Total knee arthroplasty in Ranawat Ⅱ valgus deformity with enlarged femoral valgus cut angle:A new technique to achieve balanced gap  

作　　者：Shuai-Jie Lv Xiao-Jian Wang Jie-Feng Huang Qiang Mao Bang-Jian He Pei-Jian Tong 

机构地区：[1]Department of Orthopedics and Traumatology,The First Affiliated Hospital and First Clinical College of Zhejiang Chinese Medical University,Hangzhou 310006,Zhejiang Province,China [2]The First Clinical Medical School,Zhejiang Chinese Medical University,Hangzhou 310053,Zhejiang Province,China

出　　处：《World Journal of Clinical Cases》2022年第19期6406-6416,共11页世界临床病例杂志

基　　金：the Project of Excellent Young Talents of Traditional Chinese Medicine of Zhejiang Province,No.2019ZQ016;the Zhejiang Medical and Health Science and Technology Young Talents Program,No.2019RC059.

摘　　要：BACKGROUND Nearly 10%of patients undergoing primary total knee arthroplasty(TKA)have valgus deformity(VD)of the knee.For severe VD of the knee,a more lateral structural release is needed to achieve balance between medial and lateral space and neutral femorotibial mechanical axis(FTMA),which is challenging and technical.AIM To introduce a new surgical technique of resection,soft tissue release,and FTMA for Ranawat type-Ⅱ VD with a 5-year follow-up.METHODS A retrospective study was conducted on patients who underwent TKA from December 2011 to December 2014.Hip-knee-ankle(HKA),range of motion(ROM),Oxford knee score(OKS),and knee society score(KSS)were used to assess the joint activity of patients in the new theory TKA group(NT-TKA)and were compared with those of the conventional TKA group(C-TKA).RESULTS A total of 103 people(103 knees)were included in this study,including 42 patients with an average follow-up period of 83 mo in the C-TKA group and 61 patients with an average follow-up period of 76 mo in the NT-TKA group.Six patients had constrained prosthesis,one had common peroneal nerve injury,and two had joint instability in the C-TKA group,but none of these occurred in the NT-TKA group.There were significant statistical differences in constrained prosthesis usage and complications between the groups(P=0.002 and P=0.034,respectively).The KSS at 1 mo post-operation for the C-TKA and NT-TKA groups were 11.2±3.8 and 13.3±2.9,respectively,with a significant difference(P=0.007).However,the data of HKA,ROM,OKS KSS,and prosthesis survival rate were insignificant(P>0.05)in both the preoperative and follow-up periods.CONCLUSION Adopting 5°-7°valgus cut angle for VD and sacrificing 2°neutral FTMA for severe VD which cannot be completely corrected during TKA can reduce the need for soft tissue release,maintain early joint stability,reduce the use of constrained prostheses,and minimize postoperative complications.

关 键 词：Valgus knee ARTHROPLASTY OSTEOTOMY Mechanical axis Bone and soft-tissue balance 

分 类 号：R687.4[医药卫生—骨科学]