Press fit femoral stem

Andrew Manktelow – Total hip replacementOrthovasiveIncidence of Heterotopic Ossification Following Total Hip

Press-fit stems achieve immediate fixation to allow ingrowth. We discuss principles of press-fit and then review the different stem designs that allow for this technique. The technique to prepare the femoral canal for the stem implant utilizes broaching alone for the metaphyseal fitting stems, and utilizes reaming for the meta-diaphysial. Average femoral geometry was determined from sections of 25 human femurs. A 'stem design program' was used to determine the largest femoral stem that could be introduced into the canal. The stem was fine tuned by observations of fit in Plexiglass models of the 25 femurs. This stem was called the 'Ex Radiology of Press Fit Femoral Stems. - See: - Post Op X-rays for THR: - Press Femoral Stems: - Normal Adaptive Changes: - proximally coated femoral stems should show fusiform cortical hypertrophy along the coated portions of the stem and absence of radiolucent lines; - distally radiolucent lines will surround the uncoated portion of the stem Press Fit Femoral Stems - See: Total Hip Replacement Menu: - Insertion of Cementless Femoral Stem: - Radiology of Press Fit Stems: - Removal of Cementless Stems: - Discussion: - indications: - younger patients (less than 65 years of age w good bone stock, and absence of hemophilia, sickle cell, or renal diseases;. With a canal-filling press-fit femoral component there is wide variation of postoperative component anteversion with most stems placed in increased anteversion compared with the anatomic head. The surgical technique may need to adjust for this if causing intraoperative impingement or instability

- press fit femoral stem main discussion - coating press fit femoral stem; - to maintain bone stock, proximal stress transfer must be a prominent feature of any cementless implant system; - proximal part of femur is often exposed to high longitudinal strain, & bone in this region is equipped for high lonitudinal deflection Sendtner et al. using intraoperative computer navigation noted femoral stem anteversion of an average of 18° with a range from −13°, retroversion, to 38°, anteversion, with a press-fit stem. Some variation of values may be attributable to the measurement method, but it is clear there is a wide range of postoperative values in all of these.

STEM: Press-Fit — Hip & Knee Boo

Strains and micromotions of press-fit femoral stem

1. Orthop Traumatol Surg Res. 2017 Jun;103(4):579-581. doi: 10.1016/j.otsr.2017.01.015. Epub 2017 Mar 21. Global fit concept in revision hip arthroplasty for cementless press-fit femoral stems The press-fit concept can be applied: In metaphyseal zone (between the tip of the greater trochanter and the base of the lesser trochanter) a press-fit effect can be envisaged on the sagittal plane only if the bone stock is preserved and with an ad hoc implant. In the metaphyseo-diaphyseal zone which is a naturally tapered space. In many cases.

Radiology of Press Fit Femoral Stems : Wheeless' Textbook

Press Fit Femoral Stems : Wheeless' Textbook of Orthopaedic

Press-Fit Femoral Stem AcuMatch'm Cobalt-Chromium (Co28Cr6Mo) Tapered stem with two neck 12/14 C-Series ASTM F799 offsets (Sizes 1-6) Cemented Femoral Stem AcuMatch 'm Cobalt-Chromium (Co28Cr6Mo) Tapered stem with one neck 12/14 L-Series ASTM F799 offset (Sizes 1-5). The stem options for the GMRS Proximal Femoral Replacement are unrivaled and are now available in both cemented and press-fit stem options. The cemented stems are available in six configurations: straight, curved and long curved, each type with or without extra-cortical porous-coated body sections. The press-fit stems are available i

Complex Femoral Reconstruction in Revision Total Knee

The cementless line of SYNERGY stems is manufactured from a titanium alloy, Ti 6Al-4V. 1. Porous The sintered-bead ROUGHCOAT™ Porous Coating is manufactured from commercially pure titanium. 2. HA SYNERGY HA is a press-fit stem with the proximal one-third sprayed with 50 microns of almost 100% pure HA over a grit-blasted surface. 3. Porous Plus H Technique. methods. press fit technique. slightly larger implant than what was reamed/broached is wedged into position. line-to-line technique. size of implant is the same as what was reamed/broached. screws often placed in acetabulum if reamed line-to-line. biologic fixation is optimized with. pore size 50-300um

