Proximal Humerus surgical technique

Transcription

1 Proximal Humerus surgical technique

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3 Proximal Humerus surgical technique MUTARS was developed in co-operation with Prof. Dr. W. Winkelmann, and Prof. Dr. G. Gosheger, Clinic and Polyclinic for General Orthopedics at the University Hospital of Münster, Germany. MUTARS has been in successful clinical use since 1992 Table of Contents Table of Contents...1 Information about the Silver Coating...2 System overview...3 Assembling options/reconstruction length...4 Surgical technique...5 Implants...13 Instruments...14 Nota Bene: The described surgical technique is the suggested treatment for the uncomplicated procedure. In the final analysis the preferred treatment is that which addresses the needs of the individual patient. Copyright note: MUTARS, implavit and implatan are registered trademarks of implantcast GmbH. The use and copy of the content of this brochure are only allowed with prior permit given by the implantcast GmbH. 1

4 The Silver coating Early and late infections represent the most severe complications of tumour arthroplastic treatments. Although local and systemic antibiotic treatments are considered, the scientific literature reports of infection rates from 5 to 35 percent. Reasons for these high rates are, for example, the long surgery time, the large incisions, the immunosupression due to chemo therapy and radio therapy as well as the increasing resistance of the bacteria against antibiotic drugs. The anti-infective effect of silver ions has been known for centuries i.e. the disinfection of potable water is based on this principle. This special property of silver is used for the silver coated components of MUTARS to build an intelligent protection against bacteria. Until now only non-articulating surfaces and surfaces without direct bony contact are coated with silver. In the catalogue information of this brochure you can find the supplement *S indicating which MUTARS components are available in a silver coated version. The eight digit REF number receives an addition after the last digit (e.g S). It is not permitted to flush the wound with antiseptics that contain Iodine or heavy metals (such as Betaisodona ) Iodine and Silver form insoluble salt complexes not only with the silver ions that are released postoperatively but also with the silver layer of the implant that will be covered with an insoluble silveriodine (AgI) film. This will destroy the anti-adhesive protective layer irreversibly. Iodine or heavy metal based antiseptics may not be used at any time. Alternatively solutions containing H 2 O 2 (like Lavasept, Prontosan or similar) can be used. The silver coating can be destroyed in its function by two factors: large amounts of albumin from seroma or hematoma can bind larger amounts of silver (1 mol Albumin inactivates 3 moles Silver ions). This should be minimized by using an attachment tube. In the instance that an infection is known pre-operatively, antibiotics like Vancomycin can be mixed with the bone cement. The intramedullary stems are not silver coated and cemented components are preferred in case of a septic revision. The TiN coating for allergy prophylaxis As the metallic components of total knee replacements, the articulating metallic parts of the MUTARS system are made of casted CoCrMo alloy. In the late 70 s and 80 s of the last century, some of the Cobalt Chromium implants had a small Nickel content to add strength to the implant. Nickel is the primary cause for metal sensitivity, although some patients have shown to be hypersensitive to other metals such as Cobalt and Chromium. The use of titanium components can t solve this problem, because the wear of the articulating polyethylene inlays will increase and so the survival time of the prosthesis is reduced. Since the end of the 1990 s TiN (Titanium Nitride coating) has been successfully applied to protect the body against metal ions that could cause allergic reactions. The metal ion release of TiN coated or TiNbN coated implants is reduced down to 10%. 1 In order to prevent allergic reactions, certain parts of the prosthesis may be supplied with a ceramic coating (TiN). Since almost all components of the tumor system consist of titanium alloy, this only concerns those components, which are made of a cast CoCr alloy (CoCrMo). The REF-numbers of the TiN coated implants have the suffix N after the last digit (e.g N). *S: For anti-infective treatment, silver coated implants are available. *N: For anti-allergic treatment, TiN coated implants are available. 1 Metal Ion Release from Non-Coated and Ceramic Coated Femoral Knee Components: Boil test 240h in NaCl-solution nach FMZ PhysWerk VA 97350, University Würzburg (D) (On File) 2

5 System Overview humerus cap small, medium, large reconstruction 160 mm humerus head humerus extension piece 20, 40, 60 mm reconstruction 60 mm humerus connecting part 80 mm 75 mm humerus stem 8, 9, 10, 11, 12, 13 mm cementless 8, 9, 10, 11, 12 mm cemented 3

6 MUTARS Proximal Humerus assembling options by using a MUTARS humerus cap medium (length in mm) components reconstruction head Extension piece/ connecting part 80 mm screw Note: Please notice that the amount of implants and instruments send with an individual shipment may differ from the information in the catalogue information of this brochure. Please make sure, during the preoperatively planning, that all necessary implants and instruments are available for the surgery. 4

7 Tumor resection Resect the tumour and measure the length of the explant. The minimum bone resection is 60mm. Humeral bone preparation Ream the medullary cavity with the medullary cavity reamer (fig. 1). Cementless use figure 1 Drill the medullary cavity with a humerus drill that is 1 mm smaller than the size of the preoperatively chosen humerus stem (fig. 2). Cemented use Drill the medullary cavity with a humerus drill that is 2 mm larger than the size of the preoperatively chosen humerus stem (fig. 2). figure 2 5

