The selection of the prosthetic material determine the success or failure of hip arthroplasty. Currently, the metals, ceramics, polymer composites and carbon materials are the main prosthetic materials of artificial hip joint. They have some progresses in biocompatibility, elastic modulus,mechanical properties, useful life, but they still can't reach the ideal standard of design. In this essay, we mainly review the characteristics and applications of the current artificial hip joint materials through its classification in order to provide a reference for choosing appropriate hip joint materials in clinic and increasing characteristic of materials. We consider the polymer composites has more advantages such as biocompatibility, mechanical properties, corrosion resistance and price, even if it has shortages in abrasion resistance. As the researches of polymer composites are main focus on abrasion resistance, articular surface and strength,and its performances are increased fast, it has a wide prospect in future.
Animals ; Hip Dislocation ; surgery ; Hip Prosthesis ; standards ; utilization ; Humans

Adolescent ; Adult ; Child ; Clavicle ; injuries ; physiopathology ; surgery ; External Fixators ; Female ; Fractures, Bone ; pathology ; physiopathology ; surgery ; Humans ; Male ; Manipulation, Orthopedic ; methods ; Middle Aged ; Young Adult

Adult ; Carpal Bones ; injuries ; External Fixators ; Female ; Humans ; Joint Dislocations ; therapy ; Lunate Bone ; injuries ; Male ; Manipulation, Orthopedic ; methods ; Middle Aged ; Scaphoid Bone ; injuries ; Wrist Injuries ; therapy

BACKGROUND:The research and application of platelet-rich plasma in tissue regeneration and restoration have always been an issue of concern in the medicine and bioengineering fields.OBJECTIVE:To analyze the effects of platelet-rich plasma in combination with tendon stem cells on histomorphology change and matrix metalloproteinase 1 expression of the tendon tissues in a rabbit model of Achilles tendinopathy.METHODS:Forty New Zealand white rabbits were randomly divided into model group (n=32) and blank control group (n=8).In the model group,the animals were injected about 2 cm distant to the attachment point of the left calcaneus with prostaglandin E2 (once a week,for totally 4 weeks) to make the animal model of tendinopathy.The rabbits in the blank control group were injected the equal amount of normal saline.After 4 weeks,model rabbits were randomly divided into four subgroups:combination group,tendon stem cell group,platelet-rich plasma group and model control group,with eight rabbits in each group.Platelet-rich plasma and tendon stem cells,alone or in combination,and normal saline were injected into the corresponding group,twice with an interval of 3 weeks.At 6 weeks after injection,the tendon tissue was collected and stained for histological examination and detection of matrix metalloproteinasa 1 expression.RESULTS AND CONCLUSION:(1) Hematoxylin-eosin staining:the tendon fibers in the combinationgroup were intact and arranged orderly;in the tendon stem cell group,the tendon fibers were almost arranged orderly despite some fractured fibers;in the platelet-rich plasma group,fiber breakage and loose fiber structure were observed;in the model control group,there were no intact tendon fibers,with the presence of inflammatory cell filtration.(2) Masson staining:The tendon fibers in the combination group had slight wave-shaped changes but the fibers were not cut off;in the tendon stem cell group,the tendon fibers were slightly in disorder,but with the intact structure,and obvious inflammatory cell filtration was observed;in the platelet-rich plasma group,fiber breakage,reduced collagen fibers and inflammatory cell filtration were obviously observed;in the model control group,there were no intact tendon fibers,and inflammatory cell filtration was clearly visible.(3) The expression of matrix metalloproteinase 1:Compared with the blank control group,the expression of matrix metalloproteinase 1 was significantly higher in the other groups except the combination group (P ＜ 0.05).There was no significant difference in the expression of matrix metalloproteinase 1 between the combination group and blank control group (P ＞ 0.05).To conclude,the combination of platelet-rich plasma and tendon stem cells can inhibit the vicious cycle of degeneration of collagen and extracellular matrix,reduce the expression of matrix metalloproteinase 1 in tenocytes,and delay inflammation responses and degeneration due to tendinopathy.

Adult ; Aged ; Aged, 80 and over ; Colles' Fracture ; therapy ; Combined Modality Therapy ; External Fixators ; Female ; Humans ; Male ; Manipulation, Orthopedic ; methods ; Middle Aged

OBJECTIVETo investigate effect of particle size on oral absorption of silymarin-loaded solid lipid nanoparuicles.

