Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Prosthesis Fitting”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 91 records · Page 5Linked to original sources

A new method for achieving passive fit of an interim restoration supported by Brånemark implants: a technical note.

When carrying out restorations supported by dental implants, it is advisable to have a temporary method that offers the possibility of evaluating and/or creating a proper emergence profile, peri-implant health, occlusion, esthetics, acceptable phonetic response, and hygiene, as well as one that facilitates progressive loading of the implants during the bone maturation period. To maintain osseointegration it is essential that a prosthesis fit with total passivity, since the lack of a periodontal ligament renders the implant unable to modify its position. Gold cylinders for EsthetiCone abutments, which were modified following a previously reported technique, were used so that provisional prostheses could be fixed to the cylinders in the mouth by means of an alternative cementing technique. By this way, a provisional prosthesis with total circumferential fit, maintaining the option of retrieval, could be routinely obtained.

Acrylic Resins↗

A photoelastic clinical study of the static load distribution at the stump/socket interface of PTB sockets.

It is recognized that the assessment of prosthetic socket fit is based largely on the subjective clinical judgement of the prosthetist. This study assesses a novel technique, photoelasticity, for use as a tool for the qualitative and quantitative assessment of socket fit. Photoelasticity is a visual technique that produces contours of principal stress or strain differences. The colour and/or distance between the contours can be qualitatively or quantitatively assessed, using a polariscope, to give a full-field analysis of the stresses on the sockets's surface. This paper presents qualitative photoelastic socket surface contour data gathered during several prosthesis fitting sessions for two male trans-tibial amputees. Results are compared with the actual known contact regions at the stump/socket interface to determine if a relationship exists. This comparison of results has then been used to conclude the suitability of photoelasticity as a tool for the assessment of socket fit and recommendations are made as to the future developments of the technique. A direct relationship between the stump/socket contact regions and the qualitative photoelastic contours was demonstrated. Given further development this photoelastic technique may therefore be suitable for qualitative analysis of the interactions between the stump and prosthetic socket.

Aged↗

Forearm musculofasciocutaneous flap to cover glenohumeral arthrodesis hardware during reconstruction of the flail upper extremity.

SUMMARY: For selected patients with flail upper extremities after brachial plexus injury, glenohumeral arthrodesis, above-the-elbow amputation, and fitting of an above-the-elbow prosthesis are effective reconstructive options. In such situations, soft-tissue thinning at the shoulder, especially deltoid atrophy, presents the potential problem of shoulder fusion hardware causing pain or even eroding overlying soft tissue. The authors have used a pedicled forearm musculofasciocutaneous flap, elevated just before above-the-elbow amputation and subsequently transposed to the shoulder, to provide high-quality soft-tissue coverage of the arthrodesis hardware. Preliminary results with three patients suggest that this procedure may be useful for preventing tenderness and breakdown of tissue overlying glenohumeral arthrodesis hardware. In all three patients, the forearm flap remained well perfused, and all wounds healed fully with no subsequent problems with skin breakdown. All three patients had long-term benefit from prosthesis fitting.

Adult↗

Children with congenital deficiencies or acquired amputations of the lower limbs: functional aspects.

The aim of the study was to evaluate the use of prostheses, some secondary complications and functional aspects among children who had a congenital leg deficiency or an acquired leg amputation. Rehabilitation physicians were asked to refer children, aged 1-18 years, with a leg deficiency or amputation. Mentally retarded children, children who had only had a toe amputated and children within one year after amputation were excluded. A total of 88 children were included; 64 with a congenital deficiency and 24 with an acquired amputation. In 25 of these 88, both legs were affected; 28 children also had an arm deficiency or amputation. A structured interview was held and the Child-HAQ assessed. Five (5) questions from the Child-HAQ, all relating to leg functions, were analysed. All but 7 children had had a prosthesis fitted, most (89%) using it for almost the entire day. In the children with congenital deficiencies, the first prosthesis had been fitted at an average age of approximately 18 months. Four (4) of the 7 children without prostheses used orthopaedic footwear. The 10 children with congenital deficiencies necessitating prostheses with articulated knees had the first knee of this type fitted at an average age of approximately 37 months. Forty-seven (47) of the 88 children had needed one or more (secondary) operations. In the children with congenital deficiencies, this was usually a conversion procedure, while the children with an acquired amputation had usually been operated on for osseous overgrowth. Twenty (20) of the 88 children experienced or had previously experienced phantom sensations, 5 children phantom pain. Skin problems were common. Most children (95%) were able to walk, most of them (93%) more than 100 m and 93% of the children aged 4 years or over were able to cycle. Most children (94%) aged 6 years or over were able to don and doff their prostheses independently. Some 90% of the children aged 4 years or over attended a normal primary or secondary school. Most (93%) of the children were able to take part in the physical education programme at school, although frequently (47%) with some degree of difficulty. The functional abilities of 88 Dutch children with congenital leg deficiencies or leg amputations were found to be generally satisfactory. Most of the children used prostheses in their daily activities. Secondary complications were, however, frequent.

