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Table 2 Pearson correlation of demographic and outcome criteria (* = 0.05 ** = 0.01 *** = 0.001)

From: Influence of surgical approach on heterotopic ossification after total hip arthroplasty – is minimal invasive better? A case control study

Pearson r N STD-Watson-Jones STD-Bauer AMIS MIS-AL MIS Revision surgery HO Gender Age Previous THA
STD-Watson-Jones 134 1*** −0.35*** −0.43*** −0.32*** −0.65*** −0.03 0.22** 0.02 0.03 0
STD-Bauer 134 −0.35*** 1*** −0.33*** −0.25** −0.49*** 0.03 −0.12 −0.06 0.01 0.1
AMIS 134 −0.43*** −0.33*** 1*** −0.31*** 0.67*** −0.09 −0.08 −0.06 0.07 −0.04
MIS-AL 134 −0.32*** −0.25** −0.31*** 1*** 0.5*** 0.12 −0.04 0.11 −0.12 −0.06
MIS 134 −0.65*** −0.49*** 0.67*** 0.5*** 1*** 0.01 −0.11 0.03 −0.03 −0.08
Revision surgery 134 −0.03 0.03 −0.09 0.12 0.01 1*** 0.04 0.13 0.11 0.02
HO 134 0.22** −0.12 −0.08 −0.04 −0.11 0.04 1*** 0.11 0.14 0.16
Gender 134 0.02 −0.06 −0.06 0.11 0.03 0.13 0.11 1*** 0.02 0.04
Age 134 0.03 0.01 0.07 −0.12 −0.03 0.11 0.14 0.02 1*** −0.07
Previous THA 134 0 0.1 −0.04 −0.06 −0.08 0.02 0.16 0.04 −0.07 1***
Diabetes 134 −0.08 0.02 0.03 0.05 0.06 −0.03 −0.05 0.09 0.09 −0.02
Cardiovascular diseases 134 0.01 −0.03 0 0.03 0.02 0.16 0.03 −0.24** 0.48*** −0.18*
Osteoporosis 134 0.11 −0.08 −0.12 0.08 −0.04 0.05 0.22* 0.24** 0.05 0.1
Hospital stay 134 0.13 0.04 −0.24** 0.09 −0.15 0.39*** 0.17 0.2* 0.22* 0.12
Intraoperative complications 134 0.1 0.1 −0.09 −0.12 −0.18* 0.2* 0.07 0.13 0.16 0.02
Bleeding 134 0.01 0.17* −0.1 −0.07 −0.14 −0.04 −0.08 0.05 0.03 0
Wound healing problems/ infections 134 0.05 −0.08 −0.12 0.16 0.01 0.41*** 0.03 0.07 −0.06 −0.02
Cardiovascular events 134 −0.07 −0.02 0.18* −0.1 0.08 0.1 −0.02 0.01 0.04 −0.15
Pulmonary embolism 134 −0.06 −0.04 0.14 −0.04 0.09 −0.02 −0.05 −0.08 0.05 0.12
Postoperative anemia 134 0.15 −0.05 −0.04 −0.07 −0.1 0.21* 0.06 0.17* 0.1 0
Urinary tract infections 134 0.24** −0.02 −0.14 −0.1 −0.21* 0.1 0.15 0.15 0.07 0
Other neurological deficits/delirium 134 −0.01 0.13 −0.12 0.01 −0.1 −0.07 −0.07 −0.05 0.18* 0.04
Fractures 134 0.09 −0.02 −0.06 −0.01 −0.06 0.25** 0.19* 0.15 0.24** 0.08
Dislocation 134 −0.1 0.17* 0.01 −0.07 −0.04 0.17* 0.01 0.05 0.09 −0.11
Loosening 134 0.13 −0.04 −0.06 −0.04 −0.08 0.34*** 0.12 −0.08 0 −0.06
Leg length discrepancy 134 −0.11 0.03 0.1 −0.01 0.08 −0.09 −0.1 0 −0.03 −0.04
