Table 9

 Croft’s measurement of the minimal joint space (lateral, superior, axial, medial)

GradeDescription
Minimal joint space is the shortest distance on the radiograph between the femoral head margin and the acetabular edge.
0MJS >2.5 mm
1MJS >1.5 mm and ⩽2.5 mm
2MJS ⩽1.5 mm