Application value of 3D printed osteotomy guide plate assisted artificial total knee arthroplasty in severe genu varus deformity

ObjectiveTo investigate the application value of 3D printing osteotomy technology assisted artificial total knee arthroplasty(TKA) in severe genu varus deformity to improve the accuracy of clinical TKA.

MethodsThe clinical data of 42 patients with severe genu varus deformity were collected and analyzed.The patients were divided into two groups by random number table method.The 3D printing guide group(21 cases, 23 knees) were treated with 3D printed osteotomy guide plate assisted TKA, and the traditional surgical group were treated with traditional TKA.The operative time, intraoperative blood loss, 24 hours postoperative drainage, postoperative femoral and tibial mechanical shaft clamping angle(aMFTA) and knee joint KSS and WOMAC scores were recorded and statistically analyzed.

ResultsAll patients were successfully operated and followed up for 6 months.Compared with the traditional surgery group, the operation time was significantly shortened(P<0.01), and the intraoperative blood loss and 24 hours postoperative drainage volume were significantly reduced in the 3D printing guide group(P<0.01).The postoperative aMFTA in 3D printing guide group was lower than that in traditional surgery group(P<0.01).After 6 months of surgery, the clinical and functional scores of KSS in two groups were significantly higher than those before surgery(P<0.01), the functional score of KSS in 3D printing guide group was higher than that in traditional surgery group(P<0.05), but there was no statistical significance in the clinical score of KSS between two groups(P>0.05).Compared with that before surgery, the WOMAC scores in two groups after 3 and 6 months of surgery decreased with the increase of time(P<0.01).After 3 months of surgery, the score of 3D printing guide group was lower than that of the traditional surgery group (P<0.05).No postoperative complications such as infection, nerve injury, deep vein thrombosis, prosthesis loosening and dislocation occurred in two groups.

ConclusionsCompared with the traditional TKA surgery, the 3D printed osteotomy guide plate technology in the treatment of severe genu varus deformity has the advantages of shorter operation time, less blood loss, effective improving the surgical osteotomy accuracy, quick recovering the postoperative function and better clinical effects.