Table 6.
Quality assessment of the grade of evidence of the observational studies comparing TKA with – and without prior HTO
| Quality assessment | Summary of findings | ||||||||
| No of knees | Effects | ||||||||
| No of studies | Design | Quality | Consistency | Directness | HTO | no HTO | Quality | Importance | |
| Range of motion (6) | |||||||||
| observational | no serious limitations | no important inconsistency | direct | 251 | 251 | 4/6 studies no difference | low | critical | |
| Knee clinical scores (9) | |||||||||
| observational | no serious limitations | no important inconsistency | direct | low | critical | ||||
| HSS (5/9) | 212 | 212 | 5/5 studies no difference | ||||||
| KSS (5/9) | 175 | 176 | 4/5 study no difference | ||||||
| other (3/9) | 106 | 105 | 2/3 studies no difference | ||||||
| Revision surgery because of (a)septic loosening (8) | |||||||||
| observational | no serious limitations | no important inconsistency | direct | 298 | 296 | 8/8 studies no difference | low | critical | |