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Evaluation of soft-tissue balance during total knee arthroplasty. | LitMetric

Evaluation of soft-tissue balance during total knee arthroplasty.

J Orthop Surg (Hong Kong)

Department of Orthopedics, Jichi Medical University, Shimotsuke, Tochigi, Japan.

Published: April 2010

AI Article Synopsis

  • The study aimed to evaluate the balance of soft tissues during and after total knee arthroplasty (TKA) in patients with varus deformity.
  • The research involved 93 patients (18 men, 75 women) aged 52 to 85, where soft-tissue balance was measured using a specialized device at various stages of the surgery, including before and after the procedure.
  • Results showed that while equal soft-tissue balance was achieved during surgery, there was slightly greater lateral laxity observed immediately after TKA, indicating differences in stability between the medial and lateral sides of the knee.

Article Abstract

Purpose: To evaluate soft-tissue balance during versus after total knee arthroplasty (TKA).

Methods: 18 men and 75 women aged 52 to 85 (mean, 68) years who had moderate-to-severe varus deformity underwent TKAs using the Scorpio non-restrictive geometry posterior-stabilised system (Stryker Howmedica Osteonics; Allendale, [NJ], USA). All surgeries were performed by a single surgeon using the medial parapatellar approach. After the bony and soft-tissue procedures, soft-tissue balance was measured intra-operatively using a tensor/balancer device. The coronal laxity--angles between the cut surfaces of the femur and tibia--were measured at 0 degree (in extension) and 90 degrees (in flexion). The central gap was also measured. Immediate postoperative soft-tissue balance was measured using an arthrometer, while anteroposterior stress radiographs were being taken. A valgus or varus force was applied just above the knee on the lateral or medial side, with the knee counter-supported and at 15 degrees flexion.

Results: Intra-operatively, the mean coronal laxity at 0 degree (in extension) and 90 degrees (in flexion) was 2.1 degrees and -1.6 degrees, and the mean central gaps were 21.2 and 23.5 mm, respectively. Immediate postoperative mean coronal laxity was 2.9 degrees, indicating that lateral laxity was greater than medial laxity. The postoperative coronal laxity was positively corrected to the intra-operative coronal laxity at 0 degree (r=0.304, p=0.003), but not to the intra-operative coronal laxity at 90 degrees (r= -0.07, p=0.47).

Conclusion: Slightly greater lateral laxity was observed after TKA, although equal medial-lateral balance was achieved intra-operatively.

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Source
http://dx.doi.org/10.1177/230949901001800106DOI Listing

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