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<!-- Version: 6.20.1 -->
<!-- Round: 7 -->
<!-- Creation date: 2012-11-05T01:10:10Z -->
<!-- Copyright (c) 2005-2012 R.R. Donnelley &amp; Sons Company All Rights Reserved. -->
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        <link:definition>110 - Disclosure - Acquisitions</link:definition>
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        <link:definition>112 - Disclosure - License and Developmental Consulting Agreements</link:definition>
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        <link:definition>115 - Disclosure - Net Loss Per Share</link:definition>
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        <link:definition>125 - Disclosure - Net Loss Per Share (Tables)</link:definition>
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        <link:definition>127 - Disclosure - The Company and Basis of Presentation - Additional Information (Detail)</link:definition>
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        <link:definition>128 - Disclosure - Acquisitions - Additional Information (Detail)</link:definition>
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  <element name="AmortizationOfIntangibleAsset" id="atec_AmortizationOfIntangibleAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BalanceSheetComponentsLineItems" id="atec_BalanceSheetComponentsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BalanceSheetComponentsTable" id="atec_BalanceSheetComponentsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CapitalLeaseObligationsAndOperatingLeaseLineItems" id="atec_CapitalLeaseObligationsAndOperatingLeaseLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLeaseObligationsAndOperatingLeaseTable" id="atec_CapitalLeaseObligationsAndOperatingLeaseTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CapitalLeasePrincipalAmount" id="atec_CapitalLeasePrincipalAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CapitalLeasesInterestPercentage" id="atec_CapitalLeasesInterestPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashPaidToSubsidiary" id="atec_CashPaidToSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CibramedMember" id="atec_CibramedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentToPurchaseSharesOfCommonStockAmountMaximum" id="atec_CommitmentToPurchaseSharesOfCommonStockAmountMaximum" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommonStockCommitmentFee" id="atec_CommonStockCommitmentFee" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ConsultingFees" id="atec_ConsultingFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CoreTechnologyMember" id="atec_CoreTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DevelopedProductTechnologyMember" id="atec_DevelopedProductTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAccountsReceivableAbstract" id="atec_DisclosureAccountsReceivableAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAdditionalInformationAbstract" id="atec_DisclosureAcquisitionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" id="atec_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCompanyAndBasisOfPresentationAdditionalInformationAbstract" id="atec_DisclosureCompanyAndBasisOfPresentationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtAdditionalInformationAbstract" id="atec_DisclosureDebtAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureEquityTransactionsAdditionalInformationAbstract" id="atec_DisclosureEquityTransactionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFutureMinimumAnnualLeasePaymentsAbstract" id="atec_DisclosureFutureMinimumAnnualLeasePaymentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIncomeTaxesAdditionalInformationAbstract" id="atec_DisclosureIncomeTaxesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsAbstract" id="atec_DisclosureIntangibleAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureInventoriesAbstract" id="atec_DisclosureInventoriesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureLicenseAndDevelopmentalConsultingAgreementsAdditionalInformationAbstract" id="atec_DisclosureLicenseAndDevelopmentalConsultingAgreementsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePrincipalPaymentsOnDebtAbstract" id="atec_DisclosurePrincipalPaymentsOnDebtAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosurePropertyAndEquipmentAbstract" id="atec_DisclosurePropertyAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" id="atec_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfLongLivedAssetsByGeographicalAreasAbstract" id="atec_DisclosureScheduleOfLongLivedAssetsByGeographicalAreasAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureScheduleOfRevenuesAttributedToGeographicLocationAbstract" id="atec_DisclosureScheduleOfRevenuesAttributedToGeographicLocationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentAndGeographicalInformationAdditionalInformationAbstract" id="atec_DisclosureSegmentAndGeographicalInformationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSelectBalanceSheetDetailsAdditionalInformationAbstract" id="atec_DisclosureSelectBalanceSheetDetailsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSubsequentEventsAdditionalInformationAbstract" id="atec_DisclosureSubsequentEventsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureWeightedAverageAntiDilutiveSecuritiesNotIncludedInDilutedNetLossPerShareAbstract" id="atec_DisclosureWeightedAverageAntiDilutiveSecuritiesNotIncludedInDilutedNetLossPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureWeightedAverageNumberOfCommonSharesOutstandingAbstract" id="atec_DisclosureWeightedAverageNumberOfCommonSharesOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DistributionNetworkMember" id="atec_DistributionNetworkMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentDocumentandEntityInformationAbstract" id="atec_DocumentDocumentandEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarningsPerShareLineItems" id="atec_EarningsPerShareLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EarningsPerShareTable" id="atec_EarningsPerShareTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="EclipseAdvisorsLlcMember" id="atec_EclipseAdvisorsLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EntityWideRevenuePercentageNotExceedToMajorCustomer" id="atec_EntityWideRevenuePercentageNotExceedToMajorCustomer" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EscrowToSecureIndemnificationObligationsMember" id="atec_EscrowToSecureIndemnificationObligationsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EurosurgicalMember" id="atec_EurosurgicalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteLivedCoreTechnologyGross" id="atec_FiniteLivedCoreTechnologyGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteLivedDevelopedProductTechnologyGross" id="atec_FiniteLivedDevelopedProductTechnologyGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteLivedDistributionNetworkGross" id="atec_FiniteLivedDistributionNetworkGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteLivedPhysicianEducationProgramsGross" id="atec_FiniteLivedPhysicianEducationProgramsGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="HealthpointCapitalMember" id="atec_HealthpointCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IndefiniteLivedInProcessTechnology" id="atec_IndefiniteLivedInProcessTechnology" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InProcessTechnologyMember" id="atec_InProcessTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntangibleAssetsGrossExcludingGoodwill" id="atec_IntangibleAssetsGrossExcludingGoodwill" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntangibleAssetsTableTextBlock" id="atec_IntangibleAssetsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntellectualPropertyMember" id="atec_IntellectualPropertyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InternationalMember" id="atec_InternationalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InventoryLineItems" id="atec_InventoryLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InventoryTable" id="atec_InventoryTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="LineOfCreditFacilityBasisSpreadOnPrimeRate" id="atec_LineOfCreditFacilityBasisSpreadOnPrimeRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermDebtAndCapitalLeaseObligationsGross" id="atec_LongTermDebtAndCapitalLeaseObligationsGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LongTermDebtMaturitiesCapitalLeaseRepaymentsOfPrincipal" id="atec_LongTermDebtMaturitiesCapitalLeaseRepaymentsOfPrincipal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumPercentageOfCommittedSharesOfCommonStockAfterSendingCancellationNotice" id="atec_MaximumPercentageOfCommittedSharesOfCommonStockAfterSendingCancellationNotice" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MerlotOrthoAgreementMember" id="atec_MerlotOrthoAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfGeographicRegions" id="atec_NumberOfGeographicRegions" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfMarketProductsSold" id="atec_NumberOfMarketProductsSold" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfRestrictedCommonStockIssued" id="atec_NumberOfRestrictedCommonStockIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfTradingDaysTakenForEstimatingSharesForIssuance" id="atec_NumberOfTradingDaysTakenForEstimatingSharesForIssuance" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfTranchesToPurchaseCommonStock" id="atec_NumberOfTranchesToPurchaseCommonStock" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfUnregisteredCommonSharesIssuedToSubsidiary" id="atec_NumberOfUnregisteredCommonSharesIssuedToSubsidiary" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrthotecMatterMember" id="atec_OrthotecMatterMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentUnderMutualTerminationAgreement" id="atec_PaymentUnderMutualTerminationAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCommonStockToBePurchaseOnSixteenthDayAfterDateOfPutNotice" id="atec_PercentageOfCommonStockToBePurchaseOnSixteenthDayAfterDateOfPutNotice" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfCommonStockToBePurchaseOnThirtyFirstDayAfterDateOfPutNotice" id="atec_PercentageOfCommonStockToBePurchaseOnThirtyFirstDayAfterDateOfPutNotice" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfVolumeWeightedAveragePriceOfCommonStockUsedToDeterminePerSharePrice" id="atec_PercentageOfVolumeWeightedAveragePriceOfCommonStockUsedToDeterminePerSharePrice" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodForPurchaseCommonStockInTwoTranches" id="atec_PeriodForPurchaseCommonStockInTwoTranches" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodInUnrecognizedTaxBenefit" id="atec_PeriodInUnrecognizedTaxBenefit" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodToPurchaseCommittedSharesOfCommonStock" id="atec_PeriodToPurchaseCommittedSharesOfCommonStock" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PhygenLlcMember" id="atec_PhygenLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PhysicianEducationProgramsMember" id="atec_PhysicianEducationProgramsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalPaymentOfDebtTableTextBlock" id="atec_PrincipalPaymentOfDebtTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReductionOfAccruedRoyalties" id="atec_ReductionOfAccruedRoyalties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RetentionOfRestrictedStockPreviouslyIssuedByEntity" id="atec_RetentionOfRestrictedStockPreviouslyIssuedByEntity" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAccountsReceivableTable" id="atec_ScheduleOfAccountsReceivableTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfAssetsBySegmentLineItems" id="atec_ScheduleOfAssetsBySegmentLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfAssetsBySegmentTable" id="atec_ScheduleOfAssetsBySegmentTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfFutureMinimumAnnualLeasePaymentsOperatingAndCapitalLeasesTableTextBlock" id="atec_ScheduleOfFutureMinimumAnnualLeasePaymentsOperatingAndCapitalLeasesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfRevenuesAttributedToGeographicLocationTableTextBlock" id="atec_ScheduleOfRevenuesAttributedToGeographicLocationTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SupplyAgreementMember" id="atec_SupplyAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TemporaryEquityCarryingAmounts" id="atec_TemporaryEquityCarryingAmounts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TermLoanMember" id="atec_TermLoanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TermsToPurchaseCommonStockUnderTrancheOne" id="atec_TermsToPurchaseCommonStockUnderTrancheOne" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TermsToPurchaseCommonStockUnderTrancheTwo" id="atec_TermsToPurchaseCommonStockUnderTrancheTwo" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnamortizedDebtIssuanceAndDebtDiscount" id="atec_UnamortizedDebtIssuanceAndDebtDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariousUsefulLifeOfPropertyAndEquipments" id="atec_VariousUsefulLifeOfPropertyAndEquipments" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPercentageOfWarrantsForPeriodFour" id="atec_VestingPercentageOfWarrantsForPeriodFour" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPercentageOfWarrantsForPeriodOne" id="atec_VestingPercentageOfWarrantsForPeriodOne" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPercentageOfWarrantsForPeriodThree" id="atec_VestingPercentageOfWarrantsForPeriodThree" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingPercentageOfWarrantsForPeriodTwo" id="atec_VestingPercentageOfWarrantsForPeriodTwo" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsExpirationDate" id="atec_WarrantsExpirationDate" type="us-types:dateStringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WorkingCapitalLineOfCreditMember" id="atec_WorkingCapitalLineOfCreditMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
