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Review
. 2020 Sep 2;21(1):15.
doi: 10.1186/s10195-020-00551-x.

Unicompartmental knee arthroplasty, an enigma, and the ten enigmas of medial UKA

Anurag Mittal  1 , Prashant Meshram  2 , Woo Hyun Kim  1 , Tae Kyun Kim  3
Affiliations
Review

Unicompartmental knee arthroplasty, an enigma, and the ten enigmas of medial UKA

Anurag Mittal et al. J Orthop Traumatol. .

Abstract

Unicompartmental knee arthroplasty (UKA) is a bone- and ligament-sparing alternative to total knee arthroplasty in the patients with end-stage single-compartment degeneration of the knee. Despite being a successful procedure, the multiple advantages of UKA do not correlate with its usage, most likely due to the concerns regarding prosthesis survivability, patient selection, ideal bearing design, and judicious use of advanced technology among many others. Therefore, the purpose of this study is to review and summarize the debated literature and discuss the controversies as "Ten Enigmas of UKA."

Keywords: Bearing surface; Cementless; Cost effectiveness; Indications; UKA; Unicompartmental knee arthroplasty.

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Conflict of interest statement

None.

Figures

Fig. 1
Fig. 1
Ten Enigmas (TENIGMAs) of UKA
Fig. 2
Fig. 2
Fixed bearing UKA: noncongruous articular surface, small contact area, large point contact force, and ‘insert’ fixed to base plate. Mobile bearing UKA: congruous articular surface, large contact area, small point contact force, and mobile ‘insert’
Fig. 3
Fig. 3
a Mechanical axis (Maquet’s line) is a line from center of femoral head (A) to center of ankle (B); b Hip-knee-ankle axis is the angle between mechanical axis of femur (A to center of knee, C) and mechanical axis of tibia (C to B); c Tibial component coronal alignment is the angle between the line perpendicular to the mechanical axis of tibia and coronal axis of tibial component
Fig. 4
Fig. 4
a Tibial component slope is determined by the angle between the line perpendicular to posterior tibial cortex and the tibial component sagittal axis; b Femoral component sagittal alignment is determined by the angle between the line perpendicular to the component part placed on distal femur cut and the posterior cortical line of femur; c Interprosthetic divergence is the angle between the line perpendicular to the tibial component coronal axis and the long axis of femoral component
Fig. 5
Fig. 5
a Computer Navigation, b, d Robotic-assisted UKA, c Patient-specific instrumentation (PSI)
See this image and copyright information in PMC

References

    1. Ahlbäck S. Osteoarthrosis of the knee. A radiographic investigation. Acta Radiol Diagn (Stockh) 1968;277:7–72. - PubMed
    1. MacIntosh DL, Hunter GA. The use of the hemiarthroplasty prosthesis for advanced osteoarthritis and rheumatoid arthritis of the knee. J Bone Joint Surg. 1972;54(2):244–255. - PubMed
    1. Mckeever DC. The choice of prosthetic materials and evaluation of results. Clin Orthop Relat Res. 1955;6:17–21. - PubMed
    1. Marmor L. The modular knee. Clin Orthop Relat Res. 1973;94:242–248. - PubMed
    1. Goodfellow JW, Tibrewal SB, Sherman KP, O’Connor JJ. Unicompartmental oxford meniscal knee arthroplasty. J Arthroplasty. 1987;2(1):1–9. - PubMed