Short-term results of triathlon cementless versus cemented primary total knee arthroplasty.
BACKGROUND
Recent studies have demonstrated that aseptic loosening remains a leading cause of failure after total knee arthroplasty (TKA). Cementless fixation is a possible strategy for countering this problem. This study compared short-term survivorship and functional results of patients undergoing primary TKA with cementless versus cemented implants.


METHODS
A multi-center database was utilized to identify 3849 patients undergoing primary TKA between 2012 and 2017 with a minimum two-year follow-up. Patients were divided into cementless (699), and cemented TKA (3150). The outcome of TKA including revision for aseptic or septic reasons, and other outcome variables were compared. Six hundred five patients from the cementless group (case) were matched with 605 patients from the cemented group (controls). Both groups were compared for outcomes and related variables.


RESULTS
Both matched groups were similar in age, race, gender, height, weight, BMI, laterality, femoral component type, follow-up duration, preoperative and postoperative physical and mental health, and functional activities (all p-values>0.05). Although the cementless TKA group had more components in varus alignment (p = 0.015) and were taller (p < 0.001), the aseptic revision rate and time to failure were similar in both groups (p-values = 0.256 and 0.0890 respectively). The rate of revision for infection was also the same in both groups (p = 0.452).


CONCLUSION
Cementless TKA demonstrated an equivalent rate of aseptic and septic failure when compared to cemented TKA in the short-term. Time to aseptic failure was also similar in both groups.
['Yazdi|Hamidreza|H|', 'Choo|Kevin J|KJ|', 'Restrepo|Camilo|C|', 'Hammad|Mohammed|M|', 'Sherman|Matthew|M|', 'Parvizi|Javad|J|']
D000368:Aged D019645:Arthroplasty, Replacement, Knee D001843:Bone Cements D005260:Female D005500:Follow-Up Studies D006801:Humans D007720:Knee Prosthesis D008297:Male D008875:Middle Aged D011474:Prosthesis Design D011475:Prosthesis Failure D013997:Time Factors D016896:Treatment Outcome
Cementless Cemented Total knee arthroplasty Aseptic revision Septic revision