A Mid-term Comparison of the Functional Outcomes of Medial Pivot and Rotating Platform Mobile-Bearing Total Knee Arthroplasty in the Indian Population

• Published in: Indian journal of orthopaedics 2022-02, Vol.56 (2), p.271-279
• Main Authors: Shakya, Akash, Singh, Vijay, Agrawal, Romit A., Sharma, Ayush, Mangale, Nilesh, Wadgave, Venkatramana, Jaiswal, Ajay
• Format: Article
• Language: English
• Subjects: Conservative Orthopedics; Medicine; Medicine & Public Health; Original; Original Article; Orthopedics; Surgical Orthopedics
• ISSN: 0019-5413; 1998-3727
• DOI: 10.1007/s43465-021-00472-9

Background Both medial pivot (MP) and rotating platform (RP) mobile-bearing (MB) total knee arthroplasty (TKA) have been developed to better mimic the natural knee kinematics and femoral roll back in flexion. The purpose of this retrospective study was to compare the mid-term functional outcomes and range of motion (ROM) of MP and RP types of total knee arthroplasty. Methods 116 patients (mean age of 66.3 years) undergoing TKA (52 Medial pivot design and 64 Rotating Platform design) were evaluated retrospectively with Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) knee score, knee society score (KSS) with its subgroups namely, Knee Score (KSKS) and Functional Score (KSFS) and forgotten joint score (FJS) at a mean follow-up of 7.1 years. Range of motion (ROM) and tibiofemoral anatomic angle on the radiographs were also compared. Results Mean ROM, WOMAC and KSKS improved significantly from pre-operative to postoperative knees in both the groups. There was, however, no significant difference between the two groups at the final follow-up. In contrast, mean KSFS score improved to 89.5 ± 8.1 in MP group and 86.3 ± 7.1 in RP Group ( p  = 0.025), while mean FJS was 85.6 ± 4.1 and 80.9 ± 5.4 in the MP and RP groups, respectively ( p  =