INTERRATER RELIABILITY FOR FUNCTION AND STRENGTH MEASUREMENTS IN THE ACUTE-CARE HOSPITAL AFTER ELECTIVE HIP AND KNEE ARTHROPLASTY

Objective. To determine the inter-rater reliability of function and st rength measurements in patients undergoing elective hip and knee arthr oplasty in an acute care setting. Method. Forty-four patients underwen t either total hip or knee arthroplasty. Patients were rated by 4 occu pational therapists and 7 physical therapists on their performance of 5 functional tasks: lower extremity dressing, toilet transfer, supine- to-sit transfer, sit-to-stand transfer, and ambulation to 100 feet. St rength measurements of the quadriceps femoris muscle were measured qua ntitatively with a Microfet hand-held dynamometer. Data were analyzed to determine inter-rater reliability using the Kappa statistic (K) for the functional tasks and the intra-class correlation coefficient (ICC ) for the strength measurements. Results. A high level of infer-rater reliability was achieved for lower extremity dressing, toilet transfer , supine-to-sit transfer, sit-to-stand transfer, and ambulation to to 100 feet, as evidenced by K values between 0.75 and 0.99. Reliability was also excellent for quantitative strength measurements using the dy namometer, with an ICC of 0.94. Conclusion. This study demonstrated ex cellent inter-rater reliability with measurements of function and stre ngth post-operatively after elective hip and knee arthroplasty. The pr actical implication is that by using a standardized measurement tool i n the acute care setting, the treatment team can more reliably assess patients' progress, which may aid clinical decision making.