Table 1 A Xinqiao-proposed predictive algorithm to determine indicative level and feasibility for DAA by a cumulative score method
From: Direct anterior approach in total hip arthroplasty: more indications and advantages than we found
Indicator | Primary predictor | Second predictor | ||||||
 Obesity | 30<BMI<35 | +1 | 35<BMI<40 | +1 | BMI>40 | +2 | malnutrition | +0.5 |
WHR<0.85 (male) or<0.9 (female) | +1 | WHR>0.85 (male) Or > 0.9 (female) | +2 | - | - | dermatitis | +0.5 | |
 Pelvic Anatomy | DGT-AIIS/DFH>1.5 | 0 | 0.5<DGT-AIIS/DFH<1.0 | +1 | DGT-AIIS/DFH<0.0 | +2 | diabetes mellitus | +0.5 |
lateralized GT to ASIS | 0 | overlapped GT to ASIS | +1 | medialized GT to ASIS | +2 | hypothyroidism | +0.5 | |
PWmax/PWmin<2.0 | 0 | PWmax/PWmin >2.0 | +1 | PWmax/PWmin >2.5 | +2 | vascular insufficiency | +0.5 | |
iliac crest angle<65° | 0 | iliac crest angle<75° | +1 | iliac crest angle>75° | +2 | immunosuppression | +0.5 | |
 THA Complexity | primary regular | 0 | Primary complex or partial revision | +1 | total revision | +2 | chronic cardiopulmonary comorbidity | +0.5 |
 Surgeon’s Proficiency | DAA specialist (>1000 cases) | -1 | DAA professional (>500 cases) | 0 | DAA beginner (<100 cases) | +1 | previous surgery | +1 |
Indicative Level | ||||||||
 Cumulative Score | <3.5 | 3.5-6.0 | >6.0 | |||||
 Risk & Complication | Low | Medium | High | |||||
 Indicative Level | Strongly indicated | Fairly indicated | Conditionally indicated | |||||
 Surgical Recommendation | Standard DAA | Standard DAA + targeted soft tissue release + specific osteotomy | Extensile DAA + specific osteotomy + specific reconstruction | |||||