Table 5.
Comparison of outlier rates for postoperative HKA axis and component alignment between our study and studies in the literature published from 2007 to 2012 and having a minimum of 100 computer-assisted TKAs
| Study | Year | Study design | Navigation system | Number of TKAs | Outliers for postoperative HKA axis (%) | Outliers for femoral component alignment (%) | Outliers for tibial component alignment (%) | Minimum followup (months) |
|---|---|---|---|---|---|---|---|---|
| Anderson et al. [2] | 2005 | Retrospective, matched-pair case-control study, single surgeon | OrthoPilot® (Stryker Orthopaedics, Mahwah, NJ, USA) | 116 | 5 | NA | NA | NA |
| Haaker et al. [8] | 2005 | Retrospective, matched-pair case-control, 4 surgeons | OrthoPilot® (Stryker) | 100 | 21 | NA | NA | NA |
| Jenny et al. [10] | 2005 | Retrospective, matched-pair case-control study, 2 surgeons | OrthoPilot® (Stryker) | 235 | 8 | 11 | 11 | 3 |
| Mullaji et al. [17] | 2007 | RCT, single surgeon | Ci (Brainlab AG, Munich, Germany) | 282 | 9 | 9 | 9 | 12 |
| Martin et al. [14] | 2007 | RCT, 3 surgeons | VectorVision® (Brainlab) | 100 | 6 | 5 | 3 | 3 |
| Tingart et al. [26] | 2008 | Prospective | VectorVision® (Brainlab) and Ci™ System (DePuy Orthopaedics Inc, Warsaw, IN, USA) | 500 | 5 | 4 | 5 | NA |
| Kim et al. [11] | 2009 | Prospective, single surgeon in sequential bilateral TKAs | VectorVision® (Brainlab) | 160 | 13 | 11 | 9 | 36 |
| Current study | 2012 | Retrospective, single surgeon | Ci (Brainlab) | 1500 | 7 | 7 | 8 | 12 |
HKA = hip-knee-ankle; RCT = randomized controlled trial; NA = not available.