Adolescent↗

Bilateral lower limb amputations as a result of landmine injuries.

Landmine explosions cause most of the war injuries in the battlefield. Amputations resulting from severe injuries reveal serious problems despite the improvements in surgery. Bilateral lower limb amputations have more impact than unilateral on social life. Some 29 cases with lower limb amputations due to landmine injuries were treated in the Department of Orthopaedics and Traumatology, Gülhane Military Medical Academy between January 1992 and December 1996. Amputation levels were as follows: 1 case had hip disarticulation and a trans-femoral amputation, 6 had bilateral trans-femoral amputations, 6 had trans-femoral and trans-tibial amputations, 12 had bilateral trans-tibial amputations, 1 had trans-femoral and Chopart amputations and the remaining 3 cases had trans-tibial and Chopart amputations. The initial treatment was done for all cases in the first 6-8 hours after injury at the field hospitals. Aggressive debridement, excision and primary closure were performed. None of the stumps required reamputations and/or revision. No case had gas gangrene or tetanus. Postoperative, pre-prosthetic training programme which ranged between 30-120 days with an average 48 days; and prosthesis fitting and adequate post-prosthetic training programme which ranged 32-126 (average 94) days was applied. All the cases were followed-up with a mean of 38.5 months (14-72 months). Nine (9) cases (31%) returned to their previous occupation, while 20 (69%) cases had to change their jobs.

Adult↗

Women's satisfaction with their breast prosthesis: what determines a quality prosthesis?

The aim of this study is to determine what factors constitute a quality prosthesis and ascertain which factors affect prosthesis satisfaction. Sixty-four women who received full funding for their prosthesis and 38 women who received their hospital's usual funding were recruited. Women rated the information provided about breast prostheses very highly, with 85% reporting that it was "very good" or "excellent." Satisfaction was significantly associated with how well the prosthesis fit (1 week, p = .001; 3 months, p = .01), level of comfort (3 months, p=.005), and appearance of the prosthesis when worn (6 months, p = .001). Quality was significantly associated with how well it fit (1 week, p = .001; 3 months, p = .001), how natural it felt (1 week, p = .001; 6 months, p = .01), the weight of the prosthesis (3 months, p = .003), and appearance when worn (6 months, p = .03). The results will be used to improve women's access to a quality prosthesis.

Adult↗

Healing of open stump wounds after vascular below-knee amputation: plaster cast socket with silicone sleeve versus elastic compression.

