Strong evidence was found for a decrease in operative time and intraoperative blood loss for MIS THA , with no difference in complication rates and risk for acetabular outliers .
Strong evidence exists that there is no difference in physical functioning , measured either by question naires or by gait analysis .
Moderate evidence was found for a shorter length of hospital stay after MIS THA .
Conflicting evidence was found for a positive effect of MIS THA on pain in the early postoperative period , but that effect diminished after three months postoperatively .
Strong evidence was found for an increase in operative time for CAS THA , and limited evidence was found for a decrease in intraoperative blood loss .
Furthermore , strong evidence was found for no difference in complication rates , as well as for a significantly lower risk for acetabular outliers .
Conclusions The results indicate that MIS THA is a safe surgical procedure , without increases in operative time , blood loss , operative complication rates and component malposition rates .
However , the beneficial effect of MIS THA on functional recovery has to be proven .
The results also indicate that CAS THA , though result ing in an increase in operative time , may have a positive effect on operative blood loss and operative complication rates .
More importantly , the use of CAS results in better positioning of acetabular component of the prosthesis
Background Both minimally invasive surgery ( MIS ) and computer-assisted surgery ( CAS ) for total hip arthroplasty ( THA ) have gained popularity in recent years .
We conducted a qualitative and systematic review to assess the effectiveness of MIS , CAS and computer-assisted MIS for THA .
The effect of total hip arthroplasty surgical approach on gait.
This study examined the effect of the surgical approach used in  total hip arthroplasty ( THA )  on gait mechanics six months following surgery . Quantitative gait analysis was performed on 29 subjects : 10 anterolateral ( A-L ) and 10 posterolateral ( P-L ) THA patients and nine able-bodied , velocity-matched subjects . Discriminant function analysis was used to determine the distinction of the groups with respect to sagittal plane hip range of motion , index of symmetry , trunk inclination , pelvic drop , hip abduction , and foot progression angles . The A-L group had the largest trunk inclination ( 3.0+/-2.4 degrees ) and the smallest hip range of motion ( 34.0+/-7.4 degrees ) . Both THA groups demonstrated greater asymmetry as expressed by the smaller symmetry index ( 0.97+/-0.04 for A-L and 0.98+/-0.05 for the P-L ) than the able-bodied group ( 0.99+/-0.01 ) . The classification procedure correctly classified 89 % of the control group cases , 90 % of the A-L cases , and 50 % of the P-L cases . These results support the conclusion that six months following surgery , the gait of the majority ( 85 % ) of THA patients has not returned to normal . The A-L patients displayed distinct gait patterns , while a small percentage ( 30 % ) of the P-L patients demonstrated normal gait . While these differences are statistically significant , the clinical significance is unknown and linked to the duration that they persist
Strong evidence was found for a decrease in operative time and intraoperative blood loss for MIS THA , with no difference in complication rates and risk for acetabular outliers .
Strong evidence exists that there is no difference in physical functioning , measured either by question naires or by gait analysis .
Moderate evidence was found for a shorter length of hospital stay after MIS THA .
Conflicting evidence was found for a positive effect of MIS THA on pain in the early postoperative period , but that effect diminished after three months postoperatively .
Strong evidence was found for an increase in operative time for CAS THA , and limited evidence was found for a decrease in intraoperative blood loss .
Furthermore , strong evidence was found for no difference in complication rates , as well as for a significantly lower risk for acetabular outliers .
Conclusions The results indicate that MIS THA is a safe surgical procedure , without increases in operative time , blood loss , operative complication rates and component malposition rates .
However , the beneficial effect of MIS THA on functional recovery has to be proven .
The results also indicate that CAS THA , though result ing in an increase in operative time , may have a positive effect on operative blood loss and operative complication rates .
More importantly , the use of CAS results in better positioning of acetabular component of the prosthesis
Background Both minimally invasive surgery ( MIS ) and computer-assisted surgery ( CAS ) for total hip arthroplasty ( THA ) have gained popularity in recent years .
We conducted a qualitative and systematic review to assess the effectiveness of MIS , CAS and computer-assisted MIS for THA .