Femoro Patella Vialla patellofemoral arthroplasty: An independent assessment of outcomes at minimum 2-year follow-up

Outcomes and complications of inlay versus onlay patellofemoral arthroplasty: A systematic review

PURPOSE

The purpose of this systematic review was to evaluate outcomes and complications rates between inlay and onlay patellofemoral arthroplasty (PFA).

METHODS

According to the PRISMA statement, 42 studies with 2552 patients were included. Data considered for quantitative analysis consisted of the Knee Society Score (KSS), the range of motion (ROM), the visual analogue score (VAS), and the Western Ontario and McMaster Universities questionnaire (WOMAC). Complications and revision surgery were considered.

RESULTS

Data on postoperative KSS showed no differences between the groups. The ROM was evaluated in 8 studies for 70 and 331 inlay and onlay PFA, respectively. Onlay group was favorable in terms of postoperative ROM. Postoperative VAS was available for 64 inlay and 110 onlay and no differences were found. Data on postoperative WOMAC were available for 49 inlay and 527 onlay PFA and inlay group showed better scores. A statistically significant higher rate of instability, persistent pain, malposition, stiffness, deep infection, disease progression, and wear of the patellar component were noted in the inlay group. A higher rate of lateral release was noted in the onlay group. A higher number of manipulations under anesthesia was noted in the inlay group. The revision to total knee arthroplasty was reported more frequently in the inlay group.

CONCLUSION

A higher rate of conversion to total knee arthroplasty and complication rates after inlay technique was found. The potential of achieving better WOMAC scores with the inlay technique should be weighed against the higher complication and revision rates compared to the onlay technique.

LEVEL OF EVIDENCE

IV.

Minimally Invasive Robotic-Assisted Patellofemoral Arthroplasty

Isolated patellofemoral arthritis is a common debilitating condition in adults older than 40 years of age. Surgical options such as patellofemoral arthroplasty exist for those who failed to respond to nonoperative treatment. However, early patellofemoral arthroplasty techniques often resulted in poor outcomes due to mal-tracking and malalignment of components. Robotic-assisted surgery recently has been introduced as an alternative to classic patellofemoral arthroplasty, with the potential to improve the anatomical fit and reproducibility of implant positioning. We present the technique for minimally invasive robotic-assisted patellofemoral arthroplasty system.

Failure modes of patellofemoral arthroplasty-registries vs. clinical studies: a systematic review

Background and purpose - Patellofemoral arthroplasty (PFA) has been debated since early studies showed poor implant survival. Recent studies show better results. This review reports failure modes for PFA and investigates differences in data reported from registries and clinical studies. Additionally, we report differences in failure modes among implant designs. Methods - A systematic search was performed in September 2018. All studies and registers describing failure modes of PFA were included and implant design was noted for each revision. Results - This review includes 1,299 revisions of a primary PFA reported in 47 clinical studies and 3 registers. The failure modes were: 42% OA progression, 16% pain, 13% aseptic loosening, 12% surgical error, 4% wear, 2% infection, 2% broken patellar component, 1% stiffness, 1% fracture, and 7% other. The data from registries and cohort studies differed statistically significantly in 7 out of 12 failure modes. Significant differences were found in several failure modes among implant designs. Interpretation - OA progression is the most common failure mode of PFA. There are significant differences in data on failure modes between registers and protocolled studies, notably for surgical error. The implant design significantly influences several of the failure modes. In conclusion, indication, surgical technique, and implant design are important for a successful PFA, and register-based failure modes should be interpreted with caution.

Patient satisfaction reporting for patellofemoral arthroplasty is significantly lacking: a systematic review

Background: Patellofemoral Arthroplasty (PFA) has been shown to be successful in restoring knee function and quality of life in patients with the isolated patellofemoral disease. Patient satisfaction has been suggested as an indicator of the quality of elective orthopedic operations, although there remains no standardized method to collect and evaluate satisfaction. The present study offers a systematic review of the available literature concerning patient satisfaction following PFA to assess common methodologies for reporting patient satisfaction. Methods: A query of the Medline database produced 116 articles that were reviewed for inclusion in the review. The following inclusion criteria were used to identify suitable articles: English language, clinical outcomes study related to PFA, and patient-reported satisfaction as an outcome measure. Results: Seven studies met inclusion criteria and were eligible for review. The highest level of evidence was level-III. The study publication dates ranged from 2009 to 2016, with six published in 2015 & 2016. In total, 320 PFAs were performed on 267 patients. Four articles reported the proportion of included patients who had previous knee surgeries (range: 20-60%). Three studies used ordinal scales to rate patient satisfaction. Four studies (57.1%) reported the numeric proportion of patients satisfied following PFA, which ranged from 76% to 96.5%. Two studies used Visual Analog Scale methods. For these two studies, one of them reported the mean satisfaction score as 7.5/10, and the other reported a median of 90/100. Conclusions: The available literature on patient satisfaction after PFA was found to be limited, with low-quality evidence and variable methodology.

Advances in Patellofemoral Arthroplasty

PURPOSE OF REVIEW

To describe current indications, implants, economic benefits, comparison to TKA, and functional and patient-reported outcomes of patellofemoral arthroplasty.

RECENT FINDINGS

Modern onlay implants and improved patient selection have allowed for recent improvements in short- and long-term outcomes after patellofemoral joint replacement surgery. Patellofemoral arthroplasty has become an increasingly utilized technique for the successful treatment of isolated patellofemoral arthritis. Advances in patient selection, implant design, and surgical technique have resulted in improved performance and longevity of these implants. Although short- and mid-term data for modern patellofemoral arthroplasties appear promising, further long-term clinical studies are needed to evaluate how new designs and technologies will affect patient outcomes and long-term implant performance.