The present invention relates to a composition for treating joint diseases and a preparation method therefor and, more specifically, to a composition comprising a cross-linked
hyaluronic acid hydrogel obtained by a cross-linking reaction between
hyaluronic acid or a pharmaceutically acceptable salt thereof and an alkylene
diamine cross-linking agent, and a preparation method therefor. The composition has a storage modulus (G', 2.5 Hz, 25° C) of 250-850 Pa, has a degree of cross-linking (CrD; number of cross-linking agents bound to both sides / number of
hyaluronic acid units) of less than 5 mol %, and exhibits an effect of alleviating symptoms of joint diseases for a period of 3 months or longer when administered once as an injectable formulation to a patient. The composition has a low degree of crosslinking that allows flexible adjustment of the
dosing interval while maintaining high
biocompatibility,
in vivo persistence, and a clinically meaningful storage modulus, thereby reducing patient burden caused by frequent administration and being expected to provide an excellent clinical effect of alleviating
joint disease symptoms for three months or longer.