Table 3 Studies comparing N-THA vs. C-THA
Author | Study Type / Number of Patients | Study Group 1 | Study Group 2 | Outcome / Follow-up | Results |
|---|---|---|---|---|---|
Jacob I et al., [13] | Case-Control study / 102 hips | N-THA | C-THA | Radiographs were evaluated for cup placement within safe zones (Lewinnek). | Cup inclination and anteversion were more consistent in N-THA group. |
Naito Y et al., [14] | Case-Control study / 184 hips | N-THA | C-THA | CT scans were evaluated for cup placement within safe zones(Lewinnek). Complications were followed up. | Significantly higher percentage of acetabular cups were within safe zones using N-THA. But no difference was found in incidence of hip dislocation. |
Tanino H et al., [37] | Prospective RCT / 110 hips | N-THA | C-THA | Radiographs were evaluated for cup placement within safe zones (Lewinnek). | Significantly higher percentage of acetabular cups were within safe zones using N-THA. But there was statistically significant increase in average operative time with N-THA. |
Nishihara S et al., [38] | Case-Control study / 144 hips | N-THA | C-THA | CT scans were evaluated for cup placement within safe zones. Dislocations within 6 months of postoperative period were noted. | N-THA had less number of cases outside the targeted zone. One case in C-THA group developed posterior dislocation. |
Takada R et al., [39] | Comparative study / 30 hips | Navigation assessment | Manual Goniometer Assessment | Evaluation using CT scan at 3 months for the absolute error in inclination and anteversion measured using navigation or goniometer intraoperatively. | Absolute estimate error of cup anteversion in navigation measurement was significantly lower than in goniometer measurement. |
Okamoto M et al., [42] | Case-Control study / 221 hips | N-THA | Alignment Guide THA | CT scans were evaluated for cup placement within safe zones(Lewinnek). Functional outcome was evaluated. | Anteversion errors were less in N-THA group. No significant differences in functional outcomes was found. |
Mihalic R et al., [40] | Prospective RCT / 84 hips | N-THA | C-THA | CT scans were evaluated for cup placement within safe zones(Lewinnek). | Less number of outliers from safe zone in N-THA group and significantly higher accuracy for anteversion was noted using N-THA. |
Ogawa H et al., [16] | Prospective RCT / 41 hips | N-THA | C-THA | Radiographs and CT scans were evaluated for cup placement within safe zones (Lewinnek). | No significant differences were found in component placement using either methods. |
Lass R et al., [41] | Prospective RCT / 110 hips | N-THA | C-THA | Radiographs were evaluated for cup placement at 6 weeks followup. Functional outcomes were evaluated for up to 2 years. | Significant difference in mean anteversion but no difference was noted in mean inclination. No difference in functional outcomes was found. |