How to evaluate the clinical outcome of joint-preserving treatment for osteonecrosis of the femoral head: development of a core outcome set

Table 3 Preliminary core outcomes and measurement methods

Outcome	Measurement
Pain	Visual analogue scale (VAS)
ROM of hip flexion	Degree of flexion
Walking distance	Meters of autonomous walking
Stable rating of X-ray images	Morphological change of the femoral head and density change in the necrotic area

ISSN: 1749-799X