Table 1.

Underlying diagnoses at the time of the primary THA

Underlying diagnosis	Number of patients
Primary osteoarthritis	36
Posttraumatic arthritis	2
Congenital dysplasia	6
Inflammatory arthritis	2
Osteonecrosis	3
Femoral neck fracture	2
Paget’s disease of bone	1
Little’s disease	1
Infection	1
Total	54