Zhou H, et al. - In this study, researchers measured posterior knee capsule length at various durations of remobilization after knee immobilization as well as correlated with the recovery of knee range of motion. The present data indicated that unassisted remobilization will not restore posterior knee capsule shortening and the reduction in knee extension for knee injuries requiring more than 2 weeks of immobilization. The results obtained from the study support the role of the posterior capsule in knee joint contracture and the need to reduce the duration of immobility and to aid the recovery of the range of knee extension after a sports injury.