Does Race Affect Utilization of Unicompartmental vs Total Knee Arthroplasty? A Matched Cohort Study Within a Universal Health System.

Early clinical, radiological, and safety outcomes of NAVIO-assisted versus conventional unicompartmental knee arthroplasty: a systematic review and meta-analysis.

Favorable midterm clinical results of medial unicompartmental knee arthroplasty guided by coronal limb alignment using an image-free navigation system.

Does Prior Arthroscopy Delay Clinically Relevant Improvement Timelines Following Unicompartmental Knee Arthroplasty and Primary Total Knee Arthroplasty?

Obesity is associated with higher rates of revision following medial unicompartmental knee arthroplasty.

PurposeUnicompartmental knee arthroplasty (UKA) effectively alleviates pain and restores function in end‐stage knee osteoarthritis. However, the relationship between post‐operative knee skin temperature and systemic inflammatory responses remains poorly characterized. This study aimed to: (1) quantify changes in knee skin temperature and temperature difference for 6 months post‐UKA, (2) analyze correlations between temperature difference and serum inflammatory markers, (3) determine whether prolonged thermal alterations represent a normal healing response or potential early warning sign of complications.MethodsThis study included 100 individuals who underwent UKA for primary osteoarthritis. Bilateral Knee skin temperatures were measured via infrared thermography preoperatively and at post‐operative days (PODs) 1, 3, 5 and months 1, 3, 6, with strict ambient temperature control (20 ± 1.0°C). Concurrently, erythrocyte sedimentation rate (ESR), white blood cell count (WBC) and serum C‐reactive protein (CRP) were assessed. Functional recovery was quantified using Hospital for Special Surgery (HSS) knee score.ResultsA total of 100 patients participated in the study. Bilateral knee skin temperature and temperature difference peaked at POD 3 following UKA, with gradual normalization occurring over 6 months. The patient's CRP and WBC demonstrated progressive elevation until POD 3, while ESR exhibited delayed onset of increase. Subsequent measurements showed divergence in marker resolution: CRP and WBC levels initiate decline by POD 5, whereas ESR peaked at POD 5 following UKA. All inflammatory markers returned to preoperative levels during follow‐up.ConclusionThe skin temperature of the operated knee showed a rapid increase on the first POD following UKA, peaked on POD 3, and gradually returned to normal levels by 6 months after UKA. Moreover, there is a significant correlation between changes in temperature difference and serum inflammatory markers. Normal surgical reaction may cause this alteration.Level of EvidenceLevel III.

Forgetting the knee after high tibial osteotomy versus unicompartmental knee arthroplasty.

Data from the Swiss National Arthroplasty Registry SIRIS suggest that unicompartmental knee arthroplasty is associated with a lower risk of periprosthetic joint infection than total knee arthroplasty.

Although previous studies have examined total joint arthroplasties (TJA), research on the association between the Area Deprivation Index (ADI) and outcomes following unicompartmental knee arthroplasty (UKA) remains limited. This study evaluates outcomes following UKA and whether patients with higher ADIs (indicating greater socioeconomic disadvantage) are at increased risk for implant-related complications. A retrospective analysis was performed using a nationwide claims database from 2010 to 2022. The ADI was used to categorize patients into high and low ADI groups. A total of 26,058 primary UKA patients for osteoarthritis were 1:1 propensity-score matched by age, gender, and Elixhauser Comorbidity Index (ECI). Primary endpoints included 2-year implant-related complications and costs. Multivariable logistic regression models computed the odds ratios (OR) for the association between ADI and 2-year implant complications. P values < 0.001 were significant. Patients undergoing UKA with higher ADIs experienced no difference in the incidence and odds of implant-related complications within 2 years compared to those with lower ADIs. Periprosthetic fractures were less common in the high ADI group (0.21% versus 0.40%; OR: 0.53, P = 0.008). Periprosthetic joint infections (PJIs) (1.27% versus 1.33%; OR: 0.95, P = 0.701), aseptic loosening (1.14% versus 1.05%; OR: 1.08, P = 0.512), manipulations under anesthesia (MUA) (1.10% versus 0.92%; OR: 1.20, P = 0.153), or all-cause revisions (3.04% versus 2.86%; OR: 1.07, P = 0.378) were similar between groups. Patients in the higher ADI cohort had significantly higher day of surgery ($5,336 vs. $4,118;P < 0.0001) and 90-day costs ($7,462 vs. $6,431; P < 0.0001) after propensity-matching and adjustment for measured comorbidities. Patients undergoing UKA of higher ADIs did not experience significant differences in implant-related complications compared to those of lower ADIs. Socioeconomic disadvantage alone is not a major determinant of early implant-related outcomes following UKA. These findings support equitable patient selection and treatment decisions based on clinical indications rather than socioeconomic proxies of patient complexity. III.