8 Rasping of the humeral cavity Assemble the humeral rasp of the appropriated size (see tables below), the extractor device, the humerus impactor and the sleeve. Lock the rasp on to the humerus impactor by using the counter wrench. Extractor device Remark The use of a humeral rasp for a cemented stem is optional. Generally you can proceed with the trial assembly. Use of cementless stems Use the humeral rasp (fig. 3), of the same size as the preoperatively chosen humerus stem (table 1). Humerus impactor Stem size 9mm 10mm 11mm 12mm 13mm table 1 Rasp size 9mm 10mm 11mm 12mm 13mm rasp Counter wrench Optional technique for the use of cemented stems If you want to prepare for a cemented stem with the humeral rasp, please use the rasp which is 2 mm larger than the preoperatively chosen cemented humerus stem (fig. 3). figure 3 That will provide a cement mantle of 1mm thickness (table 2). Stem size 8mm 9mm 10mm table 2 Rasp size 10mm 11mm 12mm 6

9 Rasp the medullary cavity with the chosen humeral rasp (fig. 4a and 4b). A carefully use of the mallet is recommended. Remark It is recommended to clean the rasp of bone chips during the rasping. Leave the humeral rasp in the bone for the trialing. figure 4a figure 4b 7

10 Trial reduction with trial components Mount the humerus trial head and the possibly used trial extension pieces (possible enlargement from 20 to 200 mm; see table page2) onto the top of the rasp (fig. 5a). Remark For the cemented procedure humeral rasps are usually not available. Please insert the cemented stem (without cement) for trialing purposes. Insert the trial bar screw of the correct length and lock it with the socket wrench (fig. 5b). figure 5a and 5b Put the humerus trial cap, which belongs to the size of the preoperative chosen humerus cap (small, medium or large) on the head (fig. 6). Perform a trial reduction and control the muscle tension. Remove the humerus trial cap, the humerus head and the humeral rasp when sufficient stability is achieved. figure 6 8

11 Implantation of the humerus stem Impact the MUTARS humerus stem (fig. 7). Insert the stem of the same size as the rasp if a cementless stem is used. It is possible to protect the humerus stem against rotation by the use of a 3,5 mm cortical screw. If a cemented implantation is planned, insert the cement and use the cemented stem which is 2 mm smaller than the previously used drill or rasp. Remove all instruments, especially during the cement hardening to prevent bending moments. figure 7 9

12 Implantation of the proximal components Combine the proximal implant components on the humerus stem. Lock the components in the correct rotational alignment with the bar screw of correct length (see table on page 2) by the use of the socket wrench small (fig. 8). Final trialing Use again the trial cap to control the muscle tension (fig. 9). figure 8a and 8b Remove the humerus trial cap when sufficient tension is achieved. figure 9 10

13 Final implant assembly Readjust the rotation if necessary and lock the screw of the correct length (see table on page 2). Use the MUTARS socket wrench small and secure the assembly with the counter instruments (fig. 10a). Lock the humerus safety screw in the same way (fig. 10b) Screw the chosen humerus cap on the humeral head. Tighten the humerus cap with the MUTARS wrench for cap/counter instrument and secure it with the wrench for humerus (fig. 11). figure 10a figure 10b figure 11 11

14 The use of the attachment tube Fasten the attachment tube. Fix the tube proximal first than distal. Pull the tube over the joint capsule and fix the tube to the capsule wall. Afterwards tighten the tube and fix it over and under the pads of the MUTARS components (fig. 12a and fig. 12b). Fix muscles and tendon tissues with sutures to the meshes of the tube (fig. 13a. and fig. 13b). figure 12a figure 12b figure 13a figure 13b 12

15 IMPLANTS *S: For anti-infective treatment, silver coated implants are available. *N: For anti-allergic treatment, TiN coated implants are available. MUTARS humerus cap mat.: implatan ; TiAl 6 V 4 acc. to DIN ISO 5832/3 with TiN-coating small medium large MUTARS humerus head *S mat.: implatan ; TiAl 6 V 4 according to DIN ISO 5832/ MUTARS humerus screw mat.: implatan ; TiAl 6 V 4 according to DIN ISO 5832/ M8x15 mm M8x35 mm M8x55 mm M8x75 mm MUTARS humerus stem cementless mat.: implatan ; TiAl 6 V 4 according to DIN ISO 5832/ mm mm mm mm mm mm MUTARS humerus stem cemented *N mat.: implatvit ; CoCrMo-casting alloy according to DIN ISO 5832/ mm mm mm mm mm special stem sizes are available on request. 13

16 IMPLANTS MUTARS humerus extension piece *S mat.: implatan ; TiAl 6 V 4 according to DIN ISO 5832/ mm mm mm MUTARS humerus connecting part *S mat.: implatan ; TiAl 6 V 4 according to DIN ISO 5832/ MUTARS Anbindungsschlauch Mat.: Polyethylenterephtalat mm mm INSTRUMENTS MUTARS humerus instrument tray MUTARS humerus trial component tray

17 INSTRUMENTS MUTARS extractor device MUTARS socket wrench small MUTARS medullary cavity reamer MUTARS humerus drill 7 mm mm mm mm mm mm MUTARS humeral rasp 9 mm mm mm mm mm MUTARS humerus impactor MUTARS humerus impact and extract sleeve MUTARS humerus wrench for cap/ counter instrument MUTARS wrench for humerus MUTARS humerus trial cap small medium large 15

18 INSTRUMENTS MUTARS humerus trial cap with taper small medium large MUTARS humerus trial head MUTARS humerus trial extension piece mm mm mm MUTARS humerus trial reducer mm mm MUTARS humerus trial connecting part 80 mm MUTARS humerus trial screw M8x15 mm M8x35 mm M8x55 mm M8x75 mm 16

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20 Your local distributor: implantcast GmbH Lüneburger Schanze 26 D Buxtehude Germany phone: fax: internet: MUTD1OPE *+E1ICMUTD1OPE++* *+$$E1IC *