MyMedR

Simple method for retrieval of distal segment of the broken interlocking intramedullary nail

Marwan M, Ibrahim M

Injury, 1999 Jun;30(5):333-5.

A simple technique for removal of the distal fragment of the broken intramedullary interlocking nail is described. It was successfully used in three patients with a broken nail due to nonunion. The technique requires only cerclage wire, which is available in any operating room, avoiding the difficulties obtaining the custom made hook and of excessive exposure to radiation.

Matched MeSH terms: Prosthesis Failure*

A simple method for removal of a broken intramedullary nail

Sivananthan KS, Raveendran K, Kumar T, Sivananthan S

Injury, 2000 Jul;31(6):433-4.

PMID: 10831741

The removal of broken implanted intramedullary nails secondary to re-fracture or non-union is challenging. In 12 cases a simple and safe method has been used to remove broken implants.

Matched MeSH terms: Prosthesis Failure

Hepaticogastric fistulation from a proximally migrated biliary stent

Mahadeva S, Ranjeev P, Goh KL

Gastrointest Endosc, 2003 Aug;58(2):295-7.

PMID: 12872109

Matched MeSH terms: Prosthesis Failure

Revision of total hip arthroplasty using an anterior cortical window, extensive strut allografts, and an impaction graft: follow-up study

Arif M, Sivananthan S, Choon DS

J Orthop Surg (Hong Kong), 2004 Jun;12(1):25-30.

PMID: 15237118

To report the outcome of revised total hip arthroplasty procedures involving an anterior cortical window, extensive strut allografts, and an Exeter impaction graft.

Matched MeSH terms: Prosthesis Failure*

Five- to 12-year follow-up of a hydroxyapatite-coated, cementless total knee replacement in young, active patients

Tai CC, Cross MJ

J Bone Joint Surg Br, 2006 Sep;88(9):1158-63.

PMID: 16943464

We carried out a prospective study of 118 hydroxyapatite-coated, cementless total knee replacements in patients who were = 55 years of age and who had primary (92; 78%) or post-traumatic (26; 22%) osteoarthritis. The mean period of follow-up was 7.9 years (5 to 12.5). The Knee Society clinical scores improved from a pre-operative mean of 98 (0 to 137) to a mean of 185 (135 to 200) at five years, and 173 (137 to 200) at ten years. There were two revisions of the tibial component because of aseptic loosening, and one case of polyethylene wear requiring further surgery. There was no osteolysis or progressive radiological loosening of any other component. At 12 years, the overall rate of implant survival was 97.5% (excluding exchange of spacer) and 92.1% (including exchange of spacer). Cementless total knee replacement can achieve excellent long-term results in young, active patients with osteoarthritis. In contrast to total hip replacement, polyethylene wear, osteolysis and loosening of the prosthesis were not major problems for these patients, although it is possible that this observation could change with longer periods of follow-up.

Matched MeSH terms: Prosthesis Failure

Early clinical and radiographic analysis of the Fitmore cup

Merican AM, Randle R

J Arthroplasty, 2006 Sep;21(6):846-51.

PMID: 16950037

The Fitmore titanium mesh cementless acetabular component in 115 hip arthroplasties was reviewed at an average of 33 months of follow-up. None were revised nor had infection. One hip dislocated 4 years postoperatively. Two femoral components were revised. The average Harris Hip Score at the last follow-up was 90 points. In the 96 sets of radiographs available, there was no loosening or new radiolucency. One hip had nonprogressive osteolysis adjacent to a screw. This press-fit cup has its polar region flattened and is rim loading. Noncontact (gaps) at the acetabular floor is expected and is not critical for fixation. In all but 6 hips, these gaps filled. In 5 hips, a minimal gap (

Matched MeSH terms: Prosthesis Failure

Midterm outcome of the Duracon total knee arthroplasty

Yong CK, Choon DS, Soon HC

J Orthop Surg (Hong Kong), 2008 Aug;16(2):197-200.

PMID: 18725672

To present midterm results of Duracon total knee arthroplasty (TKA) performed between 1991 and 2001.

Matched MeSH terms: Prosthesis Failure

Prevention of aspiration following recurrent dislodgement of voice prosthesis: a patient's innovation

Masaany M, Marina MB, Asma A, Sani A

J Laryngol Otol, 2009 Jun;123(6):680-2.

PMID: 18544175 DOI: 10.1017/S0022215108002958

To demonstrate a simple, practical, cheap method of preventing potentially fatal aspiration of a dislodged voice prosthesis; this method was developed by a laryngectomised patient.

Matched MeSH terms: Prosthesis Failure

Opacification of AcriFlex 50CSE hydrophilic acrylic intraocular lenses

Lim AK, Goh PP, Azura R, Mariam I

J Cataract Refract Surg, 2011 Apr;37(4):655-9.

