Burn rehabilitation is comprehensive, complex and requires a multidisciplinary approach to optimize the patient's physical and psychosocial recovery related to burn. Aim: the study was made to evaluate the effect of lower limb rehabilitation on burn injured patients' outcomes (joint flexibility and muscle strength) during emergency phase. Design: a quasi-experimental design, study design was used to achieve the objectives of the study. Setting: The present study was conducted in burn unit at Assuit general hospital and Assuit university hospital. Subjects: purposive sample of 60 adults patients (males and females), they were divided into two equal groups (study and control). Tools: Patient assessment tool, joint flexibility assessment and muscle strength assessment. Results: This study was successed in minimizing muscles contracture to (6.67%) of study group versus (30.00%) of control group. Conclusion: Implementing the lower limb rehabilitation during emergency phase significantly improved the burn injured patient's outcomes (joint's flexibility and muscles strength). Recommendation: Rehabilitation exercises should be done as early as possible for patients with burn injury during emergency phase.