| Excluded (N) | Included (N) |
---|---|---|
Invited to participate: | Â | 262 |
 Declined | 17 |  |
 Excluded |  |  |
  Unable to provide informed consent | 4 |  |
  Co-existing condition limiting walking | 6 |  |
 Withdrew consent | 2 |  |
Completed pre-operative OM’s and activity monitoring: | 233a | |
 Lost/faulty monitor | 27 |  |
 Incomplete monitoring period | 16 |  |
 Incomplete outcome measures | 19 |  |
Data sets available for multivariable analysis: | 171 | |
Included in multivariable analysisb: | ||
 ODQ | 14 | 157 |
 SF-36 (PCS) | 17 | 154 |
 Back pain | n/a | n/a |
 Leg pain | 18 | 196c |