PMID: 21420589 DOI: 10.1016/j.jcrs.2010.10.050

PURPOSE: To determine the prevalence of and risk factors for AcriFlex 50CSE hydrophilic acrylic intraocular lens (IOL) opacification approximately 3 years after implantation.
SETTING: Selayang Hospital, Selangor, Malaysia.
DESIGN: Cross-sectional study.
METHODS: Patients who had AcriFlex 50CSE IOL implantation in 2005 and 2006 were identified from operating logbooks and recalled via telephone and letters. Opaque IOLs were explanted and sent for scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS).
RESULTS: The review showed that 18 patients had died and 67 had declined examination or could not be contacted, leaving 239 eyes for evaluation. The age of the patients ranged from 25 to 85 years. Of the patients, 83 (34.7%) were Malay, 127 (53.1%) Chinese, and 29 (12.1%) East Indian. The male:female ratio was 1:1. Fourteen eyes of 13 patients (5.4%) had IOL opacification; 1 had bilateral opacification. Five eyes had fine deposits, and 9 eyes had dense opaque deposits. Seven opaque IOLs required explantation. There was no correlation between age (P=.645), sex (P=.319), or race (P=.860) and IOL opacification. Pearson chi-square analysis showed a strong association between diabetes mellitus and IOL opacification (P=.019). Nine (69.2%) of the 13 patients with opacification had diabetes. Scanning electron microscopy and EDS showed calcium and phosphate deposits on the optic surface and intralenticularly near the anterior surface of the optic.
CONCLUSIONS: Results indicate that diabetes mellitus is a risk factor for AcriFlex hydrophilic acrylic IOL opacification. In some cases, opacification affected vision, necessitating explantation. The pathophysiology of this complication is unknown.
FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.

Matched MeSH terms: Prosthesis Failure*

Fulltext Spontaneous dislocation of intraocular lens as a late complication of uncomplicated cataract surgery: a case series

Lam HH, Visvaraja S

Clin Exp Optom, 2012 Jan;95(1):99-102.

PMID: 21954950 DOI: 10.1111/j.1444-0938.2011.00640.x

Five patients having uncomplicated phacoemulsification were implanted with CT-Asphina 603P intraocular lenses into the capsular bag. After a few months, three of the patients had haptic flexion anterior to the optic despite minimal capsular fibrosis. One patient had spontaneous dislocation of the intraocular lens into the anterior chamber with only minimal capsular fibrosis. Another patient had one haptic dislocated out of the bag. Late intraocular lens dislocation is also seen in newly designed preloaded intraocular lenses despite the absence of significant capsular fibrosis. Haptic-optic junction design and intraocular lens material play important roles in such complication. A slightly large capsulorhexis might be a deterrent for implantation of this intraocular lens.

Matched MeSH terms: Prosthesis Failure

Leaflet extension in rheumatic mitral valve reconstruction

Dillon J, Yakub MA, Nordin MN, Pau KK, Krishna Moorthy PS

Eur J Cardiothorac Surg, 2013 Oct;44(4):682-9.

PMID: 23407161 DOI: 10.1093/ejcts/ezt035

Type IIIa mitral regurgitation (MR) due to rheumatic leaflet restriction often renders valve repair challenging and may predict a less successful repair. However, the utilization of leaflet mobilization and extension with the pericardium to increase the surface of coaptation may achieve satisfactory results. We reviewed our experience with leaflet extension in rheumatic mitral repair with emphasis on the technique and mid-term results.

Matched MeSH terms: Prosthesis Failure

Is rheumatic aetiology a predictor of poor outcome in the current era of mitral valve repair? Contemporary long-term results of mitral valve repair in rheumatic heart disease

Yakub MA, Dillon J, Krishna Moorthy PS, Pau KK, Nordin MN

Eur J Cardiothorac Surg, 2013 Oct;44(4):673-81.

PMID: 23447474 DOI: 10.1093/ejcts/ezt093

Contemporary experience with mitral valve (MV) repair in the rheumatic population is limited. We aimed to examine the long-term outcomes of rheumatic MV repair, to identify the predictors of durability and to compare the repair for rheumatic and degenerative MVs.

Matched MeSH terms: Prosthesis Failure

Stress analysis of femoral bone resorption with implant

Solehuddin Shuib, Sahari, B.B., Wong, Shaw Voon, Arumugam, Manohar, Halim Kadarman, A.

CREAM : Current Research in Malaysia (Penyelidikan Terkini di Malaysia), 2013;2(2):23-41.

