Unicompartmental knee arthroplasty for lateral gonarthrosis

Long-term Results With a Lateral Unicondylar Replacement

“…Sah and Scott [32] reported no revision at 5 years in a group of 49 knees implanted with lateral UKA, as did Pennington et al [30] in a group of 29 knees at 12 years followup. The rate of radiolucencies observed in our series (10% of nonprogressive tibial radiolucencies) is comparable with those observed in previous series of lateral UKA at the same followup [27,30,32]. Although original reports comparing medial and lateral UKA were conflicting, the Table 2.…”

“…Our results at a maximum followup of 23 years ranged between the results of the old and recent studies of lateral UKA reported in the literature [5,13,17,22,27,30,32,33]. Recent studies reported a very low failure rate, whereas the results of older series were more controversial [5,13,17,22,27,30,32,33]. Comparing the earlier with the later operated patients, we observed an improvement in the results.…”

“…When there is full loss of cartilage in the affected compartment, UKA may offer an alternative to TKA when the other compartments are preserved with the potential advantage of reduced morbidity and preservation of bone stock [2,12]. Limited long-term followup data are available for lateral UKA in the literature [13,22,27,32,33] compared with the well-known functional outcomes reported for medial UKA [2,10]. We therefore asked (1) whether lateral UKA improved longer-term Knee Society scores and return to previous activity level); (2) whether there were any concerning longer-term radiographic findings (the Knee Society roentgenographic evaluation and scoring system); and (3) whether lateral UKA was durable as measured by survivorship to revision at 10 and 16 years for the patients operated on before or after 1989.…”

“…Furthermore, the mean followup (12.6 ± 4.2 years) is one of the longest reported in the literature with patients followed over 23 years (Fig. 4A-B) [5,13,17,22,27,30,32,33]. Finally, to consider the changes concerning the implants and the indications over time, we performed a direct comparison of the survivorship between the group of patients operated on before 1989 and the group of patients operated on after 1989.…”

Navigated lateral unicompartmental knee arthroplasty — Technique and case report

“…Whereas short-term outcomes for cases of lateral UKA with a 5-year follow-up have reported to have an 89% survival rate, 10-year follow-up analysis has shown an overall survivorship of only 67% [3,5] Although the precise cause of the relatively high failure rate of unicompartmental arthroplasty is not entirely known, it is believed to be multifactorial in nature. Improper patient selection and biomechanically unfavourable implant design have both been implicated.…”