Jens Ole Laursen1,2,3, Christian Backer Mogensen4,5, Helene Skjøt-Arkil4,5. 1. Department of Emergency Medicine, Hospital of Southern Jutland, Kresten Philipsensvej 15, 6200, Aabenraa, Denmark. jens.ole.laursen@rsyd.dk. 2. Department of Orthopedic Surgery, Hospital of Southern Jutland, Soenderborg, Denmark. jens.ole.laursen@rsyd.dk. 3. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark. jens.ole.laursen@rsyd.dk. 4. Department of Emergency Medicine, Hospital of Southern Jutland, Kresten Philipsensvej 15, 6200, Aabenraa, Denmark. 5. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark.
Abstract
PURPOSE: The aim of this study was to investigate the long-term outcome of the unicompartmental knee resurfacing prosthesis (UniCAP) using clinical and radiographic assessments, and to evaluate the revision and survival rates. METHODS: This was a prospective cohort study of patients with UniCAP prostheses with 6-9 years of follow-up. The clinical examination included the Knee Society Score (KSS) and Visual Analogue Scale (VAS) score. The radiographic examination included the Kellgren-Lawrence (KL) grading scale. A comparison analysis of the clinical preoperative and follow-up data and a Kaplan-Meier survival analysis were performed. RESULTS: Of the 64 UniCAP patients, 36 (56%) were revised and one died. Examinations were performed on 23 (85%) of them. When compared with the preoperative data, the examinations showed a significant increase in the KSS objective [mean = 47.4, standard deviation (SD) = 5.8 vs. mean = 90.0, SD = 6.9] and function (mean = 46.7, SD = 6.8 vs. mean = 91.1, SD = 6.9) scores, a decrease in the VAS-score (mean = 7.3, SD = 0.5 vs. mean = 3.4, SD = 1.4) and a significant increase in the KL medial score (mean = 1.7, SD = 0.6 vs. mean = 2.1, SD = 0.5). The Kaplan-Meier survival rate after 5 years indicated good long-term outcomes. CONCLUSIONS: There was a survival rate of approximately 40% after 9 years of follow-up, but in the group of patients (35-65 years old) not eligible for a final total arthroplasty. These patients were often left with pain and disability. This implant can be a temporary or even long-term treatment because it improved the disability and function over the long-term without a major progression in the osteoarthritis, function or pain. Long term results of this mini-prosthesis have not been previously reported. LEVEL OF EVIDENCE: IV.
PURPOSE: The aim of this study was to investigate the long-term outcome of the unicompartmental knee resurfacing prosthesis (UniCAP) using clinical and radiographic assessments, and to evaluate the revision and survival rates. METHODS: This was a prospective cohort study of patients with UniCAP prostheses with 6-9 years of follow-up. The clinical examination included the Knee Society Score (KSS) and Visual Analogue Scale (VAS) score. The radiographic examination included the Kellgren-Lawrence (KL) grading scale. A comparison analysis of the clinical preoperative and follow-up data and a Kaplan-Meier survival analysis were performed. RESULTS: Of the 64 UniCAP patients, 36 (56%) were revised and one died. Examinations were performed on 23 (85%) of them. When compared with the preoperative data, the examinations showed a significant increase in the KSS objective [mean = 47.4, standard deviation (SD) = 5.8 vs. mean = 90.0, SD = 6.9] and function (mean = 46.7, SD = 6.8 vs. mean = 91.1, SD = 6.9) scores, a decrease in the VAS-score (mean = 7.3, SD = 0.5 vs. mean = 3.4, SD = 1.4) and a significant increase in the KL medial score (mean = 1.7, SD = 0.6 vs. mean = 2.1, SD = 0.5). The Kaplan-Meier survival rate after 5 years indicated good long-term outcomes. CONCLUSIONS: There was a survival rate of approximately 40% after 9 years of follow-up, but in the group of patients (35-65 years old) not eligible for a final total arthroplasty. These patients were often left with pain and disability. This implant can be a temporary or even long-term treatment because it improved the disability and function over the long-term without a major progression in the osteoarthritis, function or pain. Long term results of this mini-prosthesis have not been previously reported. LEVEL OF EVIDENCE: IV.
Entities:
Keywords:
Cartilage injury; Condylar implant; Early osteoarthritis; Femoral resurfacing; Knee prosthesis; Large cartilage lesions; Small implants
Authors: Ralph M Jeuken; Pieter P W van Hugten; Alex K Roth; Ufuk Tan Timur; Tim A E J Boymans; Lodewijk W van Rhijn; William D Bugbee; Pieter J Emans Journal: Orthop J Sports Med Date: 2021-10-15
Authors: Johannes Holz; Tim Spalding; Tarek Boutefnouchet; Pieter Emans; Karl Eriksson; Mats Brittberg; Lars Konradsen; Clemens Kösters; Peter Verdonk; Magnus Högström; Martin Lind Journal: Knee Surg Sports Traumatol Arthrosc Date: 2020-10-06 Impact factor: 4.114