Comparison of MAKO robotic-assisted and manual unicompartmental knee arthroplasty: a meta-analysis of radiographic precision and short-term functional results.

Patients Who Have a Preoperative Flexion Contracture Demonstrate Inferior Outcomes Following Unicompartmental Knee Arthroplasty Compared to Total Knee Arthroplasty.

We developed a novel unicompartmental pressure sensor to measure intraoperative medial compartment pressureduring robotic arm-assisted unicompartmental knee arthroplasty (UKA) and conventional jig-based UKA in order to assess the effect and impact of soft-tissue balance. This retrospective study evaluated 80 patients who underwent medial compartment UKA at our institution between November 2022 and June 2023, including 40 patients in conventional jig-based (mobile bearing) UKA and 40 patients in robotic arm-assisted (fixed bearing) UKA. After intraoperative soft-tissue balancing, the medial compartment pressure at 10°, 45°, and 90° of knee flexion was measured using a new unicompartmental pressure sensor. The knee range of motion (ROM), Numerical Rating Scale, and American Knee Society scores were recorded at three months and one year of follow-up. Conventional jig-based UKA did not achieve consistent medial compartment pressures at 10°, 45°, and 90° of knee flexion (p < 0.001), whereas robotic arm-assisted UKA achieved more balanced pressures at these angles (p-values between 10° vs 45°, 10° vs 90°, and 45° vs 90° were 0.132, 0.378, and > 0.999, respectively). In addition, robotic arm-assisted UKA showed better outcome scores and ROM at three months, but no significant clinical differences at the one-year follow-up. Intraoperative pressure measurements using the novel unicompartmental pressure sensor showed that robotic arm-assisted UKA was able to achieve more consistent pressure in the medial compartment than conventional jig-based UKA, which may improve early postoperative rehabilitation.

Unicompartmental knee arthroplasty (UKA) and high tibial osteotomy (HTO) surgeries are often preferred in individuals with medial knee osteoarthritis (OA). The aim of the study was to compare the functional outcomes of patients with UKA and HTO. Seventy-seven individuals were included in the study, of which 39 individuals had undergone HTO surgery (median age = 58.38 ± 7.99, median body mass index [BMI] = 30.93 ± 3.33 kg/m2) and 38 individuals had undergone UKA surgery (median age = 62.95 ± 7.74 years, median BMI = 30.48 ± 3.57 kg/m2). Pain was evaluated before and after surgery. Pain severity, 6-Minute Walk Test (6MWT), 10-Repetition Sitto-Stand Test (10 × STS), stairs test, Timed Up and Go (TUG), and Knee Injury and Osteoarthritis Outcome Score (KOOS) questionnaire were used for functional evaluation. There were no differences in demographic characteristics between groups (p > 0.05). The HTO group had lower postoperative pain (p = 0.043) and KOOS pain subscale scores (p = 0.043), better stairs test (p = 0.041), and 10 × STS results (p = 0.007). There were no significant differences between the groups in terms of the 6MWT, TUG, and KOOS total scores (p > 0.05). The results showed that individuals who underwent HTO surgery experienced less postoperative pain and had better functional levels compared with those who underwent UKA surgery. It shows that good functional performance can be achieved with HTO surgery in early medial compartment OA.

A comprehensive review of complications following unicompartmental knee arthroplasty

Null.

Fixed versus mobile bearing medial unicompartmental knee arthroplasty with the same femoral implant design: a randomised controlled trial with a minimum of 10-year follow-up.

Negative Influence of Joint Line Change on 10.8-Year Outcomes and Survival of Medial Unicompartmental Knee Arthroplasty.

