate the burden of injury and to evaluate the quality of trauma care programs.

In a prospective, randomised trial of 81 patients with fractures of the ankle of AO types A, B and C we compared two regimes of postoperative management after internal fixation. The patients were mobilised either non-weight-bearing with crutches or weight-bearing in a below-knee walking plaster. We found a temporary benefit in subjective evaluation only (65 v 50 points, Mann-Whitney test, cft, p = 0.02) for those with a below-knee walking plaster. There were no significant differences between the groups in the loaded dorsal range of movement (25° v 23°, Mann-Whitney test, cft, p = 0.16) or in the overall clinical result. Both treatments were considered to be satisfactory and their choice depends on the ability to mobilise non-weight-bearing, wound healing, the type of work and personal preference.

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The performance of our proposed BISS model was superior to that of the TRISS model in the populations under investigation. Nevertheless, given the ease of assessment and the objective value of the base deficit, it may be considered as a good method to predict outcome and evaluate care of trauma patients. Whether this can be translated to trauma patients in general needs further investigation.