Perancangan Awal Implan Obat Anti-Tuberkulosis Tulang Belakang dan Pengaruh Kombinasi Poly(D,L-Lactide-Co-Glycolide) 50:50, Poly(D,L-Lactide-Co-Glycolide) 90:10, Polylactic Acid untuk Pelepasan Berkelanjutan Obat Anti-Tuberkulosis Isoniazid = Preliminary Design of Spinal Tuberculosis Drug Implant and The Effect of Poly(D,L-Lactide-co-Glycolide) 50:50, Poly(D,L-Lactide-co-Glycolide) 90:10, dan Polylactic Acid Combination for the Extended Release of Anti-Tuberculosis Drug Isoniazid