Background: Little is known about the incidence of haematoma, and clinical correlates among orthogeriatric patients. Aims: This study aims to describe the incidence of haematoma after surgical repair of hip fracture and to identify the clinical correlates of haematoma among orthogeriatric patients. Methods: Two orthopaedic surgeons and a dedicated operator using ultrasound technique, each other in blindness, evaluated 154 orthogeriatric patients during their hospital stay. All patients received a comprehensive geriatric assessment. We investigated the concordance between clinical diagnosis and ultrasound detection of haematoma, and then we explored the clinical correlates of the onset of post-surgical haematoma. Results: Blood effusion at the surgical site was detected in 77 (50%) patients using ultrasound technique; orthopaedic surgeons reached a clinical agreement about post-surgical haematoma in 18 (23%) patients. The sensitivity of clinical evaluation was 0.66, and the specificity was 0.70. Independent of age, clinical, pharmacological, and surgical confounders, proton pump inhibitors (PPIs) were associated with post-surgical haematoma (OR 2.28; 95% CI 1.15–4.49). A tendency towards association was observed between selective serotonin reuptake inhibitors and post-surgical haematoma (OR 2.10; 95% CI 0.97–4.54), Conclusions: Half of older patients undergoing surgical repair of proximal femoral fracture develop a post-surgical haematoma. Clinical assessment, even if made by senior orthopaedic surgeons, underestimates the actual occurrence of post-surgical haematoma compared to ultrasound detection. Ultrasound technique may help to detect haematoma larger than 15 mm better than clinical assessment. PPIs’s use is a risk factor for post-surgical haematoma independent of several medical and surgical confounders.
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