Increased anteversion of press-fit femoral stems compared

The Various Stress Patterns of Press-Fit, Ingrown, and Cemented Femoral Stems R. HUISKES, PH.D. Finite-element analysis was used to study the gen­ eral differences in load-transfer mechanisms and stress patterns of cemented, fully ingrown, proxi­ mally ingrown, and smooth press-fitted femoral stems in total hip arthroplasty (THA). Identica Omnifit® press-fit stem size, thus approximating the final stem seating level . Proper seating of the broach allows for a further evaluation of the neck resection level (Fig. 13B). Note: Secur-Fit Max Stems are 1 .25mm larger than the broach (Silver) outer dimensions . For these stems, it ma surgery when the femoral stem is not being replaced or for use with any other than a polyethylene or metal-backed polyethylene cup. In the USA, ceramic heads are not approved for use with metal cups. WARNINGS AND PRECAUTIONS Ceramic coated femoral stem prostheses are indicated for uncemented press fit fixation The ACCOLADE II Femoral Hip System is a femoral stem that is intended for cementless, press-fit application. The proximal region of the stem is coated with PureFix HA over a commercially pure titanium plasma spray substrate. The Morphometric Wedge — an evolution of th

Press Fit Femoral Stem: Proximal Fixation : Wheeless

The introduction of press-fit stems apparently reduced the amount of bending in the bone because of the stiffening effect of the stem. Such an effect would occur for metallic press-fit stems, which substantially filled the canal. (In our experi- ments, the reduced offset of the metallic femoral Fig. 3. Bone 7 Average femoral geometry was determined from sections of 25 human femurs. A 'stem design program' was used to determine the largest femoral stem that could be introduced into the canal. The stem was fine tuned by observations of fit in Plexiglass models of the 25 femurs. This stem was called the 'Exact-Fit'. Type 1 stem was formed by grinding the anterior and posterior faces flat Request PDF | Cementless revision femoral stems application of press-fit principles and clinical outcomes | Background Cementless femoral stems are currently used in revision total hip. A full-line, modular femoral stem inspired by the clinical success of Wagner style predecessors. The system's intuitive design and premium quality is based on extensive research13 and development that redefines revision Revelation® microMAX™ Stem press fit rest fit The uncemented femoral stem is press fit, double tapered design with a hydroxyapatite (HA) coating and is intended to be implanted in prepared femur medullary canal without bone cement (press fit cementless fixation). HA coating is plasma sprayed coating conforming to ISO 13779-2:2008: Implants for surgery — Hydroxyapatite — Part 2.

Extensively Porous-Coated Cylindrical Uncemented Femoral

The 'exact-fit' stem gave less resultant micromotion than the type 1 and type 2 stems. The high variation of the strain results was attributed to variations in stem-bone contact and fit. The study provided information of direct application to press-fit stems in hip replacement surgery Ninety-three dogs with 101 THR including dogs undergoing THR with a BFX lateral bolt femoral stem (n = 40), BFX collared stem (n = 21), and traditional BFX stem (n = 40). Methods. Radiographs of traditional BFX (n = 40), collared BFX (n = 21), and BFX lateral bolt (n = 40) THR performed from 2015 to 2018 were reviewed Two 18-mm generic femoral hip implants were modeled using the same geometry, differing only in that one had a cylindrical stem and the other had a 2 degree tapered stem. Surgery was simulated using a .05-mm and .01-mm press-fit and tested with a physiologically relevant loading protocol

Increased Anteversion of Press-fit Femoral Stems Compared

  1. stems with clinically successful long -term follow -up (3, 6). Among uncemented stems, the M/L taper stem had a lower rate of subsidence than most other RSA -studied, press -fit femoral stems (1,4,5). Similar to previous reports, we observed the greatest stem subsidence to occur within the first 6 postoperative months (5). After peaking a
  2. In order to achieve predictable prosthesis fixation, it is best Figure 1. The Link MP hip revision arthroplasty showing options for to implant the stem with a tight press-fit at the femoral isth- different stem lengths, proximal bodies, and spacers to further adjust mus. Poorly fitting stems are less likely to become fixed by leg length
  3. Inserting a press-fit stem can sometimes be problematic. Issues typically occur on the tibial side due to anatomic discrepancy secondary to bone loss, abnormal proximal tibial flexion, or tibia vara. In these cases, correct component position and tibial rotation can be difficult to achieve
  4. The femoral stem subsidence was evaluated using Ein Bild Roentgen Analyse (EBRA). Results: Average stem migration was 0.96 +/- 0.76 mm at 3 months, 1.71 +/- 1.26 mm at 24 months, and 2.04+/- 1.
  5. - 6 femoral stem sizes - Tapered geometry - Cobra flanged - 132 degree neck angle - Size Options: 9mm, 10.5mm, 12mm, 13.5mm, 15mm, 16.5mm ; Foundation Total Hip System: Press-Fit Options - Innovative Wedge Geometry Three degree tapered geometry provides continuous compression to cement mantle, thus allowing the load to be distributed to the bone
  6. However, since the advent of press-fit femoral stems for hip arthroplasty, we have seen a number of patients who have sustained iatrogenic fractures of the proximal and medial aspect of the femur.