OBJECTIVE: To assess the effect of a plaster cast socket on the healing of open wounds and on temporary prosthesis fitting after below-knee amputation because of arterial occlusive disease. DESIGN: Randomized controlled trial. SETTING: Rehabilitation center, university hospital. PATIENTS: All included patients had undergone recent (in the previous 3 months) below-knee amputation because of arterial disease and initially had an open stump. Patients were randomly assigned to two groups of 28 subjects each. The sizes of the amputation scars were 8 to 24 cm2. Ischemia of the stump was eliminated as a probable cause of delayed wound healing by the inclusion criterion of transcutaneous oxygen tension (TcPO2) of >35 mmHg. The average age in group I (the experimental group) was 65.2 +/- 12.4 (SD) years and in group II (the control group) 66.8 +/- 10.8 years (not significant). INTERVENTION: A plaster cast (supracondylar-type) socket was fitted on the stumps of group I patients, interposed with a silicone sleeve. The patients were gradually trained to wear this cast for up to 5 hours a day. They were provided with elastic compression bandages for the remainder of the time. Patients in group II wore elastic compression bandages, which were only removed for dressing changes. MAIN OUTCOME MEASURES: Time required for stump healing, length of time between amputation and ability to walk wearing a contact socket, and length of hospital stay. RESULTS: Group I had a quicker average healing time (71.2 +/- 31.7 [SD] days compared to the control group's 96.8 +/- 54.9 days) and a shorter average length of hospital stay (99.8 +/- 22.4 days compared to the control group's 129.9 +/- 48.3 days). CONCLUSION: Use of a plaster cast socket leads to more rapid healing of the open stump and to a shorter hospitalization. If there is no stump ischemia, this plaster cast technique is safe.

Aged↗

The functional demands on the intact limb during walking for active trans-femoral and trans-tibial amputees.

The aim of this study was to investigate the loading demands placed on the intact limb in terms of joint moments and power for active trans-femoral and trans-tibial amputees in comparison to a group of able-bodied subjects. Four (4) trans-tibial, 4 trans-femoral amputees and 10 able-bodied subjects walked at 1.2m.s(-1) along a walkway whilst kinematic data from both the intact and prosthetic limbs, and kinetic data from the intact limb only were collected. A Panasonic VHS video camera was used to film subjects walking in the sagittal plane with simultaneous force data collected from a Kistler force platform. The amputees were found to compensate for the functional loss of one or more joints by increasing net joint moments and power output on their intact limb compared to able-bodied subjects. At the intact limb ankle, the range of motion, peak dorsiflexor moment and power generation at toe-off increased. At the intact limb knee, power generation during stance and extensor moments and power absorption at toe-off increased. At the intact limb hip, extensor moment and power absorption during stance, and hip flexor moment and power generation at toe-off increased. These findings were partly attributed to the prostheses used but mainly to adaptation mechanisms displayed by trans-femoral and trans-tibial amputees. They have implications for the mobility of amputees and the long term health of their joints. It was recommended that prosthesis design, prosthesis fitting and training in the use of the prosthesis were all factors which could be investigated with a view to minimising intact limb loading.

Adult↗

Hemolysis, high-intensity transient signals (HITS) and hemodynamic results after aortic valve replacement with the Medtronic Hall Easy-Fit heart valve prosthesis.

BACKGROUND AND AIM OF THE STUDY: Previous studies have shown a correlation between type, orientation and valve size of mechanical heart valve prostheses and the incidence of high-intensity transient signals (HITS). The study aim was to investigate the presence of HITS and hemolysis and the impact of valve size and hemodynamic parameters following aortic valve replacement (AVR) using the new Medtronic Hall Easy-Fit prosthesis. METHODS: A total of 150 patients (120 males, 30 females; mean age 62 +/- 8 years; range: 32-78 years) underwent AVR (n = 94; 63% concomitant procedures) with the Easy-Fit valve in its optimal orientation. Patients were investigated at between three and 36 months after AVR using transcranial Doppler examination of the right and left middle cerebral artery, and the incidence of HITS was determined. For evaluation of hemolysis, serum lactate dehydrogenase (LDH), hemoglobin and bilirubin were measured. These parameters were related to valve size. Transthoracic echocardiography was performed in all patients. RESULTS: Among the patients, 112 (75%) showed no or low HITS (34% none, 41% < 30/h), while only 38 (25%) had elevated HITS (range 31-100/h, 14%; range > 100/h, 11%). Statistical analysis showed a linear association between the HITS count and valve size. A positive correlation between valve size and LDH was observed; hemoglobin and bilirubin showed normal values. CONCLUSION: The valve size-dependent increase in LDH after AVR corresponds with the observation that the presence of HITS increases with valve size. In light of these findings, the surgical approach to implant the largest size Easy-Fit valve possible should be discussed, given the excellent hemodynamic results provided by the valve, even in smaller sizes.

Adult↗

Humeral head size in shoulder arthroplasty: a kinematic study.

