Effect of soft tissue tension on measurements of coronal laxity in mobile-bearing total knee arthroplasty |
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Authors: | Yoshinori Ishii Yoshikazu Matsuda Hideo Noguchi Hiroshi Kiga |
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Institution: | (1) Ishii Orthopaedic and Rehabilitation Clinic, 1089 Shimo-Oshi, Gyoda 361-0037, Japan |
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Abstract: | Background The purpose of this study was to determine the effect of intraoperative coronal laxity in total knee arthroplasty on the postoperative
condition.
Methods We conducted stress arthrometric studies using a Telos arthrometer on 40 knees in 36 patients. Both posterior cruciate ligament-retaining
(PCLR) prostheses and posterior cruciate-sacrificing (PCLS) prostheses were placed in 20 knees respectively. All of the TKA
procedures were judged clinically successful (Hospital for Special Surgery scores: PCLR 92 ± 3 points, PCLS 91 ± 4 points).
Laxities were measured under spinal anesthesia (immediately postoperatively) and 6 months postoperatively.
Results PCLR prostheses had an average of 2.9° ± 1.8° and 3.0° ± 1.2° in abduction and 4.4° ± 2.8° and 3.6° ± 1.5° in adduction under
anesthesia and the postoperative condition. PCLS prostheses had average laxities of 3.8° ± 1.4° and 3.5° ± 0.9° in abduction
and 4.6° ± 3.8° and 4.0° ± 1.7° in adduction. There were no significant differences between them.
Conclusions The findings suggest that surgeons should emphasize the achievement of suitable laxity under anesthesia to ensure the success
of total knee arthroplasty. |
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