Long-term Results With a Lateral Unicondylar Replacement

Abstract

While the literature suggests lateral unicondylar knee arthroplasty (UKA) improves function in the shortand medium-term, it is less clear on longer-term function.

Navigated lateral unicompartmental knee arthroplasty — Technique and case report

“…Long-term results after 13 yearshave showedsurvivorships of greater than 90% [21]. Repeated clinical and radiographic follow-up confirmed a reduction in pain and an increase in function and range-of-motion components in patients after lateral UKA after 60 months [22].…”

Lateral Unicompartmental Knee Arthroplasty Through a Lateral Parapatellar Approach Has High Early Survivorship

“…While many studies describe MUKA, there are far fewer studies describing pain relief and restoration of function after LUKA [4,7,9,18,22,29,33,34,36,39,41]. Even when the procedure is reported in the literature, the numbers in the studies are small and the surgical approach is either via a medial parapatellar, not described, or rarely described as being via the lateral parapatellar [36].…”

“…In the series with perhaps the longest followup, O'Rourke et al [33] noted 72% survival in 14 LUKAs at 24 years. In recent studies with fixed-bearing, cemented tibial implants, Argenson et al [7] reported a prosthesis survivorship of 92% at 10 years and 84% at 16 years. Sah and Scott [39] described LUKA through a median parapatellar arthrotomy in 49 patients and observed no revisions at 5.4 years postoperatively.…”

“…Isolated lateral osteoarthritis is much less common, with an incidence of 5% to 10% of osteoarthritic knees [39,40]. For this reason, studies of isolated lateral unicompartmental knee arthroplasty (LUKA) are less common than those for medial unicompartmental knee arthroplasty (MUKA) [4,7,9,18,22,29,33,34,36,39,41].…”

“…Furthermore, the lateral compartment has a more complex kinematic profile than the medial compartment, with the screw-home mechanism being most evident laterally [9,39]. Eleven studies report on LUKA [4,7,9,18,22,29,33,34,36,39,41], but many of these have small numbers and the surgical approach is either via a medial parapatellar or not described (Table 1).…”