Changes in kinematics after hemiarthroplasty of the glenohumeral joint were investigated in nine cadaveric specimens. During experiments the influence of the humeral head size on glenohumeral kinematics was evaluated. A modular prosthesis with five different head sizes and press-fit stems was used. Three-dimensional kinematic measurements during abduction and adduction from 0 degree to 70 degrees showed increased external rotation with increasing head size. Small prosthetic heads translated inferiorly and large prosthetic heads superiorly compared with the intact humeral head. During forced anterior and posterior translation the mobility is restricted with increasing head size. This study found that when a press-fit prosthesis is used, it takes 1.25 times the volume of the intact humeral head to reconstruct the kinematics of the glenohumeral joint.

Aged↗

Full-arch implant framework casting accuracy: preliminary in vitro observation for in vivo testing.

PURPOSE: Conventional techniques for implant metal framework fabrication produce error of a magnitude that is inconsistent with the passive-fit requirement for osseointegrated implants. To understand the correlation between prosthesis fit and the implant-tissue response, evaluation of the interface tissue reactions to customary levels of fit is required. The purpose of this study is to determine the accuracy of torch casting full arch frameworks using a high palladium alloy and a ringless phosphate-bonded investment technique. MATERIALS AND METHODS: Three different variables were considered relative to casting accuracy effect. The first variable, completeness of mold-fill, compared cast specimens where the entire sprue system was filled as part of the casting and cast specimens without the sprue system filled. The second variable, phosphate-bonded investment special liquid concentrations, compared groups of castings produced from 0%, 12%, 25%, and 50% special liquid. The third variable, investment mold shape, compared casting produced from a conventional ringless mold shape with a modified ringless mold shape where the investment in the same horizontal plane as the pattern was equal in thickness at the internal and external surfaces. Horizontal and vertical distances on the wax pattern and resulting framework were measured using a machinists microscope to determine casting error. Combined vertical and horizontal error was used for comparison between groups (one-way analysis of variance). RESULTS: No significant differences existed among the three groups compared (P > 0.05). The mean error comparison between the complete and incomplete mold-fill groups showed no statistical difference, while the incomplete fill group was found to be more porous. The mean error of all groups (0.130 mm) exceeded the recommended level of fit needed to satisfy the passive fit requirement by more than 10-fold. CONCLUSIONS: These results verify clinical observation and suggest that the use of conventional lost wax casting technique to cast one-piece full arch implant frameworks is both imprecise and inaccurate as judged against the passive fit requirement. The consequences of screw-fastening misfitting prostheses to osseointegrated implants is currently under investigation.

Analysis of Variance↗

Fitting a temporomandibular joint prosthesis to the skull.

Fitting a temporomandibular joint (TMJ) prosthesis to the skull by using stock prostheses seems to be an appropriate method. However, fitting the skull with one stock part requires many differently shaped parts. Therefore, we fitted the skull with two connected stock parts. The aim of the study was to test whether it is possible to achieve a close fit to the skull with this design, with a maximum of 10 different parts. The articular eminence was fitted with a gully-shaped fitting member, which was rotationally connected to a basic part that fitted to the lateral side of the TMJ. The relevant dimensions of 20 dry skulls were measured and the results were used to derive the optimal dimensions of the prosthesis parts. Prototypes were subsequently fabricated. The fit of the prototypes was tested by measuring the maximum gap between fitting member and skull. All skulls could be fit with a set of four different basic parts and three different fitting members. The average maximum gap between fitting member and skull was 0.20 mm (range 0.11-0.43 mm). It was concluded that a close fit to the skull can be achieved with two connected stock parts and with a total number of seven parts.

Feasibility Studies↗

Lack of complications of the hydroxyapatite orbital implant in 250 consecutive cases.

