Perbandingan Luaran Pembedahan Approach Posterior dan Anterolateral pada Total Hip Arthroplasty Pasien Osteoarthritis dan Osteonekrosis Panggul di Rumah Sakit Ciptomangunkusumo dan Rumah Sakit Fatmawati = Comparison of Surgical Outcomes Between Posterior and Anterolateral Approaches in Total Hip Arthroplasty for Patients with Hip Osteoarthritis and Osteonecrosis at Cipto Mangunkusumo Hospital and Fatmawati Hospital