Unicompartmental Knee Arthroplasty for Spontaneous Osteonecrosis of the Femoral Condyle.

Abstract Background:Spontaneous osteonecrosis of the knee (SONK) can lead to severe knee osteoarthritis predominantly localized to the medial compartment. We aimed to determine whether unicompartmental knee arthroplasty was an effective treatment for primary SONK.Methods:We analyzed the functional outcomes in 23 patients with SONK (with a magnetic resonance imaging [MRI]-confirmed diagnosis) who underwent UKA at a single center. The mean follow-up time was 67 months post-UKA.Results:Significant improvements in function were indicated by reduced Oxford Knee and Visual Analogue Scale scores after UKA, and there were no specific complications after the procedures. The incidence of MRI-identified medial meniscus posterior root tear (MMPRT) was 69.6% (16/23).Conclusion:Unicompartmental arthroplasty for SONK is less destructive to the native knee structure than total knee arthroplasty, but can achieve comparable prognosis with strict patient selection. While the precise etiology of SONK is unknown, one theory posits that a MMPRT may change the biomechanical circumstances of the knee joint, leading to osteonecrosis. Although not confirmatory, the high prevalence rate suggests that MMPRT may have a key role in the development of SONK. UKA is an effective treatment option for SONK, resulting in significant functional improvement. Long-term (>10 years) outcomes should be investigated.

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Medium-term clinical results of unicompartmental knee arthroplasty for the treatment for spontaneous osteonecrosis of the knee with four to 15 years of follow-up

The Knee ◽

10.1016/j.knee.2019.06.007 ◽

2019 ◽

Vol 26 (5) ◽

pp. 1111-1116 ◽

Cited By ~ 3

Author(s):

Shinichi Fukuoka ◽

Kenji Fukunaga ◽

Kei Taniura ◽

Takeharu Sasaki ◽

Kunio Takaoka

Keyword(s):

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Clinical Results ◽

Medium Term ◽

Unicompartmental Knee ◽

Spontaneous Osteonecrosis

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Cruciate ligament force of knees following mobile-bearing unicompartmental knee arthroplasty is larger than the preoperative value

Scientific Reports ◽

10.1038/s41598-021-97655-z ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Kenichi Kono ◽

Hiroshi Inui ◽

Tetsuya Tomita ◽

Darryl D. D’Lima ◽

Takaharu Yamazaki ◽

...

Keyword(s):

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Femoral Condyle ◽

Cruciate Ligament ◽

Three Dimensional ◽

Mobile Bearing ◽

Unicompartmental Knee ◽

Before And After ◽

Highly Correlated ◽

Tibiofemoral Kinematics

AbstractWe analyzed the implantation effects on cruciate ligament force in unicompartmental knee arthroplasty (UKA) and determined whether kinematics is associated with the cruciate ligament force. We examined 16 patients (17 knees) undergoing medial UKA. Under fluoroscopy, each participant performed a deep knee bend before and after UKA. A two-dimensional/three-dimensional registration technique was employed to measure tibiofemoral kinematics. Forces in the anteromedial and posterolateral bundles of both the anterior cruciate ligament (aACL and pACL) and the anterolateral and posteromedial bundles of the posterior cruciate ligament (aPCL and pPCL) during knee flexion were analyzed pre- and post-UKA. Correlations between changes in kinematics and ligament forces post-UKA were also analyzed. Preoperatively, the aACL forces were highly correlated with anteroposterior (AP) translation of the lateral condyles (Correlation coefficient [r] = 0.59). The pPCL forces were highly correlated with the varus–valgus angulation (r = − 0.57). However, postoperatively, the PCL forces in both bundles were highly correlated with the AP translation of the medial femoral condyle (aPCL: r = 0.62, pPCL: r = 0.60). The ACL and PCL forces of the knees post-UKA were larger than those of the knees pre-UKA. Kinematic changes were significantly correlated with the cruciate ligament force changes.

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Lateral Unicompartmental knee arthroplasty for a secondary osteonecrosis of the lateral femoral condyle. A case report

BMC Musculoskeletal Disorders ◽

10.1186/s12891-020-03585-8 ◽

2020 ◽

Vol 21 (1) ◽

Cited By ~ 1

Author(s):

Tao Yang ◽

Huaming Xue ◽

Tong Ma ◽

Tao Wen ◽

Long Xue ◽

...

