Soft tissue balance measurement in minimal incisio

Authors: Tomoyuki Matsumoto Hirotsugu Muratsu Seiji Kubo Kiyonori Mizuno Keisuke Kinoshita Kazunari Ishida Takehiko Matsushita Ken Sasaki Katsumasa Tei Koji Takayama Hiroshi Sasaki Shinya Oka Masahiro Kurosaka Ryosuke Kuroda

Publish Date: 2010/08/03

Volume: 19, Issue: 6, Pages: 880-886

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Abstract

Minimal incision surgery MIS total knee arthroplasty TKA is widely promoted as a possible improvement over conventional TKA and accurate implantations have recently been reported using navigation systems However soft tissue balance during MISTKA remains challenging Therefore in this report joint gap component gap and ligament balance varus angle were assessed during MISTKA using a tensor which enables soft tissue balance assessment with a reduced patellofemoral joint and femoral component in placeResults were compared to those of conventional TKA Posterior stabilized TKA were performed in 50 knees 25 knees MISTKA using quadricepssparing approach 25 knees conventional TKA using medial parapatellar approach with varus osteoarthritis Component gap and varus angle were measured using the tensor with a reduced patellofemoral joint at 0 10 45 90 and 135°Whereas the component gap in MISTKA was significantly larger through the entire arc of flexion compared with conventional TKA the pattern of joint looseness showed no difference between the two procedures The varus angle in MISTKA was significantly larger than that in conventional TKA at 0 90 and 135° of knee flexionMISTKA may lead to ligament imbalance due to the difficulties induced by a limited working space Understanding this pattern allows surgeons to be able to adjust the soft tissue balance more accurately and thereby expect a better postoperative outcome even in MISTKA

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