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Surgical Technique
カタログの1ページ目を開くINDICATIONS The indications for use of the total hip replacement prostheses include: • Noninflammatory degenerative joint disease, including osteoarthritis and avascular necrosis; • Rheumatoid arthritis; • Correction of functional deformity; • Revision procedures where other treatments or devices have failed; and, • Nonunions, femoral neck fractures, and trochanteric fractures of the proximal femur with head involvement that are unmanageable using other techniques. Additional indication specific to use of ACCOLADE II Femoral Stems with compatible Howmedica Osteonics Constrained Liners: •...
カタログの2ページ目を開くACCOLADE II Femoral Hip System 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 the tapered wedge — is characterized by its variable, size-specific medial curvature. The ACCOLADE II Femoral Hip System is suitable for various surgical approaches, including direct anterior. The total system includes: • 12 body sizes ranging from size 0 to size 11 • Two anatomic offset options for...
カタログの3ページ目を開くPRE-OPERATIVE PLANNING Pre-operative planning aids in the determination of probable implant style and size. The preoperative planning process should take qualitative and quantitative factors (including patient bone quality, density, and morphology) into consideration in order to evaluate and select the appropriate instrument/implant system for the patient. The ACCOLADE II has two offset options: the standard offset 132° neck angle and the high offset 127° neck angle. Choose the ACCOLADE II template for which the stem size achieves medio-lateral cortical engagement at the proximal twothirds...
カタログの4ページ目を開くFEMORAL NECK RESECTION A proper neck resection level directly affects the final placement and fit of the femoral stem. By using the anatomic landmarks referenced during pre-operative x-ray templating, the pre-planned neck resection is made with an oscillating saw and with the aid of the Neck Resection Guide. The guide helps the surgeon to determine the correct stem orientation and placement. After careful pre-operative templating, the guide is placed on the anterior/posterior aspect of the exposed proximal femur and the planned femoral neck cut is marked using a marking instrument of...
カタログの5ページ目を開くPREPARING THE FEMORAL CANAL To help ensure proper final orientation of the stem, lateral bias during implant preparation is preferred. Retraction of the gluteus medius and removal of the lateral cortical bone at the piriformis insertion will permit true axial introduction of the instruments and implant. The Modular Box Osteotome or a rongeur can be used to remove bone from this area (Figure 5). Tip Art Malkani, M.D. Remove the lateral cortical bone at the piriformis fossa to obtain ideal proximal fit and to minimize the risk of undersizing and/or varus placement of the femoral component....
カタログの6ページ目を開くThe ACCOLADE II Hip System is a broach only system. While use of an axial starter reamer is needed, use of cylindrical reamers is not necessary to prepare the femoral canal. The Axial Starter Reamer is used with the T-Handle to open the femoral canal and to aid in determining the orientation of the femoral axis. The tapered design allows for access to the canal and is graduated along the flutes, which helps provide a reference during insertion into the canal. Advance the Axial Starter Reamer into the femoral canal to a depth at which the first graduation mark is aligned with the medial...
カタログの7ページ目を開くNote ACCOLADE II broaches can be properly identified in several ways. 1) The broach size is engraved into a square pocket on both the anterior and posterior sides of the broach. 2) The size is marked on the top of the broach post. 3) The distal lateral tip of the broach is polished. 4) 1020-52xx part number Broaching is then performed beginning with the size 0 broach. The broach should be oriented to the long axis of the oblong shape created by the neck resection (Figure 7). Note Accolade and ACCOLADE II broaches cannot be used interchangeably. Tip Art Malkani, M.D. During broaching, place...
カタログの8ページ目を開くOPTIONAL STEP Relying only on the neck resection height alone for final seating height may lead to improper sizing and inadequate component fixation. The final broach should seat firmly against medial and lateral cortical bone (Figure 9). Tip Frank Kolisek, M.D. If the broach and/or stem stops above or below the original neck resection, leg length and soft-tissue tensioning must be re-assessed during intraoperative trialing. Do not force the broach and/or stem to the resection level. This will increase the risk of proximal femur fracture. Generally, if a broach sinks below the level of the...
カタログの9ページ目を開くTRIAL REDUCTION Select a Neck Trial which has the same base neck length and angle as the planned implant size. This can be determined in two ways. TIP Richard Rothman, M.D. Start with a standard offset (132°) neck trial. If the leg lengths are equal, but soft tissues are lax, move to a 127° degree neck trial. 1. Match the color indicator located on top of the Neck Trial taper to the color indicator on top of the broach (Figure 11). 2. The table below indicates the correct neck length for each size stem and the corresponding color code. The size of the broach directly corresponds to the size...
カタログの10ページ目を開くTip Richard Rothman, M.D. Remember, pre-operative templating serves as only a guide. Final sizing, leg length, and offset are determined intra-operatively. Tip Dermot Collopy, M.D. After trial reduction and prior to removing the broach, tap on the broach a few more times to see if it will advance. Due to the viscoelastic properties of the bone, the bone could relax during the trialing process. If the broach does advance, retrial and make adjustments accordingly. Assemble the Neck Trial onto the broach. Next, assemble a V40 Head Trial onto the Neck Trial (Figure 12). Femoral heads come in...
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