Keyword(s):

Case Report ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Femoral Condyle ◽

Lateral Femoral Condyle ◽

Unicompartmental Knee ◽

Lateral Unicompartmental Knee Arthroplasty

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Fracture of the Medial Femoral Condyle After Unicompartmental Knee Arthroplasty

The Journal of Arthroplasty ◽

10.1016/j.arth.2008.09.007 ◽

2009 ◽

Vol 24 (7) ◽

pp. 1143.e21-1143.e24 ◽

Cited By ~ 7

Author(s):

Kyung Tae Kim ◽

Song Lee ◽

Kun Ho Cho ◽

Kwan Soo Kim

Keyword(s):

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Femoral Condyle ◽

Medial Femoral Condyle ◽

Unicompartmental Knee

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CLINICAL OUTCOMES AFTER UNICOMPARTMENTAL KNEE ARTHROPLASTY FOR OSTEONECROSIS OF THE KNEE

Acta Ortopédica Brasileira ◽

10.1590/1413-785220212901233328 ◽

2021 ◽

Vol 29 (1) ◽

pp. 12-16

Author(s):

TOMOYUKI KAMENAGA ◽

TAKAFUMI HIRANAKA ◽

YUICHI HIDA ◽

TAKAAKI FUJISHIRO ◽

KOJI OKAMOTO

Keyword(s):

Clinical Outcomes ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Femoral Condyle ◽

Oxford Knee Score ◽

Case Series ◽

Necrotic Lesion ◽

Radiographic Findings ◽

Radiographic Outcomes ◽

Unicompartmental Knee

ABSTRACT Objective: Although the mobile-bearing Oxford unicompartmental knee arthroplasty (OUKA) seems an appropriate procedure to treat spontaneous osteonecrosis of the knee (SONK), aseptic tibial component loosening was the leading cause for medial UKA failure. This study aimed to observe short-term and midterm clinical outcomes following OUKA and determine whether tibial lesion affects the procedure clinical and radiographic outcomes. Methods: Sixty patients (mean age 73.1 ± 6.6 years) diagnosed with SONK in the medial femoral condyle and treated with OUKA were separated into two groups using T1-weighted preoperative magnetic resonance imaging (MRI): group F (necrotic lesion confined to the femur) and group T (necrotic lesion spread to the tibia). The Oxford Knee Score (OKS), maximum flexion angle (MFA), and radiographic findings (radiolucent line and subsidence) were compared between the two groups using unpaired t-test. Results: Both groups showed significant improvement in OKS and MFA values at the final follow-up, but without significant differences in the clinical and radiographic outcomes. Conclusion: OUKA is a reliable treatment procedure for SONK in the short and midterm. The presence of tibial lesions on preoperative MRI does not affect postoperative radiographic and clinical outcomes. Level of Evidence IV, Case Series.

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A Retrospective Review of Unicompartmental Knee Arthroplasty Functional Outcome and the Incidence of Medial Meniscus Posterior Root Tear in Spontaneous Osteonecrosis of the Knee

10.21203/rs.3.rs-70036/v1 ◽

2020 ◽

Author(s):

PO-JU WU ◽

TsungYu Lin ◽

Yung Chang Lu

Keyword(s):

Effective Treatment ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Medial Meniscus ◽

Functional Improvement ◽

Posterior Root ◽

Root Tear ◽

Posterior Root Tear ◽

Unicompartmental Knee ◽

Spontaneous Osteonecrosis

Abstract Background: Spontaneous osteonecrosis of the knee (SONK) can lead to severe knee osteoarthritis predominantly localized to the medial compartment. We aimed to determine whether unicompartmental knee arthroplasty was an effective treatment for primary SONK.Methods: We analyzed the functional outcomes in 23 patients with SONK (with a magnetic resonance imaging [MRI]-confirmed diagnosis) who underwent UKA at a single center. The mean follow-up time was 67 months post-UKA.Results: Significant improvements in function were indicated by reduced Oxford Knee and Visual Analogue Scale scores after UKA, and there were no specific complications after the procedures. The incidence of MRI-identified medial meniscus posterior root tear (MMPRT) was 69.6% (16/23). Conclusion: Unicompartmental arthroplasty for SONK is less destructive to the native knee structure than total knee arthroplasty, but can achieve comparable prognosis with strict patient selection. While the precise etiology of SONK is unknown, one theory posits that a MMPRT may change the biomechanical circumstances of the knee joint, leading to osteonecrosis. Although not confirmatory, the high prevalence rate suggests that MMPRT may have a key role in the development of SONK. UKA is an effective treatment option for SONK, resulting in significant functional improvement. Long-term (>10 years) outcomes should be investigated.

Download Full-text