DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?

Fabio Catani; Francesco Zambianchi; Valerio Daffara; Alberto Negri; Giorgio Franceschi

doi:10.1302/1358-992X.2020.9.023

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DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?

The Knee Society (TKS) 2020 Members Meeting, held online, 10–12 September 2020.

Fabio Catani
Francesco Zambianchi
Valerio Daffara
Alberto Negri
Giorgio Franceschi

DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?

Catani F, Zambianchi F, Daffara V, Negri A, Franceschi G. DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?. Orthop Procs. 2020;102-B(SUPP_9):23-23. doi:10.1302/1358-992X.2020.9.023

Catani, Fabio, et al. “DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?.” Orthopaedic Proceedings, vol. 102-B, no. SUPP_9, 2020, pp. 23-23., https://doi.org/10.1302/1358-992X.2020.9.023

Catani, F., Zambianchi, F., Daffara, V., Negri, A., & Franceschi, G. (2020). DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?. Orthopaedic Proceedings, 102-B(SUPP_9), 23-23. https://doi.org/10.1302/1358-992X.2020.9.023

Catani, F., Zambianchi, F., Daffara, V., Negri, A. and Franceschi, G. (2020) “DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?.” Orthopaedic Proceedings, 102-B(SUPP_9), pp. 23-23. Available at: https://doi.org/10.1302/1358-992X.2020.9.023

Catani, Fabio, Francesco Zambianchi, Valerio Daffara, Alberto Negri, and Giorgio Franceschi. “DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?.” Orthopaedic Proceedings 102-B, no. SUPP_9 (2020): 23-23. https://doi.org/10.1302/1358-992X.2020.9.023

Catani F, Zambianchi F, Daffara V, Negri A, Franceschi G. DOES PREOPERATIVE OSTEOARTHRITIC GRADE AFFECT FORGOTTEN JOINT STATUS AND PATIENT SATISFACTION AFTER ROBOTIC ARM-ASSISTED UNICOMPARTMENTAL KNEE ARTHROPLASTY?. Orthop Procs. 2020 Oct 1;102-B(SUPP_9):23-23. https://doi.org/10.1302/1358-992X.2020.9.023

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Abstract

Background

Unicompartmental knee arthroplasty (UKA) patients with knee partial thickness cartilage loss have inferior functional performance compared to those with full thickness loss. Therefore, the aim of the present study was to investigate on the association between postoperative patients' joint awareness and satisfaction and preoperative radiographic osteoarthritis (OA) Ahlbäck grade in subjects undergoing robotic arm-assisted UKA.

Methods

This retrospective observational study includes 675 patients (681 knees) undergoing robotic arm-assisted UKA at two centres between January 2014 and May 2019. Pre-operatively, knee radiographs were performed, and Ahlbäck OA grade was measured by two independent observers. Post-operatively, patients were administered the Forgotten-Joint-Score-12 (FJS-12) and 5-Level-Likert-Scale to assess joint awareness and satisfaction. Postoperative complications and revisions were recorded. Correlations were described between FJS-12, satisfaction and OA grade by means of an adjusted multivariate statistical analysis.

Results

A total of 574 patients (580 UKAs) were assessed at a mean follow-up of 3.6 years post-operatively (85.2% follow-up rate; min. 12, max. 75 months). Nine UKAs were revised. Primary or secondary medial knee OA was the preoperative diagnosis in 538 cases, osteonecrosis was present in 42 cases. Cases were divided based on their preoperative Ahlbäck grade in Group A (joint space narrowing, Ahlbäck 1, 279 cases), Group B (joint space obliteration or minor bone attrition, Ahlbäck 2 and 3, 197 cases) and Group C (moderate or severe bone attrition, Ahlbäck 4 and 5, 104 cases). Moderate to severe OA grades (Group B and C) were associated with higher probability of higher postoperative FJS-12 compared to joint space narrowing group (Odds Ratio 1.6 and 1.7, respectively, p<0.05). No associations were described between OA grade and patients' satisfaction.

Conclusions

Patients with preoperative joint space obliteration and minor to severe bone attrition have higher probability of a having a forgotten joint after robotic arm-assisted UKA, compared to those without full cartilage thickness loss.