MyJurnal

Bone is a living tissue. It continuously reproduces its structure and its growth depends partly upon the applied mechanical load. After an implant is inserted, the load equilibrium is disturbed, leading to bone resorption and the stress shielding phenomena. Aseptic loosening is the main contributor for hip prosthesis failure. The purpose of the study is to determine the effect of bone resorption on the stress values and hence obtain a better understanding of the behavior of the stress adaptive bone-remodeling. The bone material used for the analysis was assumed to be isotropic and linearly elastic, and the external loads applied comprised of a femoral head load and an abductor load. A Finite element computer program for evaluating the changes in bone's density and modulus was developed. The values of stress for bone, cement mantle in medial, and lateral positions of Total Hip Replacement (THR) are presented. The failure mechanisms of THR with bone resorption observed the implant loosening since stress is reduced.

Matched MeSH terms: Prosthesis Failure

Fulltext In defence of Girdlestone excision arthroplasty: a comment on 'Unusual way of loosened total hip arthroplasty treatment with an Austin Moore endoprosthesis'

Sinha NK, Bhardwaj A, Poduval M, Rao BS

J Postgrad Med, 2014 Apr-Jun;60(2):222-3.

PMID: 24823541 DOI: 10.4103/0022-3859.132388

Matched MeSH terms: Prosthesis Failure*

Fulltext Design process of cementless femoral stem using a nonlinear three dimensional finite element analysis

Baharuddin MY, Salleh ShH, Zulkifly AH, Lee MH, Noor AM, A Harris AR, et al.

BMC Musculoskelet Disord, 2014;15:30.

PMID: 24484753 DOI: 10.1186/1471-2474-15-30

Minimal available information concerning hip morphology is the motivation for several researchers to study the difference between Asian and Western populations. Current use of a universal hip stem of variable size is not the best option for all femur types. This present study proposed a new design process of the cementless femoral stem using a three dimensional model which provided more information and accurate analysis compared to conventional methods.

Matched MeSH terms: Prosthesis Failure

Anatomy and Physiology of Left Ventricular Suction Induced by Rotary Blood Pumps

Salamonsen RF, Lim E, Moloney J, Lovell NH, Rosenfeldt FL

Artif Organs, 2015 Aug;39(8):681-90.

PMID: 26146861 DOI: 10.1111/aor.12550

This study in five large greyhound dogs implanted with a VentrAssist left ventricular assist device focused on identification of the precise site and physiological changes induced by or underlying the complication of left ventricular suction. Pressure sensors were placed in left and right atria, proximal and distal left ventricle, and proximal aorta while dual perivascular and tubing ultrasonic flow meters measured blood flow in the aortic root and pump outlet cannula. When suction occurred, end-systolic pressure gradients between proximal and distal regions of the left ventricle on the order of 40-160 mm Hg indicated an occlusive process of variable intensity in the distal ventricle. A variable negative flow difference between end systole and end diastole (0.5-3.4 L/min) was observed. This was presumably mediated by variable apposition of the free and septal walls of the ventricle at the pump inlet cannula orifice which lasted approximately 100 ms. This apposition, by inducing an end-systolic flow deficit, terminated the suction process by relieving the imbalance between pump requirement and delivery from the right ventricle. Immediately preceding this event, however, unnaturally low end-systolic pressures occurred in the left atrium and proximal left ventricle which in four dogs lasted for 80-120 ms. In one dog, however, this collapse progressed to a new level and remained at approximately -5 mm Hg across four heart beats at which point suction was relieved by manual reduction in pump speed. Because these pressures were associated with a pulmonary capillary wedge pressure of -5 mm Hg as well, they indicate total collapse of the entire pulmonary venous system, left atrium, and left ventricle which persisted until pump flow requirement was relieved by reducing pump speed. We suggest that this collapse caused the whole vascular region from pulmonary capillaries to distal left ventricle to behave as a Starling resistance which further reduced right ventricular output thus contributing to a major reduction in pump flow. We contend that similar complications of manual speed control also occur in the human subject and remain a major unsolved problem in the clinical management of patients implanted with rotary blood pumps.

Matched MeSH terms: Prosthesis Failure*

Dislodgement of the MGuard Prime MicroNet™ During Primary PCI

Ismail MD, Han CK, Loch A

Cardiovasc Intervent Radiol, 2016 May;39(5):785-787.

PMID: 26757911 DOI: 10.1007/s00270-015-1290-1

Matched MeSH terms: Prosthesis Failure

Revision Total Hip Arthroplasty Using an Acetabular Reinforcement Ring With a Hook: A Precise Follow-Up, at Average 11.4 Years, of a Previous Report

Park KS, Seon JK, Lee KB, Kim SK, Chan CK, Yoon TR

J Arthroplasty, 2017 02;32(2):503-509.

