Table 3

Instrument weights and costs per surgery for all four groups

Instrument typeWeight breakdown (kg)Total mean weight (kg)Cost breakdown (£)Total cost (£)
CVRSphere femoral finishing tray9.935.9424.12*424.12
Sphere conventional tray7.2
Sphere trial components10.6
General instruments and accessories tray8.2
CVSConventional Efficiency instrument set1.44.6110.00320.00
General Efficiency instrument set2.2110.00
Efficiency femoral set0.550.00
Efficiency insert set0.550.00
PSRMyKnee instruments12.533.7327.73†727.73
Conventional MyKnee instrument set10.1
Sphere trial components10.6
MyKnee cutting blocks0.5250.00 (+150.00‡)
PSSGeneral Efficiency instrument set2.23.7110.00610.00
Efficiency femoral set0.550.00
Efficiency insert set0.550.00
MyKnee cutting blocks0.5150.00
  • *Sterilisation cost for a single tray × 3.74 trays.

  • †Sterilisation cost for a single tray × 2.89 trays.

  • ‡Preoperative CT scan cost.

  • CVR, conventional/reusable; CVS, conventional/single use; PSR, patient specific/reusable; PSS, patient specific/single use.