The existing stem, cement and granuloma were removed from the femur. The femur was prepared with cylindrical and then conical reamers distal to the flap to prepare the distal press-fit, as in the standard method (Global Fit.mov movie).A trial implant was inserted to check the quality of the distal press-fit (absence of subsidence and length of fit) and the implant length (leg length) The Journal of Orthopaedic Research, a publication of the Orthopaedic Research Society (ORS), is the forum for the rapid publication of high quality reports of new information on the full spectrum of orthopaedic research, including life sciences, engineering, translational, and clinical studies Using press-fit femoral stems for hip arthroplasty has resulted in iatrogenic fractures of the proximal and medial aspect of the femur due to the reaming and broaching procedures. Also seen are.

Total Hip Arthroplasty Echo® Hip System Zimmer Biome

  1. The TRI-LOCK BPS Dual Offset options provide surgeons the ability to lateralize by 6mm-8mm to help manage soft tissue laxity. The offset range is 30mm-50mm depending on stem size. This direct lateralization can enable femoral offset restoration without affecting leg length. Bone Preserving. The reduced lateral shoulder, thin geometry and.
  2. • Cemented Femoral Stems • Press-Fit Femoral Stems • Unipolar Endoprosthesis Heads • Bipolar Endoprosthesis Heads The l-Series cemented and press-fit stems are implanted using the same core set of instruments. The integrated broach system is designed to accurately prepare the femoral canal for optimal stem stability
  3. e the radiographic and functional performance of the RECLAIM modular hip revision system, with particular focus.
  4. Femoral Stem Selection Select the template that fits the proximal femur and equalizes the leg lengths. The femoral template should be in-line with the long axis of femur. Mark the neck resection line at the point where the selected stem provides the desired amount of leg length. Verify the chosen stem size also fits into the lateral plan
CORAIL® Primary Cementless Upgrade Kit | CORAIL PINNACLE

Finite-element analysis was used to study the general differences in load-transfer mechanisms and stress patterns of cemented, fully ingrown, proximally ingrown, and smooth press-fitted femoral stems in total hip arthroplasty (THA). Identical stems were used for the noncemented configurations and a similar stem shape for the cemented configurations tumours of the distal femur. Most femoral stems, however, are straight and therefore poorly fit the anteriorly bowed curvature of the femur. To address this issue, we used a short, curved, uncemented press-fit femoral stem and evaluated its short-term outcomes after reconstruction of the distal femur CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Finite-element analysis was used to study the gen-eral differences in load-transfer mechanisms and stress patterns of cemented, fully ingrown, proxi-mally ingrown, and smooth press-fitted femoral stems in total hip arthroplasty (THA). Identical stems were used for the noncemented configura-tions and a similar stem. This study evaluates the outcomes of 92 hip arthroplasties using a press fit, tapered, split tip, proximally porous ingrowth (CSTi) femoral stem (Zimmer Natural Hip) in consecutive hip arthroplasty patients followed for an average of ten years postoperatively (range 5-16 years). Patients were functionally and radiographically evaluated using Harris Hip Scores and plain radiographs assessing. The femoral component includes a stem, which tapers inwards and bends medially towards its proximal end to match the shape of the medullary cavity of a femur for a press fit connection. Screw holes extend through the stem in the coronal (medial-lateral) and/or sagittal (anterior-posterior) planes to accept screws, which optionally assist in.

Adaptive Bone Remodeling and Biomechanical Design


Broaching for Press Fit Stems : Wheeless' Textbook of

The Provident™ Femoral Hip Stem incorporates a traditional press fit tapered-wedge design with titanium plasma coating proximally for stable fixation. The instruments are well suited for various surgical approaches with minimal trays for simplicity in the operating room To date, the design of press-fit femoral stem prostheses has focused on providing a tight fit within the metaphyseal portion of the femur to eliminate the potential for relative motion. Prior art femoral stem prostheses generally have a circular or rectangular cross-sectional shape and end abruptly in a blunt tip distally

