Range of Extension Correlates with Posterior Capsule Length after Knee Remobilization

Introduction Knee injuries are common in sports, and post-injury immobilization is often required to protect healing tissues and alleviate pain, but both the injury and the immobilization can lead to a knee contracture. Knee flexion contractures limit performance. Previous research has identified posterior knee capsule fibrosis as a contributor to immobility-induced knee flexion contractures. This study aims to measure posterior knee capsule length at various durations of remobilization after knee immobilization and to correlate with the recovery of knee range of motion. Methods 259 male Sprague-Dawley rats had one knee extra-articularly immobilized in flexion with a Delrin® plate at a 45° angle for one of six durations: 1, 2, 4, 8, 16, or 32 weeks, followed by spontaneous remobilization after plate removal, which lasted zero, one, two, and four times the duration of immobilization. The contralateral knees served as controls. The posterior knee capsule length was measured by histomorphometry. These measures were correlated with previously published range of motion data from the same cohort of specimens. Results Knees immobilized for 1 and 2 weeks partially recovered posterior capsule length (P>0.05). Knees immobilized beyond 2 weeks failed to recover posterior capsule length irrespective of the duration of remobilization (P

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