Table 2.

Biomechanical changes of the pre-operative hip compared to those of the post-operative hip. Data presented as mean (SD, range)

Parameter	SHA (n = 50)	THA (n = 50)	p valuea
Horizontal femoral offset	+6.2 (±6.5, −6 to 24)	+2.0 (±6.1, -11 to 21)	0.001
Vertical femoral offset	+8.1 (±5.2, -1 to 26)	+8.8 (±5.9, -4 to 20)	0.53
Horizontal hip centre of rotation	−5.2 (±4.6, -16 to 6)	−3.5 (±4.9, -18 to 8)	0.22
Vertical hip centre of rotation	+0.2 (±3.3, -11 to 6)	−0.6 (±2.9, -8 to 7)	0.10
Abductor lever arm	−1.1 (±5.1, -11 to 9)	−0.4 (±6.7, -14 to 20)	0.58
Leg length	+8.0 (±6.2, -3 to 23)	+9.1 (±5.8, -4 to 20)	0.34

SD standard deviation, SHA short-stem hip arthroplasty, THA total hip arthroplasty

^a p value: SHA vs. THA