Comparison of Clinical and Radiological Outcomes between Calibratable Patient-Specific Instrumentation and Conventional Operation for Medial Open-Wedge High Tibial Osteotomy: A Randomized Controlled Trial

Table 2

Comparison of imaging data.

	PSI group; ()	CO group; ()	^2 value
WBL (weight-bearing line) ratio (%)
(i) Preop target			0.868
(ii) Postop value			0.234
(iii) ^1 value	0.063	0.017	—
(iv) Absolute difference from designed target			0.002
HKA (hip-knee-ankle angle) (°)
(i) Preop target			0.765
(ii) Postop value			0.085
(iii) ^1 value	0.038	0.003	—
(iv) Absolute difference from designed target			0.018
MPTA (medial proximal tibial angle) (°)
(i) Preop target			0.072
(ii) Postop value			0.165
(iii) ^1 value	0.917	0.503	—
(iv) Absolute difference from designed target			0.068
Correction angle (°)
(i) Preop target			0.907
(ii) Postop value			0.868
(iii) ^1 value	0.182	0.072	—
(iv) Absolute difference from designed target			0.912
PTSA (posterior tibial slope angle) (°)
(i) Preop value			0.062
(ii) Postop value			0.866
(iii) ^1 value	0.969	0.043	—
(iv) Absolute difference from preop values			0.244
Insall–Salvati index
(i) Preop value			0.453
(ii) Postop value			0.271
(iii) ^1 value	0.449	0.134	—

(PSI: patient-specific instrumentation. CO: conventional operation. Preop: preoperative. Postop: postoperative. ¹, using paired test. P²: using two-sample test).