Effect of flexion angle on coronal laxity in patients with mobile-bearing total knee arthroplasty prostheses

被引:24
作者
Matsuda, Y [1 ]
Ishii, Y [1 ]
Noguchi, H [1 ]
Ishii, R [1 ]
机构
[1] Ishii Orthopaed & Rehabil Clin, Gyodo 3610037, Japan
关键词
coronal laxity; total knee arthroplasty; posterior cruciate ligament retaining; posterior cruciate ligament sacrificing; flexion angle;
D O I
10.1007/s00776-004-0863-7
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Proper soft tissue tension is one of the important factors in mobile-bearing total knee arthroplasty (TKA). We evaluated varus/valgus laxities, particularly at flexion, which is a key factor in reducing the risk of subluxation and dislocation of bearings to assess the effect that the flexion angle and the presence or absence of the posterior cruciate ligament (PCL) have on laxity in patients with low-contact stress (LCS) prostheses of the PCL-retaining (24 patients, 24 knees) and PCL-sacrificing (24 patients, 24 knees) type designs during extension and flexion. Both types of prosthesis had about 4degrees laxity at extension and 3degrees at flexion. PCL-retaining prostheses had significantly less laxity at flexion than at extension (P = 0.0004 in varus, P = 0.0043 in valgus). For good clinical outcomes following TKA, 3degrees-4degrees laxity in the varus and valgus orientations is recommended. In addition, the PCL might be involved in flexion and could affect varus/valgus laxity in PCL-retaining prostheses.
引用
收藏
页码:37 / 41
页数:5
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