Why ultrasound guidance matters for ChondroFiller hip injectionChondroFiller, an injectable collagen scaffold delivered via ultrasound-guided clinic injection, sets within the hip joint and draws the body's own progenitor cells to repair cartilage damage. Around 70–85% of patients report significant pain relief without surgery or general anaesthetic.ChondroFiller, an injectable collagen scaffold delivered via ultrasound-guided clinic injection, sets within the hip joint and draws the body's own progenitor cells to repair cartilage damage. Around 70–85% of patients report significant pain relief without surgery or general anaesthetic.