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KAREY

Product catalog summary

Overview: The document details the specifications and surgical procedures for the KAREY stem instrumentation set, used in hip replacement surgeries. It covers both cemented (KAREY-C) and cementless (KAREY-HA) stems, focusing on their technical features and implantation techniques.

Specifications:

The KAREY-HA stem is constructed from titanium alloy (Ti6Al4V) with a semicircular metaphyseal macrostructure to enhance contact surface and prevent subsidence.
The KAREY-C stem is cemented, requiring specific implantation steps such as cavity cleaning and bone cement insertion.
Both stems utilize the same instrumentation for implantation.

Technical Details:

The HA coating is applied via Air Plasma Spraying, with a thickness of 130 microns.
The stem is divided into proximal (trapezoidal shape for stability) and distal (progressively subsized to reduce rigidity) portions.
Longitudinal grooves enhance bone-implant contact and reduce distal rigidity.

Surgical Technique:

Surgical Approach: The approach is chosen based on surgeon preference for optimal visualization of the acetabulum and proximal femur.
Femoral Neck Osteotomy: Executed at a 45º angle using a femoral template on preoperative X-rays.
Femoral Preparation: Involves opening the femoral canal with a hollow box chisel and using progressively larger rasps to establish anteversion.
Trial Reduction: Conducted with trial heads to select the appropriate neck length, ensuring stability and leg length.
Femoral Component Insertion: The definitive stem matches the last rasp size used, inserted with an impactor to the desired depth.

Recommendations:

Ensure proper cleaning and preparation for cemented stems.
Use trial femoral heads to confirm neck length before final implantation.

Technical Specifications:
The document describes the surgical technique for implanting the KAREY-HA and KAREY-C femoral stems. The KAREY-HA is a cementless primary stem made from titanium alloy (Ti6Al4V) with a trapezoidal proximal portion for stability and a progressively subsized distal portion to reduce rigidity and enhance bone growth. The HA coating is applied using Air Plasma Spraying.

Surgical Procedure:
1. Femoral Neck Osteotomy: The osteotomy is performed at a 45º angle using a femoral template on a preoperative X-ray.
2. Femoral Preparation: The femoral canal is opened using a hollow box chisel, followed by a manual conical reamer. Rasping is done sequentially with increasing sizes until cortical chatter is found, establishing anteversion.
3. Trial Reduction: With the rasp in place, trial heads are used to select the appropriate neck length, testing for stability, tightness, and leg length.
4. Femoral Component Insertion: The definitive stem, matching the last rasp size, is inserted using an impactor handle. Longitudinal grooves on the stem increase bone-implant contact and reduce distal rigidity.

Instrumentation and Implants:
The document lists various instruments and implants, including rasps, trial heads, and impactors, with references for each component. Both KAREY-HA and KAREY-C stems use the same instrumentation, with additional steps for cemented stems like cavity cleaning and cement insertion.

Key Features:
- The metaphyseal macrostructures prevent subsidence and provide an antivaro effect.
- The distal portion's progressive subsizing avoids diaphyseal filling and reduces stress shielding.
- The document includes references for different neck lengths and materials available for femoral heads.

Catalog excerpts

Instrumental Instruments Set completo instrumental vástago KAREY KAREY Stem instrumentation complete set Ref. F0005005 Bandeja superior Upper tray 2 Cabezas femorales de prueba para raspas KAREY Rasps Femoral trial heads for rasps Short Neck Long Neck Ref. A1550043 Ø 28 C/XL Extra Long Neck Short Neck Long Neck Ref. A1550053 Ø 26 C/XL Extra Long Neck 3 Cabezas femorales de prueba para vástagos 12/14 Femoral trial heads for stems 12/14 Ref. A1536043 Ø 28 C/XL Extra Long Neck Ref. A1536053 Ø 26 C/XL Extra Long Neck Short Neck Long Neck Short Neck Long Neck Bandeja inferior Lower tray 5 Punzón impactador para vástago 2 Fresa iniciadora endomedular Endomedullary starting reamer 6 Mango impactor vástago definitivo 4 7 Varilla para mango de raspa Tommy bar for rasp handle Impactor handle definitive stem 4 Extractor para cabeza femoral 8 Mango automático para raspas Femoral head extractor Automatic handles for rasps Tecnología Europea de Vanguardia Advanced European Technology Implantes Implants Cabezas femorales de cerámica Ceramique femoral heads Vástago KAREY KAREY Stem Short Neck Long Neck Short Neck Karey-C Cabezas femorales de acero inoxidable* Stainless-steel femoral heads* Long Neck Short Neck Ref. A1509043E Ø 28 C/XL Extra Long Neck Ref. A1509053E Ø 26 C/XL Extra Long Neck *Disponible cabeza femoral en Cromo Cobalto *Avaible femoral head Cobalt-Chrome Long Neck Short Neck Long Neck Parque Tecnológico C/ Leonardo Da vinci, 12-14 · 46980 · Paterna · Valencia · España Tel. (+34) 96 131 80 50 · Fax (+34) 96 131 80 95 e-mail: [email protected] www.surgival.com

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Técnica Quirúrgica Surgical Technique Características técnicas Technical details El vástago primario KAREY- HA sin cemento está fabricado en aleación de titanio (Ti6Al4V). The cementless KAREY- HA primary stem is manufactured in titanium alloy (Ti6Al4V). Vástago rectilíneo de sección cuadrangular dividido en dos porciones: Straight stem of quandrangular section divided into two portions: a) Proximal o metafisaria, con forma trapezoidal en los planos sagital y frontal, para conseguir una estabilidad primaria tridimensional y evitar el hundimiento protésico. a) Proximal or metaphyseal, trapezoidal...

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