In the Journals

Study shows relationship between obesity and operative time during TJR

Researchers have identified a relationship between obesity and operative time, and patient age and length of hospital stay among patients who underwent total hip and knee arthroplasty that may be of use in planning operating lists.

The researchers retrospectively reviewed 589 patients who underwent primary hip and knee arthroplasty. Age, body mass index (BMI) and comorbidities were recorded, and effects on operative duration and length of stay were analyzed.

Study results showed a statistically significant change in mean operative time with BMI and type of joint arthroplasty. Among patients with an average BMI of 30 kg/m2, the researchers found an expected operative time of 122 minutes for total hip arthroplasty and of 110 minutes for a total knee arthroplasty, whereas a five-point increase in BMI was expected to increase operative time by approximately 7 minutes.

Through linear regression of log10-transformed length of stay, the researchers found statistically significant effects on mean log-length of stay with patient age, BMI and comorbidities, but not with type of joint arthroplasty.

Additionally, length of stay was expected to increase by 13% with a 10-year increase in age, by 15% with a five-point increase in BMI and by 14% in patients with cardiac comorbidities, according to the researchers.

Disclosure: The authors have no relevant financial disclosures.

Researchers have identified a relationship between obesity and operative time, and patient age and length of hospital stay among patients who underwent total hip and knee arthroplasty that may be of use in planning operating lists.

The researchers retrospectively reviewed 589 patients who underwent primary hip and knee arthroplasty. Age, body mass index (BMI) and comorbidities were recorded, and effects on operative duration and length of stay were analyzed.

Study results showed a statistically significant change in mean operative time with BMI and type of joint arthroplasty. Among patients with an average BMI of 30 kg/m2, the researchers found an expected operative time of 122 minutes for total hip arthroplasty and of 110 minutes for a total knee arthroplasty, whereas a five-point increase in BMI was expected to increase operative time by approximately 7 minutes.

Through linear regression of log10-transformed length of stay, the researchers found statistically significant effects on mean log-length of stay with patient age, BMI and comorbidities, but not with type of joint arthroplasty.

Additionally, length of stay was expected to increase by 13% with a 10-year increase in age, by 15% with a five-point increase in BMI and by 14% in patients with cardiac comorbidities, according to the researchers.

Disclosure: The authors have no relevant financial disclosures.