Table 3.

Postoperative comparison of MP and PS

Outcome	No. of studies	Cases (n)	Heterogeneity I2 (%)	Pooled odds Ratio	Mean difference	95% confidence interval	P value
ROM
6 months	3	362	0	NA	1.13	− 1.33 to 3.59	0.37
1 year	6	957	90	NA	3.55	− 1.19 to 8.30	0.14
2 years	4	382	94	NA	− 0.10	− 12.85 to 12.65	0.99
5 years	3	928	74	NA	− 1.51	− 4.97 to 1.96	0.39
ROM improvement	4	1097	41	NA	0.07	− 1.70 to 1.84	0.94
Flexion angle	6	824	90	NA	1.30	− 1.53 to 4.13	0.37
Extension angle	4	653	83	NA	0.36	− 0.61 to 1.34	0.47
KSS-Knee
1 year	3	260	0	NA	2.65	− 1.13 to 6.44	0.17
2 years	3	389	89	NA	− 0.46	− 6.19 to 5.27	0.88
5 years	2	401	73	NA	− 0.33	− 3.42 to 2.76	0.83
KSS-Function
1 year	3	260	0	NA	0.52	− 4.11 to 5.14	0.83
2 years	4	459	66	NA	− 1.10	− 3.89 to 1.69	0.44
5 years	2	401	32	NA	− 0.91	− 2.48 to 0.65	0.25
KSS-Total	3	453	76	NA	2.07	− 0.74 to 4.89	0.15
OKS	4	325	53	NA	0.17	− 0.62 to 0.95	0.68
WOMAC	6	904	64	NA	0.74	− 1.51 to 3.00	0.52
FJS	4	853	75	NA	5.15	− 2.46 to 12.77	0.18
Kujala Score	2	552	35	NA	1.35	0.52 to 2.18	0.001
Complications
Anterior knee pain	4	1226	11	0.78	NA	0.41 to 1.46	0.43
PCC	5	1265	0	0.20	NA	0.07 to 0.58	0.003
Deep infection	6	1628	0	1.61	NA	0.59 to 4.35	0.35
Instability	4	723	0	2.16	NA	0.63 to 7.35	0.22
Stiffness	4	631	0	0.78	NA	0.25 to 2.46	0.67
Overall	12	2279	59	1.07	NA	0.51 to 2.22	0.86
Revision rate	6	1484	0	1.44	NA	0.54 to 3.86	0.47
Patella shift	2	552	19	− 0.36	NA	− 0.71 to -0.00	0.05
Patella tilt	5	881	87	0.70	NA	− 0.42 to 1.81	0.22
Femorotibial angle	5	730	77	− 0.14	NA	− 0.72 to 0.44	0.63
Implant imposition
α angle	5	691	79	− 0.02	NA	− 0.64 to 0.59	0.94
β angle	5	691	0	0.03	NA	− 0.26 to 0.31	0.85
γ angle	5	691	62	0.39	NA	− 0.16 to 0.94	0.17
δ angle	5	691	97	0.28	NA	− 1.52 to 2.09	0.76

PCC patellar clunk or crepitus, α angle coronal femoral component angle, β angle coronal tibial component angle, γ angle sagittal femoral component angle, δ angle sagittal tibial component angle, NA not available