Proximal tibiofibular dislocation in a closing-wedge high tibial osteotomy causes lateral radiological gapping of the knee: a prospective randomized study

Torres Claramunt, Raúl; Sánchez Soler, Juan Francisco; Hinarejos Gómez, Pedro Angel; Sala-Pujals, Aleix; Leal Blanquet, Joan; Monllau García, Juan Carlos

doi:http://dx.doi.org/10.3390/jcm9061622

Proximal tibiofibular dislocation in a closing-wedge high tibial osteotomy causes lateral radiological gapping of the knee: a prospective randomized study

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Torres-Claramunt R, Sánchez-Soler JF, Hinarejos P, Sala-Pujals A, Leal-Blanquet J, Monllau JC. Et al. Proximal tibiofibular dislocation in a closing-wedge high tibial osteotomy causes lateral radiological gapping of the knee: a prospective randomized study. J Clin Med. 2020; 9(6):1622. DOI: 10.3390/jcm9061622

Abstract

Background: To determine whether a proximal tibiofibular joint dislocation (TFJD) increases lateral compartment gapping more than a fibular head osteotomy (FHO) during a closing-wedge high tibial osteotomy (CWHTO). The second objective was to determine whether lateral compartment gapping affects clinical outcomes. Methods: A prospective randomized clinical study was carried out that included 18 patients in Group 1 (FHO) and 18 in Group 2 (TFJD). Varus-stress radiographs of all the patients with both knees at full extension and at 30 ° of flexion were studied pre-operatively and 12 months post-operatively. Lateral compartment gapping was measured in millimeters. The Knee Society Score (KSS) was used to assess clinical stability. Results: The difference between the pre- and post-operative measurements relative to gapping in the lateral knee compartment at 0 ° of knee flexion was 1.3 mm (SD 1.8) in Group 1 and 4.5 mm (SD 2.4) in Group 2 (p = 0.006). At 30 ° of knee flexion, this difference was 1.9 mm (SD 1.2) in Group 1 and 5.2 mm (SD 3.1) in Group 2 (p = 0.01). No differences were observed in the pre- and post-operative period relative to gapping in healthy knees. Pre-operatively, both groups presented similar KSS knee values: Group 1 with 54.7 (SD 11.7), Group 2 with 54.8 (SD 11.1) (n.s.). Post-operatively, these values were also similar: Group 1 with 93.2 (SD 7.4), Group 2 with 93.5 (SD 5.5) (n.s.). Conclusions: In patients who have undergone a CWHTO, TFJ dislocation increases knee lateral compartment gapping when compared to an FHO at 0 ° and 30 ° of knee flexion. However, this fact seems to have no repercussion on the functional status of the knees as measured with the KSS at the one-year follow-up.