Background: Patients with hip fracture are limited as to physical activity. It is difficult to evaluate the physical function of the legs at admission; however, it is easy to measure grip strength, which has been reported to be correlated with systemic muscular strength and physical function. The objective of this study was to investigate the utility of grip strength in predicting functional outcome after hip fracture.
Methods: Fifty-seven patients who underwent surgery for hip fracture were evaluated for height, weight, Body Mass Index (BMI), grip strength, bone density (femoral neck), hemoglobin, Hemoglobin A1c (HbA1c), Hasegawa's Dementia Scale-Revised (HDS-R), and albumin at admission and Functional Independence Measure (FIM) at discharge. Spearman's rank correlation coefficient was used to evaluate the relation between grip strength and the above variables. Furthermore, factors of walking acquisition were analyzed by logistic regression analysis and decision-tree analysis.
Results: Correlation analysis showed that grip strength was positively correlated with bone density at admission and FIM at discharge and negatively correlated with age. In the logistic regression analysis, the independent factor associated with walking acquisition was grip strength (OR 1.26; 95%CI 1.018-1.566; p=0.0339). In the decisiontree analysis, grip strength was the initial divergence variable for walking acquisition (the percentage with walking acquisition was 80.0% of the patients with grip strength ≧13.2 kg VS. 18.7% of the patients with grip strength < 13.2 kg).
Conclusions: Grip strength at admission was definitive in predicting the functional outcome of patients with hip fracture who underwent surgery.
Keywords: acute care hospital; functional prognosis; grip strength; lower extremity strength.