CT based PSI blocks for osteotomies around the knee provide accurate results when intraoperative imaging is used

Savov, Peter; Hold, Mara; Petri, Maximilian; Horstmann, Hauke; von Falck, Christian; Ettinger, Max

doi:10.1186/s40634-021-00357-8

Journal of Experimental Orthopaedics

Table 1 Fluoroscopic data of all patients with the preoperative and postoperative alignment as well as the planned parameter and the absolute deviation between the postoperative radiological outcome and the planned values

From: CT based PSI blocks for osteotomies around the knee provide accurate results when intraoperative imaging is used

ID			Preoperative			Planned			Postoperative			Absolut delta			Fluoroscopy
ID	HTO/DFO	Procedure	MPTA	LDFA	HKA	MPTA	LDFA	OLA	MPTA	LDFA	HKA	MPTA	LDFA	HKA	*cGycm**²	Pictures
1	HTO	OW	80.65	85.38	171	90		185	90.67	85.38	185	0.67		0	31.69	21
2	HTO	OW	85.29	89.69	173.31	90		180	89.3	89.69	179.97	0.7		0.03	52.8	12
3	HTO	OW	84.19	90.11	172.51	90		180	90.22	90.11	179.67	022		0.33	54.3	6
4	HTO	OW	84.44	92.81	174.11	90		180	90.01	92.81	179.28	0.01		0.72	26.9	18
5	HTO	OW	84.73	89.34	172.73	90		180	88.99	89.34	178.7	1.01		1.3	7.7	13
6	HTO	OW	85.16	93.35	170.28	91		180	93.28	93.35	179.83	2.28		0.17	24.91	19
7	HTO	OW	84.83	86.28	172.45	90		180	90.7	86.28	179.15	0.7		0.85	33	21
8	HTO	OW	85.66	91.35	168.43	90		179	89.1	91.35	177.25	0.9		1.75	12.93	9
9	HTO	OW	82.98	91.58	172.99	90		180	88.56	91.58	177.11	1.44		2.89	14.68	12
10	HTO	OW	80.32	89.7	169.6	88		180	88.64	89.7	179.25	0.64		0.75	13.41	16
11	HTO	OW	83.84	89	175.56	88		179	87.72	89	177.24	0.28		1.76	4,69	9
12	HTO + DFO	OW + CW	99.59	79.13	197.99	87	89	180	87.98	85.61	182.48	0.98	3.39	2.48	43	52
13	HTO + DFO	OW + CW	95.14	81.99	193.24	87	87	180	88.47	88.78	180.76	1.47	1.78	0.76	23.62	49
14	DFO	CW	89.42	80.31	189.16		88	180	89.42	87.98	177.05		0.02	2.95	53.19
15	DFO	CW	92.79	85.4	182.29		90	180	92.79	86.33	183.14		3.67	3.14	45.1	3
16	DFO	CW	90.11	82.43	187.29		90	180	90.11	87	182.92		3	2.92	117.1	2
17	DFO	CW	91.9	81.05	191.95		88	180	91.9	88.82	179.34		0.82	0.66	12.86	8
18	DFO	OW	89.96	83.13	172.24		90	180	89.96	90.9	176.66		0.9	3.34	33.8	37
19	DFO	OW	89.75	84.66	174.98		90	180	89.75	92.29	179.22		2.29	0.78	26.7	32
	Mean		87.41	86.67	178.01	89.31	89.00	180.2	89.87	89.28	179.7	0.86	1.98	1.45	33.28	18.83
	SD		4.89	4.35	8.96	1.3	1.19	1.21	1.51	2.42	2.31	0.60	1.33	1.16	24.89	14.28
	Min		80.32	79.13	168.43	87	87	179	87.72	85.38	176.7	0.01	0.02	0	4.69	2
	Max		99.59	93.35	197.99	91	90	185	93.28	93.35	185	2.28	3.67	3.34	117.1	52

HKA below 180° is defined as varus alignment
HKA hip-knee-ankle angle, MPTA media proximal tibial angle, LDFA lateral distal femoral angle, HTO high-tibial osteotomy, DFO distal femoral osteotomy, OW open wedge, CW closed wedge, SD standard deviation

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