Comparison of Functional Outcomes of Total Knee Arthroplasty Using Two Different Single Radius Implants

Abstract

Total knee arthroplasty is used as the treatment plan for patients with end-stage osteoarthrosis associated with severely affected function. Although TKA has been used for many years, some patients have reported overall dissatisfaction regarding the outcome. This may be due to the complexity of the joint design. In recent years, the concept of single-radius knee prosthetics is gaining more popularity as many studies have discussed biomechanical and clinical benefits of such design compared to traditionally used multi-radius implants. In this study, we report the outcome of 78 patients who were treated by TKA utilizing a relatively new single-radius implant, Unity. Results showed that all subjects reported good outcomes as expressed by significant improvement in their Knee Injury and Osteoarthritis Outcome Scores at 1-year post-operative. The symptom, pain, and ADL subscores demonstrated significant improvement in patients with scores twice the pre-operative value, while the average improvement in sport and quality of life subscores showed even greater improvement with scores three times the pre-operative value.

Computational analysis of customized cruciate retaining total knee arthroplasty restoration of native knee joint biomechanics

“…Despite the major benefits of standard OTS TKA, its postoperative preservation of functional outcomes similar to normal kinematics is still controversial (1,2,4,43). Patientspecific instrument has been developed to overcome the problems caused by altered geometry in variations in implant alignment.…”

“…However, each implant system with different surgical techniques has led to inconsistent postoperative outcomes in terms of the normal functions of the knee joint (4). Moreover, limitations in normal activities such as a narrower range of motion, lower stability of the knee than that of the normal knee joint, and loss of proprioception could be potential factors causing unsatisfactory postoperative outcomes (4). Moreover, limitations in normal activities such as a narrower range of motion, lower stability of the knee than that of the normal knee joint, and loss of proprioception could be potential factors causing unsatisfactory postoperative outcomes (4).…”

“…TKA has been shown to alleviate pain and to preserve the function of the knee joint close to the normal level. However, each implant system with different surgical techniques has led to inconsistent postoperative outcomes in terms of the normal functions of the knee joint (4). In the past years, many aspects in primary TKA, such as patient selection, surgical technique, and implant design, have been developed and improved; however, it has been reported that 14% to 39% of patients were dissatisfied with their primary TKA in previous studies (5)(6)(7)(8)(9).…”

“…In the past years, many aspects in primary TKA, such as patient selection, surgical technique, and implant design, have been developed and improved; however, it has been reported that 14% to 39% of patients were dissatisfied with their primary TKA in previous studies (5)(6)(7)(8)(9). Moreover, limitations in normal activities such as a narrower range of motion, lower stability of the knee than that of the normal knee joint, and loss of proprioception could be potential factors causing unsatisfactory postoperative outcomes (4). The current knee implants have been designed with the average anatomical geometry of various patient populations (10).…”