Research on the Wear Performance of Artificial Knee Joint with Different Geometric Dimension

Summary Aim: Multiple procedures for the quantification of activity leakage in radiation synovectomy of the knee joint have been described in the literature. We compared these procedures considering the real conditions of dispersion and absorption using a corpse phantom. Methods: We simulated different distributions of the activity in the knee joint and a different extra-articular spread into the inguinal lymph nodes. The activity was measured with a gammacamera. Activity leakage was calculated by measuring the retention in the knee joint only using an anterior view, using the geometric mean of anterior and posterior views, or using the sum of anterior and posterior views. The same procedures were used to quantify the activity leakage by measuring the activity spread into the inguinal lymph nodes. In addition, the influence of scattered rays was evaluated. Results: For several procedures we found an excellent association with the real activity leakage, shown by an r² between 0.97 and 0.98. When the real value of the leakage is needed, e. g. in dosimetric studies, simultaneously measuring of knee activity and activity in the inguinal lymph nodes in anterior and posterior views and calculation of the geometric mean with exclusion of the scatter rays was found to be the procedure of choice. Conclusion: When measuring of activity leakage is used for dosimetric calculations, the above-described procedure should be used. When the real value of the leakage is not necessary, e. g. for comparing different therapeutic modalities, several of the procedures can be considered as being equivalent.

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Load-Bearing in the Ovine Medial Tibial Condyle: Effect of Meniscectomy

Veterinary and Comparative Orthopaedics and Traumatology ◽

10.1055/s-0038-1633027 ◽

1993 ◽

Vol 06 (02) ◽

pp. 100-104 ◽

Cited By ~ 8

Author(s):

D. M. Pickles ◽

C. R. Bellenger

Keyword(s):

Knee Joint ◽

Contact Area ◽

Mammalian Species ◽

Total Removal ◽

Load Bearing ◽

Human Knee ◽

Biochemical Effects ◽

Pressure Sensitive ◽

Medial Meniscectomy ◽

Tibial Condyle

SummaryTotal removal of a knee joint meniscus is followed by osteoarthritis in many mammalian species. Altered load-bearing has been observed in the human knee following meniscectomy but less is known about biochemical effects of meniscectomy in other species. Using pressure sensitive paper in sheep knee (stifle) joints it was found that, for comparable loads, the load-bearing area on the medial tibial condyle was significantly reduced following medial meniscectomy. Also, for loads of between 50 N and 500 N applied to the whole joint, the slope of the regression of contact area against load was much smaller. Following medial meniscectomy, the ability to increase contact area as load increased was markedly reduced.The load bearing area on the medial tibial condyle was reduced following meniscectomy.

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Combined Method for Treating Severe Recurrent Post Burn Flexion Contracture of the Knee Joint: Free Flap and Ilizarov Apparatus

Journal of Reconstructive Microsurgery ◽

10.1055/s-2006-949025 ◽

2006 ◽

Vol 22 (04) ◽

Author(s):

Batia Yaffe ◽

Eyal Winkler ◽

Nir Scher ◽

Michael Berenstein ◽

Amos Schindler

Keyword(s):

Knee Joint ◽

Free Flap ◽

Flexion Contracture ◽

Combined Method ◽

Ilizarov Apparatus

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The Effects of Prolotherapy on Knee Joint Pain due to Ligament Laxity

The Korean Journal of Pain ◽

10.3344/jkps.2004.17.1.47 ◽

2004 ◽

Vol 17 (1) ◽

pp. 47 ◽

Cited By ~ 4

Author(s):

Daehyun Jo ◽

Myounghee Kim

Keyword(s):

Knee Joint ◽

Joint Pain ◽

Ligament Laxity

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The Analysis of Proprioception Alteration during First Five Months after Anterior Cruciate Ligament Reconstruction

Baltic Journal of Sport and Health Sciences ◽

10.33607/bjshs.v1i84.293 ◽

2018 ◽

Vol 1 (84) ◽

Author(s):

Vilma Jurevičienė ◽

Albertas Skurvydas ◽

Juozas Belickas ◽

Giedra Bušmanienė ◽

Dovilė Kielė ◽

...

Keyword(s):

Anterior Cruciate Ligament ◽

Angular Velocity ◽

Knee Joint ◽

Cruciate Ligament ◽

Position Sense ◽

Joint Position Sense ◽

Joint Position ◽

Starting Position ◽

Angular Velocities ◽

Anterior Cruciate

Research background and hypothesis. Proprioception is important in the prevention of injuries as reduced proprioception is one of the factors contributing to injury in the knee joint, particularly the ACL. Therefore, proprioception appears not only important for the prevention of ACL injuries, but also for regaining full function after ACL reconstruction.Research aim. The aim of this study was to understand how proprioception is recovered four and five months after anterior cruciate ligament (ACL) reconstruction.Research methods. The study included 15 male subjects (age – 33.7 ± 2.49 years) who had undergone unilateral ACL reconstruction with a semitendinosus/gracilis (STG) graft in Kaunas Clinical Hospital. For proprioceptive assessment, joint position sense (JPS) was measured on both legs using an isokinetic dynamometer (Biodex), at knee flexion of 60° and 70°, and at different knee angular velocities of 2°/s and 10°/s. The patients were assessed preoperatively and after 4 and 5 months, postoperatively.Research results. Our study has shown that the JPS’s (joint position sense) error scores to a controlled active movement is significantly higher in injured ACL-deficient knee than in the contralateral knee (normal knee) before surgery and after four and five months of rehabilitation. After 4 and 5 months of rehabilitation we found significantly lower values in injured knees compared to the preoperative data. Our study has shown that in injured knee active angle reproduction errors after 4 and 5 months of rehabilitation were higher compared with the ones of the uninjured knee. Proprioceptive ability on the both legs was independent of all differences angles for target and starting position for movement. The knee joint position sense on both legs depends upon the rate of two different angular velocities and the mean active angle reproduction errors at the test of angular velocity slow speed was the highest compared with the fast angular velocity. Discussion and conclusions. In conclusion, our study shows that there was improvement in mean JPS 4 and 5 months after ACL reconstruction, but it did not return to normal indices.Keywords: knee joint, joint position sense, angular velocity, starting position for movement.

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