The coral-derived hydroxyapatite sphere is a popular, new integrated orbital implant designed to provide improved motility of the ocular prosthesis following enucleation. Although the implant has rapidly become widely used by ophthalmologists, there is little information available regarding the complications of this technique in a large series of cases. We report our results on our initial 250 consecutive cases of hydroxyapatite implantation for eyes enucleated primarily for intraocular neoplasms, with specific emphasis on the complication an their management. The reasons for enucleation included uveal melanoma (157 cases), retinoblastoma (70 cases), blind painful eye (22 cases), and intraocular medulloepithelioma (1 case). Prior treatment to the eye was performed before enucleation in 47 cases and included repair of ruptured globe (17 cases), plaque radiotherapy (18 cases), external beam radiotherapy (6 cases), and others (6 cases). During a mean of 23 months follow-up (range, 6 to 42 months), there have been no recognizable cases of orbital hemorrhage related to the implant and no cases of implant extrusion or implant migration. There was one case of presumed orbital infection (culture-negative) that resolved with intravenous antibiotics, and the implant was retained within the orbit. Other problems included conjunctival thinning in eight cases managed by observation and prosthesis adjustment and conjunctival erosion in four cases managed by combinations of scleral patch graft, conjunctival flap, and prosthesis adjustment. The conjunctival erosion was caused by a poorly fitting prosthesis in three cases and wound dehiscence in one case. The complication rate in eyes receiving prior radiotherapy or surgery was not increased. The hydroxyapatite integrated orbital implant is a well-tolerated motility implant without the high rate of extrusion and infection seen with other motility implants.

Adult↗

A physico-mathematical model for the human femur, with and without a prosthesis, under the static constraints of one-legged stance.

The authors present a physico-mathematical model of a human femur, under "monopodal" static constraints, using the finite elements method. Three examples are considered: a normal femur, a femur implanted with a short-stem prosthesis without cement, and a femur implanted with a long-stem prosthesis without cement. The lines of isoconstraints were compared in the three examples, as well as the main constraints (direction and intensity). From the results, the authors suggest that a prosthesis made of titanium is currently best even though its YOUNG's modulus differs from that of the bone. A prosthesis of composite material is possible in the future. While the intensity of the constraints is nearly the same at the level of the epiphysis for the short-stem and long-stem prosthesis it seems that the short-stem prosthesis fitted accurately without cement is the best solution. The introduction of a hip prosthesis modifies the normal curve of the loaded femur by changing the center of this curve.

Biomechanical Phenomena↗

The quasi-integrated porous polyethylene orbital implant.

PURPOSE: To describe a new quasi-integrated porous polyethylene orbital implant that combines the advantages of host tissue incorporation and improved motility with a single-stage surgery. METHODS: Twenty-four consecutive patients undergoing primary or secondary orbital implantation received the quasi-integrated porous polyethylene implant. Approximately 6 weeks after implantation, a custom-fitted prosthesis was made by an impression technique to provide a "lock-and-key" fit with the orbital implant. Postoperative complications and motility of the prosthetic shell were evaluated. RESULTS: During the 27-month period between December 1998 and March 2001, 24 patients received the quasi-integrated porous polyethylene implant as a buried orbital implant. Thirteen patients received the implant as a primary orbital implant after either evisceration or enucleation and 11 patients received the implant as a secondary orbital implant. Follow-up ranged from 3 months to 30 months, with an average of 16.9 months. All patients were considered to have good motility of their prosthetic shell at their final follow-up visit. No cases of implant extrusion or migration were noted. Two patients required deepening of their inferior fornix to accommodate the increased motility of their prosthesis. CONCLUSIONS: The new quasi-integrated porous polyethylene orbital implant provides improved motility without the need for secondary placement of pegs or screws. It has the advantage of biocompatibility, allowing host tissue incorporation to resist implant migration and extrusion. The implant is available in three sizes: small, medium, and large, approximating the volume of a 16-, 18-, and 20-millimeter sphere, respectively.

Adolescent↗

Outcome of fitting an ICEROSS prosthesis: views of trans-tibial amputees.

