Table 3 Kinetics and kinematics of included studies

Mayr 2009 [16]

POD 6 week

Hip flexion, extension range increased

Maximum internal rotation of the hip in stance increased exclusively

DAA resulted in faster recovery of function at 6 weeks and 12 weeks postoperatively.

POD 12 week

Hip flexion at foot contact, maximum flexion in swing, ROM in sagittal and coronal planes, maximum adduction in stance

Hip flexion in foot contact, maximum flexion in swing, ROM in the transverse plane, maximum internal rotation in stance

Lugade 2010 [17]

POD 6 W, 16 W

Greater asymmetry in the ALA group compared with DAA group.

Both groups recovered gait symmetry at 16 weeks postoperatively, but DAA group recovered faster than DAA group at 6 weeks postoperatively.

Pospischill 2010 [18]

POD 10 days, 12 week

Despite absence of statistical significance, hip extension range decreased more than in ALA group

No significant difference between the two groups;

Patients after hip surgery adjusted their gait pattern to reduce the magnitude of loading on hip joint.

Queen 2011 [1]

POD 6 week

No difference in hip flexion at heel strike, peak hip flexion, peak hip abduction angle, or peak vertical ground reaction force

Muller 2012 [19]

POD 12 week

No effect of the surgical approach on the gait patterns or foot progression angle

Klausmeier 2010 [8]

POD 16 week

Better peak external rotation moment

No significant difference between the two groups

Paliery 2011 [22]

POD 4 week

Longer duration of swing phase, improved range of motion of hip, reduced adduction

Gait pattern after THA strictly dependent on the surgical access and mainly on the extent and location of the surgical damage.

POD 13 week

Better hip flexion, minor obliquity of pelvis

Better hip extension

Varin 2013 [24]

POD 10 months

Peak hip abduction moment reduced more than ALA group

DAA group showed closer to normal sagittal plane kinematics at the hip than the ALA group.

Factors other than surgical approach contributed more to difference between the two groups.

Wesseling 2016 [23]

POD 1 year

Hip Abduction moment reduced more than ALA group

Hip flexion moment reduced more than DAA group

No significant difference between the two groups;

Patients after hip surgery adjusted their motion pattern to decrease the magnitude of loading on the hip joint.

Queen 2014 [12]

POD 1 year

Decreased operative hip adduction moment

Increased adduction moment

No significant difference between the two groups

Martin 2011 [20]

POD 1 year

Heel interval during walking was greater with DAA group

Difference in terms of unoperated leg, while there is no difference between the two groups

Kiss 2012 [21]

POD 1 year

Gait pattern was almost normal

Hip motion reduced, pelvic rotation increased, increased compensation of knee and hip motion of unoperated leg

DAA yielded better functional outcome compared with ALA