METHODSolid lipid nanoparticles (SLN) of various sizes (150 nm, 500 nm and 1000 nm) using Compritol 888 ATO as the material and silymarin (SM) as a model drug were prepared. Silybinin concentration in plasma of rats were determined by RP-HPLC with UV detector. The main pharmacokinetic parameters were calculated by 3p97.

RESULTResults showed that the AUC of 150 nm SLN was 2.08 fold that of 500 nm SLN and 2.54 fold of 1000 nm SLN treated orally to rats (P < 0.05). The oral bioavailability of 150 nm SLN was remarkably higher than the other two size SLN.

CONCLUSIONThis has important implications in designing of SM-SLN as a new oral drug delivery system.

Administration, Oral ; Animals ; Area Under Curve ; Biological Availability ; Drug Carriers ; Drug Delivery Systems ; Excipients ; Fatty Acids ; Female ; Male ; Milk Thistle ; chemistry ; Nanostructures ; Particle Size ; Plants, Medicinal ; chemistry ; Rats ; Rats, Sprague-Dawley ; Silymarin ; administration & dosage ; isolation & purification ; pharmacokinetics

OBJECTIVETo compare clinical effects and the incidence rates of cubitus varus in displaced humeral supracondylar fractures treated with different kinds of external fixation.

METHODSAmong 226 children with displaced humeral supracondylar fractures, 134 patients were male and 92 patients were female, ranging in age from 5 to 12 years, with an average of 8.58 years. After manipulative reduction, the patients were treated with three kinds of external fixation: the 88 patients (51 males and 37 females, ranging in age from 5.1 to 12 years) in Group A were treated with double external fixations of small splint and moulding splint; 74 patients (44 males and 30 females, ranging in age from 5 to 11.8 years) in Group B were treated with small splint; and 64 patients (39 males and 25 females, ranging in age from 5.5 to 12 years) in Group C were treated with plaster slab. The indexes such as healing time of fractures, the functions of elbow joint and cubitus varus were observed. The clinical effects and the incidence rates of cubitus varus in three groups were compared.

RESULTSAll the patients were followed-up, and the duration of follow-up ranged from 6 months to 4 years, with an average of 25 months. According to the standard for efficacy evaluation, in Group A, 59 patients got an excellent result, 23 good, 6 bad, the excellent and good rate was 93.18%; in Group B, above data were 37, 29, 8, 89.19% respectively; while in Group C, the data were 20, 31, 13 and 79.69% respectively. The incidence rates of cubitus varus of three groups were 6.82%, 17.57% and 32.81% respectively. The result of statistical analysis demonstrated that there were significant differences of the clinical effects and the incidence rates of cubitus varus in three groups (P<0.05). Comparison of the clinical effects: Group A was better than Group B and Group C, Group B was better than Group C. The incidence rates of cubitus varus: Group A was lower than Group B and Group C, Group B was lower than Group C.

CONCLUSIONThe therapeutic effects of double external fixation is the best among three groups. The double external fixation had follow advantages: external fixation, high stability, strong anti-rotation ability, and joint function quick recovery, the incidence rates of cubitus varus lower and good clinical effects. So double external fixation method should be the first choose for the treatment of humeral supracondylar fractures.

Child ; Child, Preschool ; Female ; Fracture Fixation ; methods ; Humans ; Humeral Fractures ; surgery ; Male ; Manipulation, Orthopedic ; Splints

OBJECTIVETo evaluate clinical effects of knee osteoarthritis with the treatment of the isometric quadriceps femoris contraction exercises, which aims at establishing the exercise prescription of knee osteoarthritis,and promoting its clinical application.

METHODSFrom January 2008 to September 2010, 120 patients with knee osteoarthritis were divided into two groups according to visiting sequence, including 39 males and 81 females, ranging in age from 40 to 85 years, with an average of 62.50 years, the disease course ranged from 1 month to 30 years. There were 60 patients in the therapeutic group, including 21 males and 39 females, ranging in age from 40 to 85 years, with an average of (62.27 +/- 8.99) years, the disease course ranged from 2 months to 30 years; and the patients were treated with intra-articular injection of sodium hyaluronate and isometric quadriceps femoris contraction exercises for treatment. There were 60 patients in the control group; including 18 males and 42 females, ranging in age from 41 to 80 years, with an average of (62.72 +/- 8.34) years, the disease course ranged from 1 month to 30 years; and the patients were treated with conventional intra-articular injection of sodium hyaluronate. The index such as the pains,functions and articular dropsy of the knees were observed and the clinical effects were compared respectively.

