Volume 104(Suppl 2) Supplement 1 pgs. 1-94 April 6, 2022

1. Introductory Comments: Special Issue of the ARCO 2019 Biennial Meeting.

2. Decreased Ankyrin Expression Is Associated with Repressed eNOS Signaling, Cell Proliferation, and Osteogenic Differentiation in Osteonecrosis of the Femoral Head.

3. Relationship Between Blood Flow and Collapse of Nontraumatic Osteonecrosis of the Femoral Head.

4. Abnormal Lipid Profiles in Nontraumatic Osteonecrosis of the Femoral Head: A Comparison with Osteoarthritis Using Propensity Score Matching.

5. Evaluation of Radiographic Outcomes after Core Decompression for Osteonecrosis of the Femoral Head: The Beijing University of Chinese Medicine X-ray Evaluation Method.

6. The Discrepancy in the Posterior Boundary of Necrotic Lesion Between Axial and Oblique Axial Slices of MRI in Patients with Osteonecrosis of the Femoral Head.

7. Reliability and Repeatability of the China-Japan Friendship Hospital Typing Classification for Nontraumatic Osteonecrosis of the Femoral Head.

8. Predicting Collapse in Osteonecrosis of the Femoral Head Using a New Method: Preserved Angles of Anterior and Lateral Femoral Head.

9. Core Decompression and Bone Marrow Aspiration Concentrate Grafting for Osteonecrosis of the Femoral Head.

10. Corticoperiosteal Pedicle Flap of Greater Trochanter for Salvage of Old Femoral Neck Fracture in Children: Outcomes After a Minimum 5 Years Follow-up.

11. Third-Generation Ceramic-on-Ceramic Total Hip Arthroplasty in Patients with Osteonecrosis of the Femoral Head: A 10- to 16-year Follow-up Study.

12. Outcomes following Total Hip Arthroplasty for Femoral Head Osteonecrosis in Patients with History of Solid Organ Transplant.

13. Cementless Hip Arthroplasty in Patients with Subchondral Insufficiency Fracture of the Femoral Head.

14. Outcomes Following Total Hip Arthroplasty for Osteonecrosis of the Femoral Head in Patients on Hemodialysis.