Trendelenburg sign/muscular deficits 134 0.09 0.23** −0.18* −0.13 −0.27** 0.04 0.07 0.07 0.06 0.07
Local sensory disturbances/pain 134 −0.06 −0.03 0.05 0.05 0.08 0.19* 0.1 0.03 −0.12 0
Pearson r N Diabetes Cardiovasc. diseases Osteoporosis Hospital stay Intraoperative complications Bleeding Wound healing problems/infections Cardiovascular events Pulmonary embolism Postoperative anemia
STD-Watson-Jones 134 −0.08 0.01 0.11 0.13 0.1 0.01 0.05 −0.07 −0.06 0.15
STD-Bauer 134 0.02 −0.03 −0.08 0.04 0.1 0.17* −0.08 −0.02 −0.04 −0.05
AMIS 134 0.03 0 −0.12 −0.24** −0.09 −0.1 −0.12 0.18* 0.14 −0.04
MIS-AL 134 0.05 0.03 0.08 0.09 −0.12 −0.07 0.16 −0.1 −0.04 −0.07
MIS 134 0.06 0.02 −0.04 −0.15 −0.18* −0.14 0.01 0.08 0.09 −0.1
Revision surgery 134 −0.03 0.16 0.05 0.39*** 0.2* −0.04 0.41*** 0.1 −0.02 0.21*
HO 134 −0.05 0.03 0.22* 0.17 0.07 −0.08 0.03 −0.02 −0.05 0.06
Gender 134 0.09 −0.24** 0.24** 0.2* 0.13 0.05 0.07 0.01 −0.08 0.17*
Age 134 0.09 0.48*** 0.05 0.22* 0.16 0.03 −0.06 0.04 0.05 0.1
Previous THA 134 −0.02 −0.18* 0.1 0.12 0.02 0 −0.02 −0.15 0.12 0
Diabetes 134 1*** 0.27** 0.03 −0.03 −0.03 −0.07 −0.05 0 0.2* 0.16
Cardiovasc. diseases 134 0.27** 1*** −0.15 0.1 0.09 0.03 0.08 −0.03 0.08 0.17*
Osteoporosis 134 0.03 −0.15 1*** 0.12 0.05 −0.04 0.03 −0.06 −0.02 0.02
Hospital stay 134 −0.03 0.1 0.12 1*** 0.19* 0.15 0.29*** −0.06 −0.07 0.12
Intraoperative complications 134 −0.03 0.09 0.05 0.19* 1*** 0.39*** 0.17 −0.05 −0.02 0.29***
Bleeding 134 −0.07 0.03 −0.04 0.15 0.39*** 1*** −0.04 −0.03 −0.01 0.06
Wound healing problems/ infections 134 −0.05 0.08 0.03 0.29*** 0.17 −0.04 1*** −0.06 −0.02 0.16
Cardiovasc. events 134 0 −0.03 −0.06 −0.06 −0.05 −0.03 −0.06 1*** −0.02 −0.1
Pulmonary embolism 134 0.2* 0.08 −0.02 −0.07 −0.02 −0.01 −0.02 −0.02 1*** 0.19*
Postoperative anemia 134 0.16 0.17* 0.02 0.12 0.29*** 0.06 0.16 −0.1 0.19* 1***
Urinary tract infections 134 0.1 0.04 0.08 0.12 0.1 −0.03 0.35*** −0.05 −0.02 0.18*
Other neurological deficits/delirium 134 −0.05 0.02 0.14 0.1 0.05 0.15 −0.08 −0.06 −0.02 0.09
Fractures 134 0.06 0.16 0.06 0.33*** 0.58*** 0.32*** 0.52*** 0.12 0.15 0.67***
Dislocation 134 0 0.12 0.08 0.21* 0.55*** −0.03 0.21* −0.05 −0.02 0.28**
Loosening 134 −0.07 0.13 −0.04 −0.04 0.17* 0.32*** 0.15 −0.03 −0.01 0.06
Leg length discrepancy 134 −0.04 0.08 −0.02 −0.02 −0.02 −0.01 −0.02 −0.02 −0.01 0.19*
