Table 1: Overview of the differences between the original DAA and its modification during implantation of the BHH geriatric patients [19].

	Direct Anterior Approach	Modified Direct Anterior Approach	Advantage
Draping	Both legs are draped flexibly	Only operating leg is draped flexibly	Better hygiene
Skin incision	Starts two finger breadths lateral and distal to the ASIS	Starts two finger breadths lateral to the ASIS	Better angle for femoral broaching
Retractor position	On ventral rim of acetabulum	Right into femoral head	No risk of breaking in the acetabulum
Corkscrew	Inserting in spongiosa bone	Inserting in cortical bone of the head	Easier removal of femoral head
Positioning retractor during femoral exposure	Cranial under greater trochanter	Lateral under greater trochanter	Lower risk of fracture of greater trochanter
Type of retractor	Sharp and blunt retractors can be used	Only blunt retractors should be used	Lower risk of breaking osteoporotic bone
Reduction of head in acetabulum	-	Place head first, attach conus on the stem and reduce afterwards	Lower risk of damage at ventral rim of the acetabulum