Table 3. Statistics of pre-operative and post-operative parameters (N=13).

	Age	Pre-op steps	Post-op steps	Pre-op gait velocity (m/s)	Post-op gate velocity (m/s)	Pre-op step length (m)	Post-op step length (m)	Posture score (pre)	Posture score (post)	Pre-op GPi	Post-op GPi	Pre-op ODI	Post-op ODI
Mean	69.15	2,638.46	4,615.38	0.8008	1.1185	0.5023	0.63	17.08	23.23	55.1754	75.9608	50.46	31.85
Std. error of mean	3.065	463.894	368.79	0.0915	0.07568	0.03249	0.0412	1.778	0.871	4.83755	3.07998	5.765	3.49
Std. deviation	11.052	1,672.592	1,329.691	0.32991	0.27288	0.11713	0.14855	6.409	3.14	17.44204	11.10504	20.787	12.582
Range	32	6500	4000	1.2	1.1	0.32	0.63	20	10	54.21	35	70	38
Minimum	51	500	3000	0.2	0.4	0.36	0.24	5	15	28.12	52.91	28	16
Maximum	83	7000	7000	1.4	1.5	0.68	0.87	25	25	82.33	87.91	98	54