• Harriet U Aronow, Phoebe Sharkey, Hilary C Siebens, Susan D Horn, Randall J Smout, Gerben DeJong, Michael C Munin, and Craig S Radnay.
• Nursing Research and Development, Cedars-Sinai Medical Center, 8700 Beverly Blvd, Suite 2021, Los Angeles, CA 90048, USA. harriet.aronow@cshs.org
• PM R. 2012 Apr 1;4(4):264-72.

ObjectiveTo assess whether clusters of patients with hip fracture and with distinct initial recovery trajectories (IRT) could be identified by using practice-based evidence data and to examine the validity of these data.DesignAnalysis of multisite prospective observational cohort study database.SettingEighteen skilled nursing and inpatient rehabilitation facilities.PatientsPatients with hip fractures (N = 226) treated with joint replacement and admitted to skilled nursing or inpatient rehabilitation facilities, subset (n = 85), with telephone follow-up results approximately 8 months after rehabilitation discharge. Patients' ages were 76.8 ± 11.4 years; the majority were women (78%) and white (87%).MethodsMeasurements included medical severity by using the Comprehensive Severity Index and functional levels by using Functional Independence Measure (FIM). The IRT was calculated for each patient as the rate of change in function from the time of surgery to rehabilitation admission. We used cluster analysis to partition patients into subsets that shared common IRT scores. Validity was explored by comparing subgroups across patient characteristics and treatment patterns. Significance was defined as P ≤ .05.Main Outcomes MeasurementsIRT grouping, Comprehensive Severity Index, FIM, discharge location, living location at follow-up.ResultsWe identified 3 patient clusters with differentiated IRT scores: group 1: 4.96 ± 2.45 (range, 0.4-8.6) FIM point change per day; group 2: 12.42 ± 2.51 (range, 8.9-17.0); group 3: 26.80 ± 13.78 (range, 17.5-70.0). Clinical group validation was established from statistically different Comprehensive Severity Index scores on admission; FIM scores at admission, discharge, and follow-up; and discharge and 8-month living settings. Calculation of IRT recovery curves by using FIM scores and associated time in days through logarithmic regression curves confirmed each group's IRT remained distinct through rehabilitation and follow-up.ConclusionsThe IRT concept appears to be valid in patients with hip fracture who were treated with hip arthroplasty, and may assist in evaluating and comparing the effectiveness of postacute rehabilitation services.Copyright © 2012 American Academy of Physical Medicine and Rehabilitation. Published by Elsevier Inc. All rights reserved.

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