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Tendon adaptation to bone shortening.

The ability of tendon to adapt its length to imposed conditions was tested in rat soleus. Shortening of one tibia left tendon insertions intact, but reduced the distance between them. Tendon lengths were found to decrease after a short period of recovery (1 or 2 months) whether surgery was performed in young or adult animals. Comparison of tibia and tendon length correlation in control rats of different ages and in experimental animals showed that adaptation was more complete in young rats than in adult rats. A long period of recovery seemed to improve adaptation only in young rats. Hydrothermal isometric tension measurements indicated that collagen remodeling occurred during tendon adaptation to bone length, with the process being more marked at the muscle-tendon junction.