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 .
[Comparison of total hip arthroplasty via a posterior mini-incision versus a classic anterolateral approach].
Surgical approaches to the hip for total hip arthroplasty ( THA ) are termed minimally invasive when allowing for a skin incision length of 10 cm or less . The aim of this study was to explore if a minimally invasive posterior approach compared to a classic anterolateral approach negatively influenced surgical time , blood loss , implant position , or perioperative complications .  Two groups of THA patients mainly differing with respect to the surgical approach were compared . Results of 76 consecutive THA via a posterior mini-incision approach were recorded prospect ively and those of 76 controls operated via a classic anterolateral approach were recorded retrospectively .  THA was performed by the same surgeon in every case . Surgical time or intraoperative blood loss were not different among the groups . Total 24-h blood loss was significantly less in patients undergoing THA via minimally invasive posterior  approaches . Median cup inclination was 45 degrees in both groups . Cup anteversion was 15 degrees ( classic anterolateral ) and 12 degrees ( minimally invasive posterior ) , respectively . Stem position was regarded as neutral in 80 % of THA through classic anterolateral and in 76 % through minimally invasive dorsal incisions . Complications occurred in 8 % ( classic anterolateral ) and 9 % ( minimally invasive posterior ) of THA patients . Surgical time , blood loss , risk of malpositioned implants , or complications were not increased for THA patients operated through minimally invasive posterior incisions compared to those operated via classic anterolateral approaches
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 .