Trendelenburg sign/muscular deficits 134 −0.02 −0.07 −0.12 −0.15 −0.02 0.01 0.07 0.18* 0.14 0.04
Local sensory disturbances/pain 134 −0.06 −0.01 0.16 0.07 0.04 0.06 0.01 −0.01 −0.04 0.08
Pearson r N Urinary tract infections Other neurological Deficits/delirium Fractures Dislocation Loosening Leg length discrepancy Trendelenburg sign/muscular deficits Local sensory disturbances/pain   
STD-Watson-Jones 134 0.24** −0.01 0.09 −0.1 0.13 −0.11 0.09 −0.06   
STD-Bauer 134 −0.02 0.13 −0.02 0.17* −0.04 0.03 0.23** −0.03   
AMIS 134 −0.14 −0.12 −0.06 0.01 −0.06 0.1 −0.18* 0.05   
MIS-AL 134 −0.1 0.01 −0.01 −0.07 −0.04 −0.01 −0.13 0.05   
MIS 134 −0.21* −0.16 −0.06 −0.04 −0.08 0.08 −0.27** 0.08   
Revision surgery 134 0.1 0.36*** 0.25** 0.17* 0.34*** −0.09 0.04 0.19*   
HO 134 0.15 0.04 0.19* 0.01 0.12 −0.1 0.07 0.1   
Gender 134 0.15 0.17* 0.15 0.05 −0.08 0 0.07 0.03   
Age 134 0.07 0.16 0.24** 0.09 0 −0.03 0.06 −0.12   
Previous THA 134 0 −0.01 0.08 −0.11 −0.06 −0.04 0.07 0   
Diabetes 134 0.1 0.06 0 −0.07 −0.04 −0.02 −0.06 −0.02   
Cardiovasc. diseases 134 0.04 0.16 0.12 0.13 0.08 −0.07 −0.01 −0.05   
Osteoporosis 134 0.08 0.06 0.08 −0.04 −0.02 −0.12 0.16 −0.07   
Hospital stay 134 0.12 0.33*** 0.21* −0.04 −0.02 −0.15 0.07 −0.09   
Intraoperative complications 134 0.1 0.58*** 0.55*** 0.17* −0.02 −0.02 0.04 0.03   
Bleeding 134 −0.03 0.32*** −0.03 0.32*** −0.01 0.01 0.06 −0.08   
Wound healing problems/infections 134 0.35*** 0.52*** 0.21* 0.15 −0.02 0.07 0.01 0.14   
Cardiovascular events 134 −0.05 0.12 −0.05 −0.03 −0.02 0.18* −0.01 0.07   
Pulmonary embolism 134 −0.02 0.15 −0.02 −0.01 −0.01 0.14 −0.04 −0.04   
Postoperative anemia 134 0.18* 0.67*** 0.28** 0.06 0.19* 0.04 0.08 0.01   
Urinary tract infection 134 1*** 0.5*** 0.3*** −0.03 −0.02 0.1 0.08 0.16   
Other neurological deficits/delirium 134 0.21* 0.39*** −0.06 −0.04 −0.02 −0.06 0.01 −0.07   
Fractures 134 0.5*** 1*** 0.37*** 0.2* 0.05 0.11 0.07 0.08   
Dislocation 134 0.3*** 0.37*** 1*** −0.03 −0.02 −0.06 0.17* 0.07   
Loosening 134 −0.03 0.2* −0.03 1*** −0.01 0.13 0.06 0.18*   
Leg length discrepancy 134 −0.02 0.05 −0.02 −0.01 1*** −0.06 −0.04 0.17*   
Trendelenburg sign/muscular deficits 134 0.1 0.11 −0.06 0.13 −0.06 1*** 0.03 0.05   
Local sensory disturbances/pain 134 0.08 0.07 0.17* 0.06 −0.04 0.03 1*** −0.05