الفهرس 
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Abstract
Background: Low level laser has been conducted for treatment of bone fracture on animal and had shown positive results provided that the laser energy is delivered at optimal dose with appropriate parameters to gain best results however a little research in the literature has conducted on the effect of low level laser on human bone fracture. Purpose of the study: the aim of the study was to assess the radiological and clinical difference of the effect of low level laser therapy on the delayed bone healing of patients with different bone fractures. Patient and methods: This was a prospective study conducted in Benha university hospital on 33 patients with delayed and non union of bone fractures via low level laser diode wavelength 905 nm. There were 33 subject included in this study (27 male 6 female ) with mean age group ± 34.43 range (24 years to 67 years), the mean delayed of union was ± 6.68 range (3 months to 15 months ). Results: Bone fracture union was achieved in mean period ± 1.7 ( 1 month to 4.1 months) which has shown about 70% improvement of the treated group, the mean number of sessions patient had were ± 23.375 (range 15 sessions to 50 sessions) and the mean visual analog scale (VAS) ± 1.3 range from (0 to 6). Conclusion: the present study indicate that Low level laser therapy is an effective modality for treatment of delayed bone fracture ,can relieve pain
and increase range of motion of the associated stiff joints with no adverse
effect provided that adequate patient selection has conducted.