You are presented with a paragraph from a COVID-19 literature. Classify the topics of this piece of text by choosing from the following categories:

- Epidemic Forecasting: The content relates to predictions about the spread of COVID-19.
- Treatment: The paragraph discusses therapeutic methods or medication for COVID-19.
- Prevention: The content covers measures to prevent the spread of COVID-19.
- Mechanism: The paragraph explains the biological mechanisms of the virus.
- Case Report: The content is a report of a COVID-19 case.
- Transmission: The paragraph discusses how COVID-19 is transmitted.
- Diagnosis: The content is about diagnosing COVID-19 in individuals.

Your classification should be provided as an element within a JSON array. The array should be formatted with topics enclosed in double quotes and separated by commas, following the JSON format, for example: ["Topic1", "Topic2", ...]. Include all applicable topics within the array. Your output should be a valid JSON array, and no additional text should be included in your response.

Article:

Geriatric hip fractures benefit from timely surgery. At the onset of the corona-virus disease 2019 (COVID-19) pandemic, shelter-in-place (SIP) orders were mandated in high-risk cities. The authors hypothesized that geriatric patients with hip fractures were more likely to present to the hospital greater than 24 hours after injury during SIP orders. They retrospectively reviewed patients 65 years or older who presented with hip fractures between March 20, 2020, and May 24, 2020 (SIP group), and between March 20, 2019, and May 24, 2019 (historical group). Primary outcomes were incidence of presentation greater than 24 hours after injury and mean number of days between injury and presentation. Secondary outcomes were incidence of preoperative deep venous thrombosis (DVT) and 30- and 90-day mortality rates. Thirty-three patients comprised the SIP group, and 50 patients comprised the historical group. There were no significant differences in their demographics or medical comorbidities. The SIP group was more likely to present greater than 24 hours after injury (P=.05) and presented a greater number of days after injury (P=.02). There was a significant difference in the incidence of preoperative DVT (P=.03). There were no significant differences in 30- and 90-day mortality rates. Geriatric patients who sustained hip fractures during SIP restrictions for COVID-19 were more likely to present greater than 24 hours after injury, have a greater number of days between injury and presentation, and be diagnosed with a preoperative DVT. [Orthopedics. 2021;44(4):223-228.].
["Prevention"]