Tags

Type your tag names separated by a space and hit enter

A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty With Respect to Patient-Reported and Radiographic Outcomes.
J Arthroplasty. 2018 05; 33(5):1379-1383.JA

Abstract

BACKGROUND

Medial pivot (MP) type total knee arthroplasty (TKA) implants are designed with a highly congruent medial tibiofemoral articulation. Compared with the cam-and-post design of the posterior-stabilized (PS) TKA, the MP-TKA design has been hypothesized to better replicate the natural kinematics of the knee. We compared the MP-TKA and PS-TKA designs, with our primary outcome measures being range of motion (ROM) and patient-reported satisfaction.

METHODS

This study was a retrospective comparison between the 2 groups (76 MP-TKA vs 88 PS-TKA). ROM was collected preoperatively, 6 weeks, 6 months, and 1 year postoperatively. The Forgotten Joint Score-12 (FJS-12) scores were collected at a minimum of 1 year postoperatively.

RESULTS

There was no statistically significant difference in age, gender, or body mass index between the groups. We found a statistical difference in preoperative ROM (MP = 120.3°, PS = 112.8°, P = .002). There was no difference in ΔROM at 6 weeks (MP = -12.36, PS = -3.79, P = .066), 6 months (MP = -4.23, PS = 2.73, P = .182), or 1 year (MP = .17, PS = 3.31, P = .499). Patients who underwent the MP-TKA scored significantly better than the PS-TKA on the FJS-12 score (MP = 59.72, PS = 44.77, P = .007).

CONCLUSION

We found that patients who underwent the MP-TKA scored better on the FJS than those who underwent the PS-TKA; particularly with regard to deep knee flexion and stability of the prosthesis. The MP-TKA design may offer improved patient outcomes because of its highly congruent medial tibiofemoral articulation.

Authors+Show Affiliations

Granovsky Gluskin Division of Orthopaedics, Sinai Health System, University of Toronto, Toronto, Ontario, Canada; University of Aberdeen, School of Medicine, Aberdeen, United Kingdom.Granovsky Gluskin Division of Orthopaedics, Sinai Health System, University of Toronto, Toronto, Ontario, Canada.Granovsky Gluskin Division of Orthopaedics, Sinai Health System, University of Toronto, Toronto, Ontario, Canada.Granovsky Gluskin Division of Orthopaedics, Sinai Health System, University of Toronto, Toronto, Ontario, Canada.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

29276117

Citation

Samy, David A., et al. "A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty With Respect to Patient-Reported and Radiographic Outcomes." The Journal of Arthroplasty, vol. 33, no. 5, 2018, pp. 1379-1383.
Samy DA, Wolfstadt JI, Vaidee I, et al. A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty With Respect to Patient-Reported and Radiographic Outcomes. J Arthroplasty. 2018;33(5):1379-1383.
Samy, D. A., Wolfstadt, J. I., Vaidee, I., & Backstein, D. J. (2018). A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty With Respect to Patient-Reported and Radiographic Outcomes. The Journal of Arthroplasty, 33(5), 1379-1383. https://doi.org/10.1016/j.arth.2017.11.049
Samy DA, et al. A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty With Respect to Patient-Reported and Radiographic Outcomes. J Arthroplasty. 2018;33(5):1379-1383. PubMed PMID: 29276117.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A Retrospective Comparison of a Medial Pivot and Posterior-Stabilized Total Knee Arthroplasty With Respect to Patient-Reported and Radiographic Outcomes. AU - Samy,David A, AU - Wolfstadt,Jesse I, AU - Vaidee,Iman, AU - Backstein,David J, Y1 - 2017/12/07/ PY - 2017/08/31/received PY - 2017/11/13/revised PY - 2017/11/24/accepted PY - 2017/12/26/pubmed PY - 2019/2/5/medline PY - 2017/12/26/entrez KW - TKA design KW - forgotten joint score KW - medial pivot KW - patient-reported outcome measure KW - posterior-stabilized primary total knee arthroplasty SP - 1379 EP - 1383 JF - The Journal of arthroplasty JO - J Arthroplasty VL - 33 IS - 5 N2 - BACKGROUND: Medial pivot (MP) type total knee arthroplasty (TKA) implants are designed with a highly congruent medial tibiofemoral articulation. Compared with the cam-and-post design of the posterior-stabilized (PS) TKA, the MP-TKA design has been hypothesized to better replicate the natural kinematics of the knee. We compared the MP-TKA and PS-TKA designs, with our primary outcome measures being range of motion (ROM) and patient-reported satisfaction. METHODS: This study was a retrospective comparison between the 2 groups (76 MP-TKA vs 88 PS-TKA). ROM was collected preoperatively, 6 weeks, 6 months, and 1 year postoperatively. The Forgotten Joint Score-12 (FJS-12) scores were collected at a minimum of 1 year postoperatively. RESULTS: There was no statistically significant difference in age, gender, or body mass index between the groups. We found a statistical difference in preoperative ROM (MP = 120.3°, PS = 112.8°, P = .002). There was no difference in ΔROM at 6 weeks (MP = -12.36, PS = -3.79, P = .066), 6 months (MP = -4.23, PS = 2.73, P = .182), or 1 year (MP = .17, PS = 3.31, P = .499). Patients who underwent the MP-TKA scored significantly better than the PS-TKA on the FJS-12 score (MP = 59.72, PS = 44.77, P = .007). CONCLUSION: We found that patients who underwent the MP-TKA scored better on the FJS than those who underwent the PS-TKA; particularly with regard to deep knee flexion and stability of the prosthesis. The MP-TKA design may offer improved patient outcomes because of its highly congruent medial tibiofemoral articulation. SN - 1532-8406 UR - https://www.unboundmedicine.com/medline/citation/29276117/A_Retrospective_Comparison_of_a_Medial_Pivot_and_Posterior_Stabilized_Total_Knee_Arthroplasty_With_Respect_to_Patient_Reported_and_Radiographic_Outcomes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0883-5403(17)31054-9 DB - PRIME DP - Unbound Medicine ER -