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Background: Modification total knee implant designs bring hope of more rapid recovery with improved patient satisfaction and longevity. However, these proposed improvements also increase implant costs. The purpose of this study was to determine whether newer designs with greater size options of the femur and tibia result in improved short term clinical results. Methods: Sixty DePuy Attune and 49 Zimmer Persona knees were compared to 33 DePuy Sigma and 49 Stryker Triathlon knees. All knees were done by a single high volume total joint fellowship trained surgeon. Patients were prospectively entered into a database. Variables recorded include: age, sex, weight, height, date of surgery, laterality of the operative knee joint, pre-operative and post-operative body mass index, preoperative and post-operative knee range of motion, preand post-operative Knee Society Scores (KSS), and lower extremity activity scale (LEAS) scores. Clinical parameters were recorded at six weeks and six months post-operatively. Data were retrospectively reviewed and statistical analyses were performed. Results: There were no significant differences among groups when comparing: change in flexion from pre-operative values at six weeks and six months post-operatively, change in total flexion arc at six weeks and six months post-operatively, and change in KSS at six months postoperatively (p> 0.05 for all). There were no significant differences in six-month LEAS (p> 0.05) among groups. Conclusion: This pilot study suggests higher priced, newer total knee designs give neither a speedier recovery nor improved patient function in the first six months, compared to commonly used designs when identical surgical paradigms are used.

Do New knee Implant Designs Accelerate Early Motion and Function in Total knee Arthroplasty (TKA) Patients?