Exploratory analysis on a subgroup of patients using real
timed ultrasound to assess the size of gluteus medius in
the non affected side will be carried out. This subgroup
will be randomly selected from the main group following
initial randomisation. It is planned to compare the size of
the glut medius in the non affected side with the affected
side at week 12 and again at week 18. This data is
expected to also to be normally distributed and will be
assessed using t tests at the various time points. The
results of any subgroup analyses will be reported and submitted
for publication soon after the primary publication.