The Woodpecker | Integrated Medical Technologies USA, LLCtotal hip arthroplasty

The various stress patterns of press-fit, ingrown, and

Few biomechanical studies exist on femoral cementless press-fit stems for revision total knee replacement (TKR) surgeries. The aim of this study was to compare the mechanical quality of the femur-stem interface for a series of commercially available press-fit stems, because this interface may be a 'weak link' which could fail earlier than the femur-TKR bond itself Provident™ Femoral Hip Stem. The Provident™ Femoral Hip Stem incorporates a traditional press fit tapered-wedge design with titanium plasma coating proximally for stable fixation. Read More Technical Use & System Scope. The Centerline Stem is designed to achieve press-fit stabilization with a femoral preparation and stem insertion technique similar to as is practiced for a standard BFX EBM Stem, though with a higher, adjusted neck resection and preparation of the lateral exposure.. In addition to the Universal Hip Basic Preparation instrument set, a set of supplemental. - Femoral stem for Total hip arthroplasty and hemiarthroplasty - Version Titanium Press-fit stem with Porous Ti+HA coating in metaphysis and HA only in diaphysis, - Version Stainless Steel to be Cemented, mirror-polished finish - 10 sizes (from 130 to 190mm lengths) - 135° CCD angle for coated stems with or without collar, and cemente For a cementless femoral stem to obtain biological fixation, early micromotion between the bone and stem must be low. If micromotion does occur, the stem will fail collar on a press-fit device, it will be important to follow the clinical outcomes of cementless collared stems. Conclusio

Novation Tapered and Splined Stems Total Hip

When reconstructing the femur of a patient with these normal age changes, a large size press-fit stem often is required, which can make optimizing hip mechanics impossible at times. Because the stem is larger, that part of the stem which is impacted down the femur to achieve bone ingrowth is larger and longer The main reason is the insufficient press-fit between the prosthesis and the femoral medullary cavity during the operation, and subsidence can occur when the weight is loaded after the operation. In this study, femoral prosthesis with cylindrical stem and femoral prosthesis with tapered stem also had different degrees of subsidence after operation

Uncemented, curved, short endoprosthesis stem for distal

A press-fit femoral prosthesis relies on bone ingrowth for long-term stability -bone from the patient grows around small beads on the surface of the femoral prosthesis. A cemented femoral prosthesis is stabilized by injecting bone cement into the hollowed out femoral canal and them placing the femoral component into the putty-like. The canal was undersized by 0.5 mm to create a press-fit of the femoral component into the canal. The exact size of each femoral canal, straight reamer and femoral stem were confirmed with digital calipers for each specimen. The femoral component was inserted with manual impaction to the desired diaphyseal depth The ICONACY I-Hip system consists of femoral stem and acetabular cup (i.e., shell) porous coated components intended for cementless, press-fit fixation. Refer to the Package Insert for the list of contraindications Alteon Monobloc Revision Femoral Stem is a press-fit, distally fixed, one-piece tapered, splined titanium stem

Cortical bone viscoelasticity and fixation strength of

On June 8, 2015, Zimmer Inc. initiated a Class I Recall of its M/L Taper with Kinectiv Technology Femoral Stems and Necks. Manufacturing Residue. Due to a process monitoring failure, higher-than-expected amounts of manufacturing residues were left on the devices made fromMarch 31, 2015 through April 20, 2015 These suggested that the existence of CF-LFN might be associated with the press-fit mechanism of the metaphyseal-filling stem. Previous studies assessed the association between several anatomic parameters at different femoral levels and the postoperative stem anteversion after THA in OA patients [9, 13, 14] Experimental protocol. Torsional testing of the press fit femoral stem in the distal femoral specimen was carried out on a multi-axis biomechanical test frame, in conjunction with a Vicon 3-D motion analysis 4-camera system (Model MX13; Vicon Motion Systems; Lake Forest, CA) for the tracking of relative motion between implant and femur ().Axial (torsional) moments were applied to the specimens. Maxx Orthopedics, Inc., based in Norristown, Pennsylvania, has announced the commercial launch and first successful surgeries of its new Libertas Taper Reduced Uncemented Femoral Stem, a press fit, double tapered stem with Ti-GrowthC coating which promotes biological integration with the bone

The implant-bone fit is critical to the longevity of press-fit total hips. Maximum contact on the internal cortical bone surface, especially proximally, produces more normal strain values and reduces micromotion and sinkage. Stem design computer software was developed to design both individualized hip stems that maximize implant-bone contact for a unique anatomy, and average anatomic hip stems. press-fit with many of the currently available cylindrical shaped stems - especially in the patulous distal femur. If a tight press-fit is obtained, then end of stem pain can also be a significant factor - most commonly seen on the tibial side of the construct.10,11 To avoid these difficulties and complications, some surgeons hav A press-fit, distally fixed, one-piece tapered, splined titanium stem. Alteon ® Monobloc Revision Femoral Stem It incorporates specific philosophies designed to improve surgical experiences and clinical outcomes The press-fit and outcomes of THA performed using a press-fit femoral this stem were have been reported to be good for the primary osteoarthritis in selected Caucasian patients; . hHowever, there were a few reports are available on the outcomes of THA using this stem this procedure in Japanese patients. Since The majority of the mos