Articular congruency of the Salto Talaris total ankle prosthesis

Morris, C.; Christensen, Jeffrey C.; Ching, Randal P.; Chan, Francis; Schuberth, John M.

doi:10.1016/j.fas.2015.01.003

Cited by 2 publications

(4 citation statements)

References 24 publications

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“…The design of the talar component of the Salto Talaris, with 2 radii of curvature and metal resurfacing of the lateral condyle, has been shown to be consistent with Inman's hypothesis that the talar trochlea is approximated as a truncated cone, with the axis directed from the lateral-proximal end to the medial-distal end, with the apex of the cone pointed medially. 3,8,11 However, Inman's hypothesis and the basis for this design has been challenged by later studies, which suggest that the Salto Talaris has incongruence between talar and polyethylene components. 9,11,14,17 In contrast to the Salto Talaris, the design of INBONE II is based on the 2-sphere fitting model that is purported to closely approximate the talar trochlea, 17 with improved stability from the first generation of the INBONE (Supplemental Figure S1).…”

Section: Discussionmentioning

confidence: 99%

“…3,8,11 However, Inman's hypothesis and the basis for this design has been challenged by later studies, which suggest that the Salto Talaris has incongruence between talar and polyethylene components. 9,11,14,17 In contrast to the Salto Talaris, the design of INBONE II is based on the 2-sphere fitting model that is purported to closely approximate the talar trochlea, 17 with improved stability from the first generation of the INBONE (Supplemental Figure S1). 13 We assume that the designs for each implant may explain the major differences in reoperation rates between 2 groups, but we must also acknowledge that other factors, such as implant or polyethylene size, varus or valgus thrust from hindfoot malalignment, and the adequacy of prophylactic resection depending on the surgeon, may have influenced the outcomes in each group.…”

Section: Discussionmentioning

confidence: 99%

“…3,8,11 However, Inman’s hypothesis and the basis for this design has been challenged by later studies, which suggest that the Salto Talaris has incongruence between talar and polyethylene components. 9,11,14,17…”

Section: Discussionmentioning

confidence: 99%

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Retrospective Comparison of Midterm Survivorship, Radiographic, and Clinical Outcomes of the INBONE II and Salto Talaris Total Ankle Arthroplasty Systems

et al. 2022

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Background: Prior studies on the INBONE II and Salto Talaris total ankle arthroplasty (TAA) systems have reported promising outcomes for both implants. This retrospective study aimed to compare the midterm differences between INBONE II and Salto Talaris TAA. Methods: Between 2007 and 2015, a total of 44 INBONE II consecutive cases and 85 Salto Talaris consecutive cases had minimum 5-year clinical and radiographic follow-up. Preoperative and midterm survivorship, postoperative Foot and Ankle Outcome Score (FAOS), and radiographic measures including tibiotalar alignment (TTA), medial distal tibial angle (MDTA), and sagittal tibial angle (STA) were compared. Results: Survivorship to revision was 97.6% (95% CI, 93.1%-100%) for the INBONE II group and 97% (95% CI, 93%-100%) for the Salto Talaris group ( P = .93). Survivorship to reoperation was significantly different: 95.5% for the INBONE II and 76.4% for Salto Talaris ( P = .021). Postoperative FAOS pain ( P = .01), symptoms ( P = .004), and sports activity ( P = .02) scores were significantly higher in the INBONE II group. The INBONE group had greater preoperative deformity (varus TTA P < .001, valgus TTA P = .02, valgus MDTA P = .005). Conclusion: Although both implants had similar longevity and postoperative alignment, the INBONE II resulted in greater clinical improvement and fewer reoperations than the Salto Talaris at midterm follow-up. Level of Evidence: Level III, retrospective cohort study.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Retrospective Comparison of Midterm Survivorship, Radiographic, and Clinical Outcomes of the INBONE II and Salto Talaris Total Ankle Arthroplasty Systems

et al. 2022

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“…A concern exists regarding the incongruent joint contact observed in asymmetrical TAA designs. 12,15 In a study using a computer model, Morris et al 15 showed marked incongruence between the talar and the polyethylene components in the Salto Talaris TAA. However, the clinical relevance of this finding is unknown, and there is no evidence suggesting that either symmetrical or asymmetrical implants result in improved survivorship.…”

Section: Discussionmentioning

confidence: 99%

Influence of Tibial Component Position on Altered Kinematics Following Total Ankle Arthroplasty During Simulated Gait

et al. 2019

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Background: Ankle and hindfoot kinematics following total ankle arthroplasty (TAA) are poorly understood and it is unclear whether patients can replicate physiologic motion after TAA. Furthermore, the effect of implant position on TAA kinematics is unknown. The objective of this study was to compare ankle and hindfoot kinematics pre- and post-TAA during simulated gait and determine to what degree tibial component position correlated with variations in ankle kinematics. Methods: Eight midtibia cadaveric specimens were utilized in this institutional review board–approved study. The stance phase of gait was simulated both pre- and post-TAA in each specimen using a 6 degrees of freedom robotic platform. Ankle and hindfoot kinematics were measured from reflective markers attached to bones via surgical pins. The effect of tibial component position on absolute differences in ankle kinematics was assessed using linear regression. Results: No differences were observed in ankle sagittal and coronal plane motion between the intact and TAA conditions. Differences in ankle joint kinematics were identified in the transverse plane, where internal talar rotation was significantly increased following TAA compared with the native condition. The medial-lateral position of the tibial component was found to correlate with the altered transverse plane motion observed after TAA (β = 1.861 degrees/mm, R2 = 0.72, P = .008). No significant differences in subtalar and talonavicular joint kinematics in any plane were observed comparing the pre- and post-TAA condition. Conclusion: This study demonstrated an increased internal rotation of the ankle in the transverse plane following TAA. This increase was correlated with the medial-lateral position of the tibial implant. Clinical Relevance: This finding could have clinical implications for how tibial components are positioned during the operative procedure, and how implant design and position may affect ankle kinematics following TAA.

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Articular congruency of the Salto Talaris total ankle prosthesis

Cited by 2 publications

References 24 publications

Retrospective Comparison of Midterm Survivorship, Radiographic, and Clinical Outcomes of the INBONE II and Salto Talaris Total Ankle Arthroplasty Systems

Retrospective Comparison of Midterm Survivorship, Radiographic, and Clinical Outcomes of the INBONE II and Salto Talaris Total Ankle Arthroplasty Systems

Influence of Tibial Component Position on Altered Kinematics Following Total Ankle Arthroplasty During Simulated Gait

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