Should the position of the patellar component replicate the vertical median ridge of the native patella?

The Knee ◽  
2017 ◽  
Vol 24 (1) ◽  
pp. 82-90 ◽  
Author(s):  
Rae Hyeong Lee ◽  
Hae Won Jeong ◽  
Jin Kyu Lee ◽  
Choong Hyeok Choi
Keyword(s):  
Patellar Component ◽  
Median Ridge

scholarly journals Difference in patient-reported outcomes of various patellar component designs in total knee arthroplasty: A randomized clinical study

2021 ◽  
Vol 29 (1) ◽  
pp. 230949902199606
Author(s):  
Takeshi Mochizuki ◽  
Koichiro Yano ◽  
Katsunori Ikari ◽  
Ken Okazaki
Keyword(s):  
Knee Osteoarthritis ◽  
Clinical Effects ◽  
Patellar Component ◽  
American College Of Rheumatology ◽  
Randomized Clinical Study ◽  
Component Design ◽  
Patient Reported ◽  
Total Knee ◽  
The Difference ◽  
And Function

Purpose: This study investigated the clinical effects of different patellar components without being affected by the femoral component design in total knee arthritis (TKA) for patients with knee osteoarthritis (OA). Methods: In total, 48 patients with OA who met the criteria of the American College of Rheumatology for OA were enrolled and randomly assigned in a 1:1 ratio to two groups according to the usage of patellar component design for TKA (medialized dome type [dome group] or medialized anatomic type [anatomic group]). To evaluate the clinical outcomes for TKA, knee range of motion (ROM), pain intensity of 0–100 mm visual analog scale (pain VAS), and the Japanese Knee Osteoarthritis Measure (JKOM) score were obtained at baseline and year 1. Results: The difference in knee ROM, pain VAS, or total JKOM score at year 1 was not significant between the dome and anatomic groups ( p = 0.398, 0.733 and 0.536, respectively). Moreover, similar results were obtained for changes in knee ROM, pain VAS, or total JKOM scores from baseline. In both groups, the pain VAS and total JKOM scores were significantly improved at year 1. Conclusion: Both dome and anatomic groups in TKA are significantly effective for pain and function using the JKOM score. However, their efficacy did not differ, according to the JKOM score. Results of this study are rare information focusing on the patellar component design and provide one of the insights into the TKA clinical management.

CONGENITAL ECTODERMAL DYSPLASIA OF THE FACE

PEDIATRICS ◽  
1963 ◽  
Vol 32 (4) ◽  
pp. 540-548
Author(s):  
Howard Setleis ◽  
Benjamin Kramer ◽  
Marta Valcarcel ◽  
Arnold H. Einhorn
Keyword(s):  
Puerto Rican ◽  
Ectodermal Dysplasia ◽  
Single Gene ◽  
Elderly Person ◽  
Cutaneous Lesions ◽  
Median Ridge ◽  
The Face

Five children are described who have a previously undescribed collection of defects. The children are all of Puerto Rican ancestry. The features of their defects are: (1) an aged, leonine appearance; (2) absent eyelashes from either lid, or multiple rows of lashes on the upper lids with absence of those of the lower lids; (3) eyebrows which slant sharply upward and laterally; (4) scarlike defects on each temple erroneously attributed at first, to obstetrical forceps injury; (5) skin which is puckered around the eyes, as in an elderly person; (6) a scarlike median ridge of the chin; and (7) a nose and chin which seem rubbery when palpated. The temporal defects and abnormalities of the eyelashes are thought to be due to the multiple effects of a single gene. We suggest that this combination of cutaneous lesions limited to the face is probably the expression of an autosomal reccessive inheritance.

scholarly journals Taxonomic notes, a new species, and a key to Indian species of the click beetle genus Cryptalaus Ȏhira, 1967 (Coleoptera: Elateridae: Agrypninae)

2021 ◽  
Vol 13 (13) ◽  
pp. 19985-19999
Author(s):  
Harshad Parekar ◽  
Amol Patwardhan
Keyword(s):  
New Species ◽  
Morphological Characters ◽  
Indian Species ◽  
Male And Female ◽  
Median Ridge ◽  
Click Beetle ◽  
A New Species

Cryptalaus alveolatus sp. nov. is described and illustrated from India. The species has unique morphological characters: conspicuous longitudinal median ridge on pronotum, elytral interstria II more depressed than interstriae I and III. The Indian fauna of the genus Cryptalaus Ȏhira, 1967 is updated and represented by seven species: C. alveolatus sp. nov., C. assamensis (Schwarz, 1902) comb. nov., C. eryx (Candèze, 1874), C. lynceus (Candèze, 1874), C. nodulosus (Waterhouse, 1877) comb. nov., C. sculptus (Westwood, 1848) and C. sordidus (Westwood, 1848). Genitalia and terminalia of male and female C. sordidus are also illustrated. A key to the Indian species of Cryptalaus is given.

FATE OF THE UNREVISED ALL-POLYETHYLENE PATELLAR COMPONENT IN REVISION TOTAL KNEE ARTHROPLASTY

2003 ◽  
Vol 85 (1) ◽  
pp. 56-59 ◽  
Author(s):  
JESS H. LONNER ◽  
MICHAEL A. MONT ◽  
PETER F. SHARKEY ◽  
JOHN M. SILISKI ◽  
AMAR D. RAJADHYAKSHA ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Revision Total Knee Arthroplasty ◽  
Patellar Component ◽  
Total Knee

Evaluation of a 3D-printed total knee arthroplasty using radiostereometric analysis

2019 ◽  
Vol 101-B (7_Supple_C) ◽  
pp. 40-47 ◽  
Author(s):  
S. Sporer ◽  
L. MacLean ◽  
A. Burger ◽  
M. Moric
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Radiostereometric Analysis ◽  
Biological Fixation ◽  
Implant Surface ◽  
Patellar Component ◽  
Patient Reported ◽  
3D Printed ◽  
Total Knee ◽  
Highly Porous

AimsOur intention was to investigate if the highly porous biological fixation surfaces of a new 3D-printed total knee arthroplasty (TKA) achieved adequate fixation of the tibial and patellar components to the underlying bone.Patients and MethodsA total of 29 patients undergoing primary TKA consented to participate in this prospective cohort study. All patients received a highly porous tibial baseplate and metal-backed patella. Patient-reported outcomes measures were recorded and implant migration was assessed using radiostereometric analysis.ResultsPatient function significantly improved by three months postoperatively (p < 0.001). Mean difference in maximum total point motion between 12 and 24 months was 0.021 mm (-0.265 to 0.572) for the tibial implant and 0.089 mm (-0.337 to 0.758) for the patellar implant. The rate of tibial and patellar migration was largest over the first six postoperative weeks, with no changes in mean tibia migration occurring after six months, and no changes in mean patellar migration occurring after six weeks. One patellar component showed a rapid rate of migration between 12 and 24 months.ConclusionBiological fixation appears to occur reliably on the highly porous implant surface of the tibial baseplate and metal-backed patellar component. Rapid migration after 12 months was measured for one patellar component. Further investigation is required to assess the long-term stability of the 3D-printed components and to determine if the high-migrating components achieve fixation. Cite this article: Bone Joint J 2019;101-B(7 Supple C):40–47

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