Research objectives: To present the epidemiological characteristics of patients who were treated with acute physical rehabilitation at the Department of Physical Medicine and Rehabilitation with Rheumatology of KBC Split in the period from March 2021 to November 2022. Subjects and methods: This retrospective study was carried out at the Department of Physical Medicine and Rehabilitation with Rheumatology of KBC Split and included 100 patients treated with acute physical rehabilitation. Results: There were a total of 100 immobile geriatric patients. Among the patients who were rehabilitated by a ten-day acute rehabilitation at the Department of Physical Medicine and Rehabilitation with Rheumatology of the Split Clinical Hospital Center, there are two and a half times more female patients than male patients. Among the 100 patients observed, 41% of them went from complete or severe dependence to moderate or light dependence in activities of daily living and mobility. Immobile geriatric patients are two to six times more at risk of developing sarcopenia. Immobile geriatric patients who develop complications during rehabilitation have a poorer recovery than those without complications. The most common comorbidity was hypertension in 66% of patients and diabetes in 20% of patients. The most common complication is urinary infection (35%), followed by diarrhea (7%), pressure ulcers (6%) and disorders of consciousness (6%). Conclusion: Ten days of acute physical rehabilitation is not enough for a satisfactory recovery of patients. Almost all patients (96%) had one or more comorbidities in addition to the main disease for which they were treated at the Department of Physical Medicine and Rehabilitation with Rheumatology of KBC Split; in most cases it was hypertension. More than two thirds of patients had some of the complications during treatment; in most cases it was a urinary infection.