Table 3. Review of Available Literature Comparing Outcomes of Medial Pivot vs. Other Designs.
| Study type | Study | Follow-up (yr) | MP TKA/other design | Outcome assessed (MP vs. other design) | |||
|---|---|---|---|---|---|---|---|
| ROM | PROM | Performance | General health | ||||
| Retrospective | |||||||
| Matched pair | Bae et al. (2016)13) | 5 | 150/150 (PS) | Better in PS | No difference (KSS & WOMAC) | Better in MP (Kujala & Feller) | - |
| Matched pair | Nakamura (2018)25) | 2 | 45/45 (CR) | Better in MP | Better in MP (KSS) | - | - |
| Case series | Samy (2018)22) | 1 | 76/88 (PS) | ND | Better in MP (FJS) | - | - |
| Case series | Shakespeare (2006)24) | 1 | 261/288 (PS) | ND | - | - | - |
| Case series | Choi et al. (2017)23) | 5 | 49/52 (UC/RP) | ND | No difference (KSS & WOMAC) | - | - |
| Prospective | |||||||
| RCT | Hossain et al. (2011)5) | 2 | 40/40 (PS) | Better in MP | Better in MP (WOMAC/Pain) | Better in MP (TKFQ) | Better physical in MP (SF-36) |
| RCT | Kim et al. (2009)18) | 2 | 92/92 (PS mobile) | Better in PS | Better in PS (KSS) | Better in PS (HSS) | - |
| RCT | Kim et al. (2017)19) | 11 | 182/182 (UC/RP) | Better in UC | Better in PS (KSS & WOMAC) | - | - |
| RCT | Benjamin (2018)20) | 2 | 45/45 (PS-single radius) | - | ND (KSS) | - | - |
| Cohort study | Papagiannis (2016)21) | 24/22 (UC/RP) | ND | ND (KSCS) | ND (KFS) | - | |
| RCT | This study (2018) | 2 | 37/36 (PS) | Better in PS | ND FJS/better objective KSS in PS | Better in MP (SPW & TUG) | ND (EQ-5D) |
MP: medial pivot, TKA: total knee arthroplasty, ROM: range of motion, PROM: patient-reported outcome measures, PS: posterior-stabilized, KSS: Knee Society Score, WOMAC: Western Ontario and McMaster Universities osteoarthritis index, CR: cruciate-retaining, ND: no difference, FJS: Forgotten Joint Score, UC/RP: ultracongruent/rotating platform insert, RCT: randomized controlled trial, TKFQ: total knee function questionnaire, SF-36: 36-item short form health survey, HSS: Hospital for Special Surgery Score, KSCS: Knee Society Clinical Score, KFS: Knee Function Score, SPW & TUG: self-paced walk and timed up and go, EQ-5D: European Quality of Life Index five dimensional on visual analog scale.