Joint Replacement Statistics from LEAP Program
Sample Description
The statistics presented are based on data from 521 total hip replacements (THR) and 608 total knee replacements (TKR). The sample includes hip and knee replacement patients enrolled in the LEAP research program who had surgery on or after January 1 2014, and have complete pre-surgery data and 1 year post-surgery data.
Demographics
Satisfaction
WOMAC Scores
Clinically important improvement after surgery
For hip replacements, minimal clinically important difference (MCID) was defined as improvement of at least 29.26 points out of 100 for WOMAC pain, 26.54 points for WOMAC function, and 25.91 points for WOMAC stiffness1. The corresponding definitions for knee replacement were 22.87 points for WOMAC pain, 19.01 points for WOMAC function, and 14.53 points for WOMAC stiffness2.
1 Quintana JM, Escobar A, Bilbao A, Arostegui I, Lafuente I, Vidaurreta I. Responsiveness and clinically important differences for the WOMAC and SF-36 after hip joint replacement. Osteoarthr Cartil. 2005 Dec;13(12):1076–83.
2 Escobar A, Quintana JM, Bilbao A, Aróstegui I, Lafuente I, Vidaurreta I. Responsiveness and clinically important differences for the WOMAC and SF-36 after total knee replacement. Osteoarthr Cartil. 2007 Mar;15(3):273–80.
Relative change from baseline
The median percentage change from baseline for each WOMAC scale is shown in the chart below. Error bars indicate interquartile ranges (25th to 75th percentile). For example: 12 months after surgery, hip replacement patients have a median 91% improvement in WOMAC pain score, while knee replacement patients have a median 75% improvement in WOMAC pain score.
