Aim: Evaluation of radiological measurements of proximal humerus fractures treated with PHILOS plate using a prognostic multiplication factor. Material and methods: The study included 100 patients who met specific criteria. Eligible participants were those aged 18 years and above, diagnosed with proximal humerus fractures classified as Neer’s type 2, 3, or 4, and who underwent surgical fixation with the PHILOS plate. Additionally, patients needed to be available for follow-up for at least 12 months post-surgery. Exclusion criteria encompassed pathological fractures, pre-existing shoulder joint conditions, previous shoulder surgeries or fractures, and incomplete radiological data. Results: Articular surface congruence significantly improved from 72.4% pre-operatively to 90.8% at 12 months, demonstrating effective restoration of joint surface alignment. Screw positioning improved markedly post-operatively, with deviations decreasing from a mean of 4.3 mm pre-operatively to 0.2 mm at 12 months, reflecting excellent fixation stability. Callus formation, as per Ferguson and Gagne scoring, increased from a mean score of 1.2 at 3 months to 8.9 at 12 months, indicating progressive healing. Bone density measurements showed a steady increase from 0.85 g/cm² pre-operatively to 0.98 g/cm² at 12 months, suggesting improved bone healing and integration around the fracture site.The mean score for age was 1.18 ± 0.35, for type of fracture 1.35 ± 0.42, for time to surgery 1.05 ± 0.30, for bone quality 1.12 ± 0.28, and for rehabilitation adherence 1.22 ± 0.32. Conclusion: Overall, the PHILOS plate proved to be an effective treatment method for proximal humerus fractures, with predictable outcomes using the prognostic factor model.