The purpose of this study is to identify the association between analgesic management with blockade of the iliac fascia versus intravenous analgesia with the presence of delirium during hospital stay in patients admitted to the orthogeriatric clinical care center, to determine the opioid consumption of both groups of patients during hospitalization and determine the risk factors that may be associated with a greater presentation of delirium.

Nowadays, with the increase in the geriatric population, there is evidence of an increase in the prevalent conditions in this group, finding within them fragility hip fractures. Additionally, most of these patients have a large number of associated comorbidities, which may require greater specialization in care.

To reduce the possible complications that may be related, different management protocols have been implemented, including pain management strategies such as preventive analgesics, regional blocks, and early surgery. Conventional treatment with the use of intravenous medications can have unwanted effects in geriatric patients with hip fracture, especially in those with greater comorbidity, since medications such as opioids can cause multiple adverse effects, including delirium. Also, not treating pain properly can cause complications such as depression and ulcers in addition to delirium.

This is why the objective of this study is to define whether there is any association between the presentation of delirium in patients over 65 years of age with hip fracture who undergo iliac fascia block upon admission compared to those who receive only IV analgesia Therefore, this retrospective cohort study will be carried out with which it is sought to contribute to the knowledge to continue carrying out early pain management, with the aim of achieving better pain control, a decrease in opioid consumption and thus having a lower number of patients with delirium during hospitalization.

Inclusion Criteria:

• Patients over 65 years of age with a diagnosis of hip fracture due to fragility who are admitted to the Orthogeriatric clinical care center at the Santa Fe de Bogotá Foundation and the San José Infantil University Hospital between January 2019 and December 2020. These two institutions are selected Since they have a model of care for this type of patient, it is similar and therefore comparable.

Exclusion Criteria:

• Patients diagnosed with delirium on admission to the emergency room.
• Patients with hip fracture caused by high energy trauma
• Patients with hip fracture related with tumoral disease or metastasis

• Patients older than 65 years with a diagnosis of hip fracture who are admitted to the Orthogeriatric Clinical Care Center at the Santa Fe de Bogotá Foundation in a period between January 2019 and December 2020.
• Patients over 65 years of age with a diagnosis of hip fracture who enter the Excellence Program in Orthogeriatrics at the San José Infantil University Hospital in a period between January 2019 and December 2020.