Varus Knee Deformity after Open Knee Fracture: A Case Report

Purpose: To evaluate the integrity of lateral soft tissue in varus osteoarthritis knee by comparing the mechanical axis under varus stress during navigation-assisted total knee arthroplasty before and after compensating for a bone defect with the implant. Methods: Sixty-six knees that underwent total knee arthroplasty were investigated. The mechanical axis of the operated knee was evaluated under manual varus stress immediately after knee exposure and after navigation-assisted implantation. The correlation between each value of the mechanical axis and degree of preoperative varus deformity was compared by regression analysis. Results: The maximum mechanical axis under varus stress immediately after knee exposure increased in proportion to the degree of preoperative varus deformity. Moreover, the maximum mechanical axis under varus stress after implantation increased in proportion to the degree of preoperative varus deformity. Therefore, the severity of varus knee deformity leads to a progressive laxity of the lateral soft tissue. However, regression coefficients after implantation were much smaller than those measured immediately after knee exposure (0.99 vs 0.20). Based on the results of the regression formula, the postoperative laxity of the lateral soft tissue was negligible, provided that an appropriate thickness of the implant was compensated for the bone and cartilage defect in the medial compartment without changing the joint line. Conclusion: The severity of varus knee deformity leads to a progressive laxity of the lateral soft tissue. However, even if the degree of preoperative varus deformity is severe, most cases may not require additional procedures to address the residual lateral laxity.

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Corrigendum to “Open Periprosthetic Knee Fracture: A Case Report and Review of the Literature”

Geriatric Orthopaedic Surgery & Rehabilitation ◽

10.1177/2151459320966251 ◽

2020 ◽

Vol 11 ◽

pp. 215145932096625

Keyword(s):

Case Report ◽

Review Of The Literature ◽

Knee Fracture

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Arthroscopy-Assisted Computer Navigation in High Tibial Osteotomy for Varus Knee Deformity

Journal of Orthopaedic Surgery ◽

10.1177/230949900901700112 ◽

2009 ◽

Vol 17 (1) ◽

pp. 51-55 ◽

Cited By ~ 9

Author(s):

WN Lo ◽

KW Cheung ◽

SH Yung ◽

KH Chiu

Keyword(s):

High Tibial Osteotomy ◽

Computer Navigation ◽

Mean Deviation ◽

Tibial Osteotomy ◽

Open Wedge ◽

Varus Knee ◽

Knee Alignment ◽

Knee Deformity ◽

The Mean ◽

Open Wedge Hto

Purpose. To assess the accuracy of knee alignment after high tibial osteotomy (HTO) for varus knee deformity using arthroscopy-assisted computer navigation. Methods. Six men and 4 women aged 47 to 53 (mean, 49) years underwent medial open wedge HTO for varus knee deformity and medial unicompartmental osteoarthritis using arthroscopy-assisted computer navigation with fluoroscopy. Patients were followed up for a mean of 23 (range, 11–32) months. Intra- and post-operative leg alignments were compared. Results. The mean postoperative coronal plane alignment was 2.7 (range, 1–4) degree valgus; the mean deviation from intra-operative computer images was one (range, 0.1–1.9) degree; 5 knees had less valgus in the postoperative radiographs than the intra-operative computer images. Conclusion. Despite being more technically demanding, time consuming, and costly, arthroscopy-assisted computer navigation is safe, accurate, and reliable for HTO.

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