Transient osteoporosis of hip is an uncommon, self-limiting clinical condition of unknown etiology characterized by an acute onset of hip pain, an antalgic gait and limited ranges of motion. Frequently this is followed by spontaneous regression of the symptoms within a few months (6 to 8 months), therefore conservative treatment is the best therapeutic strategy. Surgical decompression are performed only for the conservative therapy resistant patients. In this report, it is presented a 32-years old female who had pregnancy-associated transient osteoporosis and showed satisfactory improvement with conservative treatment via adding vitamin K2. Vitamin K2 may be considered as a treatment option before surgical intervention in the patients with transient osteoporosis of the hip who did not adequately respond to previously described conservative treatment modalities.