Original citation: J. Clin. Invest. 117:1627–1636 (2007). doi:10.1172/JCI30765.
Citation for this corrigendum: J. Clin. Invest. 118:3812 (2008). doi:10.1172/JCI30765C1.
The formula used to calculate cartilage repair is described incorrectly on page 1635. The correct description of the formula appears below.
The cartilage repair score at day 28 was calculated by subtracting the number from 1. Positive scores indicate percentage of improvement, and negative scores indicate the percentage by which the score worsened, compared with day 7.
The authors regret the error.