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Aim &amp;lt;/strong&amp;gt;Recent studies challenge the initial belief that medial unicompartmental knee arthroplasty (UKA) is contraindicated for patients with anterior cruciate ligament deficiency (ACLD) due to increased risk of periprosthetic tibial fractures, revealing promising outcomes with advancements in surgical techniques and patient selection. This study aimed to evaluate the outcomes of patients who received medial unicompartmental knee arthroplasty with anterior cruciate ligament deficiency.&amp;lt;/p&amp;gt; &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Methods&amp;lt;/strong&amp;gt;&amp;lt;strong&amp;gt; &amp;lt;/strong&amp;gt;Five patients, aged 59-74, with knee pain, joint instability, and limited mobility, were treated for medial compartment osteoarthritis and ACLD using an Oxford design mobile-bearing unicompartmental knee prosthesis.&amp;lt;/p&amp;gt; &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Results &amp;lt;/strong&amp;gt;Medial UKA offers excellent clinical outcomes in ACL-deficient patients, improving knee function and reducing pain. It challenges the traditional view of ACLD as a contraindication, preserving knee kinematics and offering enhanced postoperative recovery. Advances in surgical techniques and prosthesis design expand their suitability.&amp;lt;/p&amp;gt; &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Conclusion &amp;lt;/strong&amp;gt;Medial UKA may be a viable treatment option for Osteoarthritis patients with ACLD, potentially offering an alternative to total knee arthroplasty.&amp;lt;/p&amp;gt;

Patients with Parkinson's disease (PD) are a vulnerable subgroup facing elevated risks of complications and functional decline following knee arthroplasty. However, data on the outcomes of minimally invasive unicompartmental knee arthroplasty (UKA) in this population are limited. This study´s purpose was to assess perioperative complications, implant revision-free and reoperation-free survivorship as well as functional outcome in PD patients following UKA. In this retrospective single-center study, 42 knees in 39 patients with PD who underwent medial or lateral UKA between 2016 and 2022 were analyzed. The mean age was 70.6 ± 9.1 years, and the mean BMI was 27.9 ± 5.2kg/m². A total of 26 medial and 16 lateral UKAs were performed, with a minimum follow-up of two years (mean 5.0 ± 2.0). All medical complications were recorded. Implant survivorship (tibia and/or femur) and reoperation-free survival were evaluated using Kaplan-Meier analysis, allowing estimation of long-term survival beyond the mean follow-up duration. Functional outcomes were assessed using the Oxford Knee Score (OKS) and the UCLA Activity Score. Of the 42 knees, 6 (14.3%) underwent reoperation, including 4 cases (9.5%) requiring implant revision. The cumulative 9-year implant survivorship was 90.5% (95% CI: 81.7-99.3), and reoperation-free survival was 85.7% (95% CI: 75.1-96.3), respectively. No perioperative cardiovascular complications occurred. OKS improved significantly from 16.2 ± 5.5 to 39.6 ± 7.1 (p = 0.027), while the UCLA Activity Score showed a trend towards improvement from 4.0 ± 2.0 to 5.0 ± 1.7 (p = 0.078). In this observational study, UKA in patients with PD was associated with favorable implant survivorship and encouraging functional outcomes. Considering the very low medical complication rate observed in this study, UKA may represent a viable treatment option for isolated end-stage unicompartmental osteoarthritis in carefully selected patients.

Robotic-assisted unicompartmental knee arthroplasty (R-UKA) is an emerging procedure; however, its benefits over conventional manual unicompartmental knee arthroplasty (C-UKA) are controversial, especially the revision and failure rates, and existing studies failed to reach a consensus on this issue. The literature search was conducted on four databases (PubMed, Embase, Cochrane Library and Web of Science) from inception to 28 April 2025 according to the guidelines for Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA). Eligibility criteria were studies that were written in English and reported any causes for a revision or failure subsequent to UKA with comparisons between R-UKA and C-UKA. The quality of each article was assessed using the Cochrane collaboration risk of bias tool or the Newcastle-Ottawa Scale. A total of 15 studies incorporating 29,982 patients with 30,099 knees (22,290 in the C-UKA group and 7809 in the R-UKA group) were analyzed. Compared with R-UKA, C-UKA showed higher total revision rates (RR: 1.58; 95% CI: ~1.33-1.87; P < 0.00001; I2 = 43%). Prosthesis loosening, infection, pain, and progression of disease were the main reasons for R-UKA revision, whereas for C-UKA revision, loosening, progression of disease, infection, and limb malalignment were the major causes. Loosening was the predominant reason in both groups across all follow-up periods; early revisions were also due to infection and disease progression. Within 2-5years, the secondary reasons differed, being limb malalignment for C-UKA and pain for R-UKA. Compared with C-UKA, R-UKA may lower the risk of revision related to loosening, disease progression, and limb malalignment. Loosening remains the primary revision cause for both. Large-scale prospective trials with unified technical details are warranted to draw more rigorous conclusions in the future. PROSPERO CRD420251042604.