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  • ASTM
    F1223-08(2012) Standard Test Method for Determination of Total Knee Replacement Constraint
    Edition: 2012
    $93.60
    Unlimited Users per year

Description of ASTM-F1223 2012

ASTM F1223 - 08(2012)

Standard Test Method for Determination of Total Knee Replacement Constraint

Active Standard ASTM F1223 | Developed by Subcommittee: F04.22

Book of Standards Volume: 13.01




ASTM F1223

Significance and Use

4.1 This test method, when applied to available products and proposed prototypes, is meant to provide a database of product functionality capabilities (in light of the suggested test regimens) that is hoped will aid the physician in making a more informed total knee replacement (TKR) selection.

4.2 A proper matching of TKR functional restorative capabilities and the recipient's (patient's) needs is more likely to be provided by a rational testing protocol of the implant in an effort to reveal certain device characteristics pertinent to the selection process.

4.3 The TKR product designs are varied and offer a wide range of constraint (stability). The constraint of the TKR in the in vitro condition depends on several geometrical and kinematic interactions among the implant's components which can be identified and quantified. The degree of TKR's kinematic interactions should correspond to the recipient's needs as determined by the physician during clinical examination.

4.4 For mobile bearing knee systems, the constraint of the entire implant construct shall be characterized. Constraint of mobile bearings is dictated by design features at both the inferior and superior articulating interfaces.

4.5 The methodology, utility, and limitations of constraint/laxity testing are discussed. 3, 4 The authors recognize that evaluating isolated implants (that is, without soft tissues) does not directly predict in vivo behavior, but will allow comparisons among designs. Constraint testing is also useful for characterizing implant performance at extreme ranges of motion which may be encountered in vivo at varying frequencies, depending on the patients anatomy, pre-operative capability, and post-operative activities and lifestyle.

1. Scope

1.1 This test method covers the establishment of a database of total knee replacement (TKR) motion characteristics with the intent of developing guidelines for the assignment of constraint criteria to TKR designs. (See the Rationale in Appendix X1 .)

1.2 This test method covers the means by which a TKR constraint may be quantified according to motion delineated by the inherent articular design as determined under specific loading conditions in an in vitro environment.

1.3 Tests deemed applicable to the constraint determination are antero-posterior draw, medio-lateral shear, rotary laxity, valgus-varus rotation, and distraction, as applicable. Also covered is the identification of geometrical parameters of the contacting surfaces which would influence this motion and the means of reporting the test results. (See Practices E4 .)

1.4 This test method is not a wear test.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

E4 Practices for Force Verification of Testing Machines

F2083 Specification for Total Knee Prosthesis


Keywords

arthroplasty; constraint; joint; laxity; prosthesis; total knee replacement;


ICS Code

ICS Number Code 11.040.40 (Implants for surgery, prothetics and orthotics)


DOI: 10.1520/F1223-08R12

ASTM International is a member of CrossRef.

ASTM F1223

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