Early Survivorship of Uncemented Total Knee Arthroplasty Varies by Age and Sex based on Data from the Michigan Arthroplasty Registry Collaborative Quality Initiative

Cemented and Cementless Robotic-Assisted versus Manual Total Knee Arthroplasty Outcomes: A Single Center Michigan Arthroplasty Registry Collaborative Quality Initiative-Based Study

BACKGROUND

The purpose of our study was to determine whether a difference existed between cemented and cementless robotic-assisted total knee arthroplasty (RA-TKA) and manual TKA with regard to revision rates and 90-day outcomes. We hypothesized these techniques would have similar results.

METHODS

A single center's data from the Michigan Arthroplasty Registry Collaborative Quality Initiative were queried for all primary TKAs from January 2012 to July 2023. The RA-TKA and manual cohorts were compared for revisions and 90-day complications, including emergency department (ED) visits, readmissions, and returns to the operating room Chi-square and Fisher's exact tests were used for categorical data, and t-tests for continuous data. Of the 7,417 cemented TKAs (mean age 67 ± 9.6 years, 70% women), 273 were RA-TKA and 7,144 were manual. Of the 2,407 cementless TKAs (mean age 65 ± 8.6 years, 53% women), 730 were RA-TKA and 1,677 were manual.

RESULTS

Cemented RA-TKA had more periprosthetic joint infection revisions, more 90-day ED visits, and readmissions for wound complications compared to cemented manual TKA. Cementless RA-TKA had more 90-day readmissions for wound complications, while manual TKA had more 90-day ED visits for postoperative pain. Cemented and cementless RA-TKA had longer surgical time, shorter length of stay, and shorter time to revision. There were 283 revisions performed on cemented manual TKA (nine RA-TKAs, 3.2%, 274 manual, 3.8%, (P = 0.87)). There were 56 revisions performed on cementless knees (13 RA-TKAs, 1.7%, 43 manual 2.5% (P = 0.303)). Cumulative percent revision at 5 years was 3.9% for cemented RA-TKA, 3.5% for cemented manual TKA, 1.8% for cementless RA-TKA, and 2.8% for cementless manual TKA.

CONCLUSIONS

Both RA-TKA and manual TKA have similar revision rates, while RA-TKA had more wound complications. Cementless RA-TKA may be beneficial in reducing postoperative pain.

Cementless unicompartmental knee arthroplasty is safe and effective at a minimum follow-up of 4.2 years: A systematic review

Purpose

Cemented unicompartmental knee arthroplasty (UKA) is a widely used procedure in the treatment of anteromedial and lateral knee osteoarthritis. However, several advantages are reported for cementless UKA, such as improved osseointegration, reduced cement-related costs and complications. The aim of this study was to analyse clinical outcomes, survival, complications, failures and revision rate of cementless UKA.

Methods

A systematic review was performed on 31 May 2024, on PubMed, Cochrane Library and Scopus. We included randomised clinical trials and prospective and retrospective studies reporting clinical outcomes, implant survival, complications, failures and revision rates of cementless UKA. The following data were extracted: study design, type of implant, number of patients and knees, follow-up, age, sex, pre-operative and post-operative clinical outcomes, reoperations and revisions with causes of failure and overall survival.

Results

Fifteen studies were included, involving 3475 patients and 3641 UKA (2568 cementless UKA and 854 cemented UKA). The mean patients' age was 66 years. The mean follow-up was 6.5 years. The Oxford Knee Score improved from 17.8 preoperatively to 40.3 post-operatively in cementless UKA. Knee Society Score improved from 118.2 preoperatively to 168.6 post-operatively in cementless UKA. The reoperation rate was 3.85% for cementless UKA and 9% for cemented UKA. The most common causes of revision were osteoarthritis progression (1.4%), aseptic loosening (0.8%), bearing dislocation and unexplained pain (0.7%). The overall survival of cementless UKA was 96.2% and 93.6% at 5 and 10 years, respectively.

Conclusion

Cementless UKA is a viable alternative to cemented UKAs with a low failure rate, without a lower clinical benefit at a minimum follow-up of 4.2 years.

Level of Evidence

Level III, systematic review of studies.

Uncemented Total Knee Arthroplasty in the State of Michigan has Higher Rates of Revision Through 5-Year Follow-Up

BACKGROUND

While cemented total knee arthroplasty (TKA) is considered the gold standard, uncemented designs are gaining popularity, especially in young men who are at higher risk of cemented failure. Assessing this growth's impact, the Michigan Arthroplasty Registry Collaborative Quality Initiative analyzed adoption rates of uncemented TKA and the effect of fixation technique on revision rates with the goal of assessing the revision rates and survivorship at five years of cemented versus uncemented TKA to further classify which patients may be more ideal candidates for cementless fixation.

METHODS

The Michigan Arthroplasty Registry Collaborative Quality Initiative data from 2017 to 2022 was analyzed to determine the survivorship of cemented versus uncemented TKAs. Descriptive statistics, demographics, and implant type were collected. Cumulative percent revision (CPR) was calculated based on the fixation method. The primary endpoint was time for the first revision. Kaplan-Meier survival curves were compared. Subanalyses were performed based on age, sex, body mass index, and implant type. Confidence intervals were set to 95%.

RESULTS

The registry query yielded 147,838 TKAs. There were 18,523 (12.5%) uncemented TKAs. Uncemented TKA use increased yearly from 2017 to 2022 in all groups. Uncemented TKA had higher CPR through five years at all time points versus cemented (3.65 versus 3.19%, P < 0.0001). Uncemented TKA performed worse in both men and women (P < 0.01, P < 0.01). Unexpectedly, men < 55 years had higher CPR at all time points for the four most used implants (P < 0.05).

CONCLUSIONS

The use of uncemented TKA has grown in Michigan across all patient subgroups. Uncemented TKAs had an overall higher risk of revision compared to cemented TKAs. The poorer outcomes appeared consistent across sex, age, and implant type. Younger men who are often preferred for uncemented fixation had higher failure rates. This study suggests that surgeons should be mindful of revision rates and patient selection when moving to uncemented TKA.

Cementless Total Knee Arthroplasty: A Resurgence-Who, When, Where, and How?

BACKGROUND

Total knee arthroplasty (TKA) is one of the most common procedures in orthopaedics, but there is still debate over the optimal fixation method for long-term durability: cement versus cementless bone ingrowth. Recent improvements in implant materials and technology have offered the possibility of cementless TKA to change clinical practice with durable, stable biological fixation of the implants, improved operative efficiency, and optimal long-term results, particularly in younger and more active patients.

METHODS

This symposium evaluated the history of cementless TKA, the recent resurgence, and appropriate patient selection, as well as the historical and modern-generation outcomes of each implant (tibia, femur, and patella). Additionally, surgical technique pearls to assist in reliable, reproducible outcomes were detailed.

RESULTS

Historically, cemented fixation has been the gold standard for TKA. However, cementless fixation is increasing in prevalence in the United States and globally, with equivalent or improved results demonstrated in appropriately selected patients.

CONCLUSIONS

Cementless TKA provides durable biologic fixation and successful long-term results with improved operating room efficiency. Cementless TKA may be broadly utilized in appropriately selected patients, with intraoperative care taken to perform meticulous bone cuts to promote appropriate bony contact and biologic fixation.