Table 4 Patients features after division of patients in to two groups (A High FOA, B Normal/Low FOA)
Group A (High FOA) n = 19, |  | ||
|  | Mean (+/− SD) | ||
Age | 65.3 (+/−5.1) | ||
Sex | F:16, M:3 | ||
|  | Pre-Operative | Post-Operative (24 months of FU) | P value |
FOA | 12.2 (+/−0.9) | 9.5 (+/−1.7) | 0.002 |
PTA | 36.7 (+/− 4.6) | 22.7 (+/− 3.2) | 0.0054 |
ODI (%) | 56.4 (+/− 7.2) | 35.6 (+/− 6.8) | 0.0024 |
SRS 22 | 3.6 (+/− 0.5) | 2.5 (+/− 0.8) | < 0.05 |
VAS l | 8.6 (+/− 1.1) | 5.2 (+/− 1.4) | 0.007 |
VAS r | 7.2 (+/− 1.0) | 4.1 (+/−1.6) | 0.005 |
Biomechanics complications | 11 (57.9%) | Â | |
 SL | 3 (27.2%) |  | |
 PJK | 4 (36.4%) |  | |
 RF | 4 (36.4%) |  | |
Revision Surgery rate | 7 (36.8%) | Â | |
Group B (Normal/Low FOA) n = 24 | |||
|  | Mean (+/− SD) | ||
Age | 66.7 (+/− 6.3) | ||
Sex | F:18, M: 6 | ||
|  | Pre-Operative | Post-Operative (24 months of FU) | P value |
FOA | 8.2 (+/− 0.7) | 6.3 (+/− 1.1) | 0.023 |
PTA | 25.5 (+/−4.3) | 18.4 (+/− 2.2) | 0.0001 |
ODI (%) | 43.2 (+/− 4.5) | 23.2 (+/− 6.5) | 0.0049 |
SRS 22 | 2.7 (+/− 0.4) | 1.5 (+/− 0.3) | 0.0003 |
VAS l | 7.5 (+/−1.1) | 2.9 (+/− 0.8) | >  0.0001 |
VAS r | 7.3 (+/− 1.1) | 2.8 (+/−0.9) | > 0.0001 |
Biomechanics complications | 2 (8.3%) | Â | |
 SL | 1 (50%) |  | |
 PJK | 1 (50%) |  | |
 RF | _ |  | |
Revision Surgery rate | 1 (4.1%) | Â | |