Predictors of post‐hip fracture knee pain in hospitalized older adults with intertrochanteric femoral fracture

Background Post‐hip fracture knee pain (PHFKP) is an important issue that contributes to reduced gait speed and prolonged hospitalization. Femoral morphology has been reported to contribute to the development of PHFKP, but an independent association has not been confirmed and clinically applicable cutoffs for predicting the development of PHFKP remain unclear. Objective To determine whether femoral morphology and knee extension range of motion limitation are independent factors in PHFKP and to determine cutoffs for predicting the development of PHFKP. Design Retrospective chart review study. Setting Convalescent inpatient rehabilitation hospital. Participants Patients in a convalescent ward after intertrochanteric femoral fracture surgery. Main Outcome Measures PHFKP development, radiographic femoral morphology (leg length discrepancy and neck‐shaft angle), and knee extension range of motion limitation. Results PHFKP developed in 36 (35%) of the 103 patients enrolled. The PHFKP group had a longer hospital stay (p = .029), greater weight (p = .031), greater knee extension range of motion limitation (p = .001), and more varus neck‐shaft angle (p