RESULTSAll the patients were followed up, and the duration ranged from 1 to 3 years, with an average of 18 months. According to standard of JOA about evaluating the therapeutic effects of knee osteoarthritis: in the therapeutic group, 12 patients got an excellent result, 33 good, 14 poor and 1 bad; and in the control group, 7 patients got an excellent result, 14 good, 31 poor and 8 bad. The clinical results of therapeutic group was better than that of control group. There were 7 recurrent cases in the therapeutic group and 31 recurrent cases in the control group; the recurrence rate in therapeutic group was lower than that of control group.

CONCLUSIONThe isometric quadriceps femoris contraction exercises has obvious effect in alleviating the symptoms, improving joint function, strengthening the joint stability and slowing down joint degeneration process for the treatment of knee osteoarthritis, which has a good effect in the long-term clinical effects.

Adult ; Aged ; Aged, 80 and over ; Case-Control Studies ; Exercise Therapy ; Female ; Humans ; Hyaluronic Acid ; administration & dosage ; Isometric Contraction ; Male ; Middle Aged ; Osteoarthritis, Knee ; therapy

Objective To evaluate the safety of influenza vaccine and 23-valent pneumococcal polysaccharide vaccine (PPV23) immunized alone or in combination in elderly people and to raise the awareness of vaccine safety among the elderly. Methods From October 2014 to September 2015,454 eld-erly people who were over 60 years old and immunized with influenza vaccine and PPV23 alone or in combi-nation were recruited in this study and divided into five groups. Local and systemic reactions occurred within one month after vaccination were recorded. Results (1) Incidences of adverse reactions among all subjects and people vaccinated with influenza vaccine alone,domestic PPV23 alone,imported PPV23 alone,domes-tic PPV23 combined with influenza vaccine and imported PPV23 combined with influenza vaccine were 10.13%,5.35%,11.63 %,9.52%,17.24% and 12.63%,respectively. Local reaction,injection site pain and mild reaction were the common reactions to vaccination. All reactions occurred within seven days and most of them occurred within 30 minutes to one day after vaccination(82.61%). All subjects recovered within seven days and most of them recovered within one day (84.78%). (2) Compared with the people immunized with domestic or imported PPV23 or influenza vaccine alone,those immunized in combination had higher incidences of reactions to vaccination. Among the three single vaccination groups, domestic PPV23 group had the highest incidence of reactions,followed by imported PPV23 and influenza vaccine groups,but no significant difference was found among them(P>0.05). The incidence of responses to influenza vaccine combined with domestic PPV23 was higher than that to influenza vaccine combined with imported PPV23, but no significant difference was found between them (P>0.05). (3) In each group,women,people aged≥70 years or with chronic diseases had a higher incidence of responses to vaccination than men,people aged 60 to 69 years or without chronic diseases,respectively (P>0.05). Conclusion Immunization with influ-enza vaccine and PPV23 alone or in combination is safe and tolerable in elderly people regardless of gender, age,or whether they are suffering from chronic diseases or not. Both domestic and imported PPV23 have the feature of good safety.

Objective To evaluate the risks of vaccination operation in order to provide scientific basis for policy makings of vaccination operation.Methods The risk matrix and analytic hierarchy process approach were used to evaluate the risks of vaccination operation,including the possibility,severity,risk weight,and risk level.Results Seven items for the first level and thirty one items for the second level vaccination risk factors were determined.In the first level,E level risk (Extremely serious risk ) was vaccination implementation risk,and H level risk (high risk ) was the risks of pre -notification and health education and risks of vaccine and cold chain management.Vaccination implementation risk accounted the largest weight (weight coefficient=38.95%).In second level,E level risk was three inspection and seven verification before vaccination,and H level risk were personnel professional quality,personnel responsibility,pre -inspection,informed before vaccination, vaccination route, site and dose, vaccination operation, post vaccination notification and retention,and three inspection and seven verification before vaccination,accounted the largest weight (weight coefficient=10.14%).The weight of the logical consistency of the test results were satisfactory (consistency ratio<0.1 ).Conclusion The integrated application of risk matrix and analytic hierarchy process in risk assessment of vaccination operation helps to further regulate vaccination services and has application and promotion value.