A report of the outcome of fitting ICEROSS prostheses to trans-tibial amputees from a subregional amputee rehabilitation centre is presented. This work has mainly concentrated on obtaining patients' own views to judge advantages and disadvantages of ICEROSS compared to their previous patellar-tendon-bearing (PTB) prostheses. Sixty-nine patients were entered for this study, but the results of the study are based on 54 patients who responded. Fifteen patients (27.7%) had rejected their ICEROSS prosthesis at the time of the study. Provision of ICEROSS prostheses did not improve indoor and outdoor walking abilities in terms of distance or use of other walking aids, nor were they more comfortable to wear. An increase in sweating in the first 3 months of wearing ICEROSS was significant, but settled afterwards. The amputees considered that the rate of stump skin breakdown with ICEROSS compared to their PTB prostheses was significantly less. Walking up and down stairs was more comfortable and in general overall rating of ICEROSS prostheses they were scored significantly higher by the amputees themselves. It is concluded that appropriate patient selection is vital and in certain cases ICEROSS will provide considerable benefits to the amputees.

Activities of Daily Living↗

Adaptive prosthetics for the lower extremity.

The potential for lifestyle recovery is tremendous for most lower extremity amputees. The amazing and ever-expanding array of adaptive prosthetics can help make the devastating loss of amputation more bearable for patients, their families, and their health care team. The new amputee, in a state of shock and grief, does not know what his or her prosthetic options are. It is crucial that the surgeon is knowledgeable about what the patient can have and what the patient needs to ask for. Dana Bowman stated: Ideally, the new amputee should say to their doctor, "I'd like my leg to be lightweight, flexible, durable, comfortable. I want to do sports or I want to ride bikes with my kids." Whatever it is they like to do. I was told I would never be able to wear two dynamic feet and that my sky diving days were over. I said, "Well how do you know? Can't I try?" It took years to find out what I could have and then to find people to help me get it. The prosthetic prescription the physician writes is the patient's gateway to the kind of prosthetics that will enable him or her to pursue the activities of their life. Often, new amputees end up with the bare minimum prosthesis, which can cause problems with comfort and mobility. A poorly designed or badly fitting prosthesis is as disabling as the actual amputation. When the surgeon can help the amputee and his or her family understand what kind of prosthetic choices are available, it establishes an optimistic outlook that is highly beneficial to the entire recovery process physically and mentally. "When I lost my leg, if someone would have told me that I could at least try to run again, that would have meant a lot," said Brian Frasure. "Getting that positive mental attitude is every bit as important as having good medical and prosthetic care." By asking probing questions about the patient's preamputation lifestyle and postamputation goals, the physician can write a prescription for truly adaptive prosthetics. The surgeon should consider the economic benefits of asking for a waterproof leg for an older adult that he or she can use for more stability in the shower and that can go a long way toward preventing fracture and other injuries. There are economic considerations for a younger amputee, asking for an energy-storing foot or an adjustable ankle so that he or she can be more active and independent and probably avoid the health risks associated with depression, inactivity, or obesity. If all patients received a contoured, flexible, dynamic socket from the beginning, years of medical problems and treatment for injury to the residual limb could be avoided. The initial prosthetic prescription is probably the best opportunity the patient ever will have to get the adaptive prosthetics that can meet his or her needs best. It also establishes a precedent with the payer for quality prosthetic care and begins educating all payers about what prosthetic patients can and should have. Insurance companies may resist the idea of a second prosthesis or of specialized components that increase the cost of the initial prosthesis. Physicians, patients, and the multidisciplinary team can work together, however, to pursue the most complete prosthetic coverage possible. For the prosthetic user, it is the difference between being restored to a full and active life or sitting back and becoming a spectator.

Adult↗

A new alignment jig for quantification and prescription of three-dimensional alignment for the patellar-tendon-bearing trans-tibial prosthesis.

Clinically, it is hard to achieve and reproduce prosthesis alignment at will during daily prosthesis fitting. A new alignment jig was designed and developed to facilitate quantification and prescription of prosthesis alignment for patellar-tendon-bearing (PTB) trans-tibial prostheses. The alignment jig provided instantaneous readings of the three-dimensional orientation and position of the socket relative to the prosthetic foot in standardised units. The inter- and intra-tester errors of the alignment jig in measuring prosthesis alignment were evaluated and demonstrated to have good reliability. The alignment jig was recommended to be used clinically after the conventional dynamic alignment procedure to document the prosthesis alignment. Further application of the alignment jig for systematic evaluation of the effects of prosthesis alignment on gait for trans-tibial amputees is suggested.

Artificial Limbs↗