| Study Author | Origin / Year | Study Population | Outcome and results |
|---|---|---|---|
|
PATIENT FACTORS Mental Impairment and Neurological conditions |
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| Coughlin et al [8] | Canada, 1980 | 49 HAs in 47 patients with Parkinson’s disease/stroke | 37% dislocation rate |
| Ninh et al [9] | USA, 2009 | 144 patients undergoing HA at 1 year post op | 54% dislocation rate with mental impairment |
| Salem et al [10] | UK, 2014 | 3,525 HAs over 11 years | No correlation with mental impairment |
| Staeheli et al [11] | USA, 1988 | 49 patients with Parkinson’s disease undergoing HA | 1% dislocation rate |
|
SURGEON FACTORS Surgical experience |
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| Enocson et al [12] | Sweden, 2008 | 720 HAs in 739 patients | No correlation between grades and dislocation |
| Unwin et al [13] | UK, 1994 | 2906 patients undergoing HA | Increased dislocation for junior grade only when using posterior approach |
| Salem et al [10] | UK, 2014 | 3,525 HAs over 11 years | No correlation between grades and dislocation |
|
SURGICAL FACTORS Implant fixation |
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| Langslet et al [17] |
Norway, 2014 | RCT: 112 cemented vs 108 uncemented | No correlation between fixation and dislocation |
| Deangelis et al [18] | USA, 2012 | RCT: 274 HAs in 269 patients | No correlation between fixation and dislocation |
| Figved et al [19] | Norway, 2009 | RCT: 112 cemented vs 108 over 5 years | No correlation between fixation and dislocation |
| Weinrauch et al [20] | Australia, 2006 | 1118 Austin Moore vs Thompson over 6 years | No correlation between fixation and dislocation |
| Varley et al [21] | UK, 2004 | 81 papers reviewed – 6,863 uncemented vs 4,322 cemented | No correlation between fixation and dislocation |
| Unipolar vs Bipolar | |||
| Enocson et al [26] | Sweden, 2012 | 427 unipolar vs 403 bipolar | No correlation between articulation and dislocation |
| Calder et al [28] | UK, 1996 | RCT: 118 Monk vs 132 Thompson HAs | No correlation between articulation and dislocation |
| Davison et al [29] | UK, 2001 | RCT: 90 Thompson vs 97 Monk HAs | No correlation between articulation and dislocation |
| Raia et al [30] | USA, 2003 | RCT: 60 unipolar vs 55 bipolar | No correlation between articulation and dislocation |
| Ong et al [31] | USA, 2002 | 101 bipolar vs 180 unipolar HAs | No correlation between articulation and dislocation |
| Paton et al [32] | UK, 1989 | 108 unipolar vs 63 bipolar HAs | No correlation between articulation and dislocation |
| Kanto et al [33] | Finland, 2014 | 88 unipolar vs 87 bipolar RCT at 5 year follow up | Significant unipolar dislocation rate |
| Anterolateral vs posterior approach | |||
| Paton et al [32] | UK, 1989 | 78 lateral vs 93 posterior HAs | Not statistically significant |
| Keene et al [36] | UK, 1993 | 302 anterolateral vs 229 posterior HAs | Increased dislocation with posterior approach |
| Unwin et al [13] | UK, 1994 | 2150 anterolateral vs 1656 posterior HAs | Increased dislocation with posterior approach – 3.3 vs 9% |
| Pajarinen et al [37] | Finland, 2003 | 338 patients undergoing HA | Increased dislocation with posterior approach |
| Bush et al [38] | USA, 2007 | 375 patients undergoing HA | Increased dislocation with posterior approach – 0 vs 4.5% |
| Biber et al [39] | Germany, 2012 | 217 anterolateral vs 487 posterior HAs | Increased dislocation with posterior approach – 0.5 vs 3.9% |
| Abram et al [40] | UK, 2015 | 753 anterolateral vs 54 posterior HAs | Increased dislocation with posterior approach – 2.1 vs 13% |
| Enocson et al [12] | Sweden, 2008 | 431 anterolateral vs 305 posterior HAs | Increased dislocation with posterior approach – 3% vs 8.5/13% (repair/no repair) |
| Varley et al [41] | UK, 2004 | 84 papers reviewed – 6,026 anterolateral vs 7,912 posterior HAs | Increased dislocation with posterior approach – 2.4 vs 5.1% |
| Rogmark et al [42] | Sweden, 2014 | 21,206 anterolateral vs 11,999 posterior HAs | Increased dislocation with posterior approach |
| Sierra et al [43] | USA, 2006 | 1558 anterolateral/lateral vs 254 posterior HAs over 27 years | No difference in cumulative probabilities at 1, 5, 10 and 20 years |
| Capsular repair vs capsulectomy | |||
| Hughes et al [46] | UK, 2015 | Cadaveric study of 10 hips | Increased stability with capsular repair |
| Stem type | |||
| Bidwai et al [47] | UK, 2012 | 766 Thompson vs 388 Exeter trauma stem | No difference between stem types |
|
OTHER FACTORS Previous failed surgery |
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| Roberts et al [48] | UK, 2002 | 100 HA as revision procedure vs 730 primary HAs | Increased dislocation rate following previous failed surgery – 0.8 vs 4% |
| Enocson et al [12] | Sweden, 2008 | 720 HAs in 739 patients | No correlation between dislocation rate and previous failed surgery |
| Delayed surgery | |||
| Salem et al [10] | UK, 2014 | 3,525 patients undergoing HA over 11 years | 4-fold increase with 24 hours delay/10-fold with 36 hour delay |
| Madanat et al [50] | Finland, 2012 | 602 patients undergoing HA | Significant risk of dislocation over 48 hours |
| Radiographical/anatomical factors | |||
| Ninh et al [9] | USA, 2009 | 144 patients undergoing HA at 1 year post op | Higher dislocations rate with decreased femoral offset and CEA |
| Madanat et al [50] | Finland, 2012 | 602 patients undergoing HA | Higher dislocation rate with decreased femoral offset and decreased CEA |