PMID: 27546473 DOI: 10.1016/j.arth.2016.07.010

BACKGROUND: This study aims at determining the average long-term result of revision total hip arthroplasty (THA) using the acetabular reinforcement ring with a hook (ARRH) and bone grafting in severe acetabular bony defect. Expected 15-year survival of ARRH in revision THA is included in the study.

METHODS: Retrospective review of 48 patients (48 hips) with follow-up duration of average 11.4 years (range, 6.1-21.4 years) was conducted. At each follow-up, Harris hip score was used to assess functional outcome, and radiographic acetabular component osteolysis was measured by DeLee and Charnley classification. Bone defects were assessed preoperatively and intraoperatively using American academy of orthopedic surgeons and Paprosky classification. The common modes of ARRH failures were evaluated. Bone consolidation, presence of heterotopic ossification, and complications such as infection and dislocation were recorded.

RESULTS: The bone defects were varied and included cavitary, segmental, and combined defects without any pelvic discontinuity. Mean Harris hip score improved from 52.6 points preoperatively to 82.0 points postoperatively. Nine acetabular revisions and 3 stem revisions (2 concurrent with acetabular revisions and 1 isolated stem revision) were performed. There were 5 infected cases and 1 patient with recurrent dislocation. The 11.4-year survival of revision THA with ARRH was 71% as the end point for acetabular revision surgery for any reason. The expected 15-year survival of revision THA with ARRH was 60%. The most common failure mode of ARRH was superomedial migration followed by lateral migration.

CONCLUSION: ARRH combined with bone grafting produces relatively good average long-term clinical results.

Matched MeSH terms: Prosthesis Failure

Fulltext Antegrade repositioning of Memokath stent in malignant ureteroileal anastomotic stricture

Ng KL, Nawawi O, Lim BK, Htun TH, Dublin N, Razack AH

Asian J Surg, 2017 Apr;40(2):171-174.

PMID: 24210538 DOI: 10.1016/j.asjsur.2013.09.012

Ureteric strictures are common and can be due to benign or malignant causes. Various surgical treatments can be used from minimally invasive endoscopic retrograde JJ stent insertion, balloon dilatation, ureterolithotomy, to open surgical exploration and repair. Memokath 051 stent is a metallic stent designed for long-term ureteral stenting in the management of ureteral strictures. The insertion of this device is usually a straightforward procedure performed endoscopically in a retrograde fashion via cystoscopy. However, this procedure can be difficult in complicated scenarios when the bladder has been removed with neoureteral reimplantations or high-grade strictures. Here, we report a case of Memokath stent insertion complicated by placement difficulties in a lady with ileal conduit due to previous ovarian cancer complicated by vesicovaginal fistula, who presented with malignant stricture of the ureteroileal anastomosis. We describe a simple yet effective antegrade technique to precisely reposition the malpositioned Memokath stent, along with illustrations.

Matched MeSH terms: Prosthesis Failure*

Fulltext Long-term performance of a transcatheter pacing system: 12-Month results from the Micra Transcatheter Pacing Study

Duray GZ, Ritter P, El-Chami M, Narasimhan C, Omar R, Tolosana JM, et al.

Heart Rhythm, 2017 05;14(5):702-709.

PMID: 28192207 DOI: 10.1016/j.hrthm.2017.01.035

BACKGROUND: Early performance of the Micra transcatheter pacemaker from the global clinical trial reported a 99.2% implant success rate, low and stable pacing capture thresholds, and a low (4.0%) rate of major complications up to 6 months.

OBJECTIVE: The purpose of this report was to describe the prespecified long-term safety objective of Micra at 12 months and electrical performance through 24 months.

METHODS: The Micra Transcatheter Pacing Study was a prospective single-arm study designed to assess the safety and efficacy of the Micra VVIR leadless/intracardiac pacemaker. Enrolled patients met class I or II guideline recommendations for de novo ventricular pacing. The long-term safety objective was freedom from a system- or procedure-related major complication at 12 months. A predefined historical control group of 2667 patients with transvenous pacemakers was used to compare major complication rates.

RESULTS: The long-term safety objective was achieved with a freedom from major complication rate of 96.0% at 12 months (95% confidence interval 94.2%-97.2%; P < .0001 vs performance goal). The risk of major complications for patients with Micra (N = 726) was 48% lower than that for patients with transvenous systems through 12 months postimplant (hazard ratio 0.52; 95% confidence interval 0.35-0.77; P = .001). Across subgroups of age, sex, and comorbidities, Micra reduced the risk of major complications compared to transvenous systems. Electrical performance was excellent through 24 months, with a projected battery longevity of 12.1 years.

CONCLUSION: Long-term performance of the Micra transcatheter pacemaker remains consistent with previously reported data. Few patients experienced major complications through 12 months of follow-up, and all patient subgroups benefited as compared to transvenous pacemaker historical control group.

Matched MeSH terms: Prosthesis Failure

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