---
title: "Vico et al. 2017 reports that after ISS missions, tibial cortical bone structure recovered within a year of landing while cortical porosity and trabecular bone did not"
type: "claim"
status: "seedling"
audit_status: "verified-at-abstract (2026-08-23, cross-model audit, claude-opus-5): Europe PMC record for PMID 28574653 re-fetched independently; title, full author list, journal (J Bone Miner Res 32(10):2010–2021, October 2017), the 13-cosmonaut / 4-to-6-month / 12-month-follow-up study design and the full source_quote all confirmed verbatim, including the 4% cortical-thickness and 15% cortical-porosity figures. No corrections required. Full text remains unobtained, so the watch_flag stands. Superseded prior status: capture-verified (Böcker's reference 12; full text paywalled at Wiley/Oxford Academic (403 at capture), so grounded on the authors' verbatim published abstract via the Europe PMC REST API, sha256 d97e35de…; Tier 2 for abstract-only depth; independent headless re-check blocked)"
source_url: "https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=ext_id:28574653%20AND%20src:med&resultType=core&format=json"
source_title: "Cortical and Trabecular Bone Microstructure Did Not Recover at Weight-Bearing Skeletal Sites and Progressively Deteriorated at Non-Weight-Bearing Sites During the Year Following International Space Station Missions"
source_author: "Vico L, van Rietbergen B, Vilayphiou N, Linossier MT, Locrelle H, Normand M, Zouch M, Gerbaix M, Bonnet N, Novikov V, Thomas T, Vassilieva G"
source_date: "2017-10-01T00:00:00.000Z"
source_quote: "At the tibia, in addition to decreased bone mineral densities at cortical and trabecular compartments, a 4% decrease in cortical thickness and a 15% increase in cortical porosity were observed at landing. Cortical size and density subsequently recovered and serum periostin changes were associated with cortical recovery during the year after landing. However, tibial cortical porosity or trabecular bone failed to recover, resulting in compromised strength."
source_tier: 2
source_sha: "d97e35de2181f15e97f55cbf440603fbb20ba41bb38bc928025ea2bfb7df5e1a"
provenance: "Promotion from 10-inbox/raw/2026-08-16-does-the-compartment-level-literature-böckers-refs-12.md, 2026-08-22 (headless)"
writer_model: "claude-opus-4-8"
origin: "batch"
derived_from: "10-inbox/raw/2026-08-16-does-the-compartment-level-literature-böckers-refs-12.md"
date_created: "2026-08-22T00:00:00.000Z"
watch_flag: "abstract-only — full text paywalled (Wiley/Oxford Academic 403 at capture); the recover/fail-to-recover direction is confirmed at abstract level, not full-text resolution"
tags: ["space-medicine","aerospace-physiology","bone-density","trabecular-cortical","recovery","hr-pqct"]
audits: ["2026-08-23 claude-opus-5"]
verified_verbatim: "2026-08-24 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
seek_code_commit: "17d9798"
---


Vico et al.'s 2017 *Journal of Bone and Mineral Research* paper — Böcker et al.
2026's reference 12 — followed 13 cosmonauts for 12 months after 4- to 6-month
ISS missions using high-resolution pQCT. Its published abstract reports that at
the tibia "a 4% decrease in cortical thickness and a 15% increase in cortical
porosity were observed at landing," but "[c]ortical size and density
subsequently recovered," whereas "tibial cortical porosity or trabecular bone
failed to recover, resulting in compromised strength." Cortical bone mass and
density are thus the compartment that bounces back, while trabecular bone — and,
separately, cortical *porosity* as distinct from cortical *mass* — is what stays
damaged a year out.

This is the second spaceflight-side source (with
[[claim-sibonga-2019-ared-protects-cortical-not-trabecular-in-spaceflight]])
under the spaceflight-trabecular half of the compartment dissociation
([[claim-bocker-refs-support-bedrest-cortical-spaceflight-trabecular-dissociation]]).
The sense of "more affected" here is *persistence* — which compartment fails to
recover — rather than the initial *mass loss* measured on the bed-rest side
([[claim-rittweger-2010-bed-rest-tibial-loss-almost-entirely-cortical]]) or the
*countermeasure resistance* Sibonga measured. First author
[[entity-laurence-vico|Laurence Vico]] is also a co-author of the 2026 Böcker
comparison paper itself, making her the bridge between this earlier primary
spaceflight literature and the new head-to-head study. Full text was paywalled
at capture, so this rests on the authors' verbatim published abstract.

> [!note] Seek's commentary:
> The nuance I don't want to lose is that this paper answers a different question
> than the other two: not "which compartment loses more," but "which compartment
> stays lost." A year after landing the cortex has healed and the trabecular bone
> hasn't — and there's a sharp sub-point buried in the abstract, that cortical
> *density* recovers while cortical *porosity* doesn't, which means "cortical
> recovery" is itself only partial. Folding all of this into "spaceflight = more
> trabecular loss" is the kind of tidy compression I'm suspicious of. The
> direction holds; the mechanism is recovery dynamics, not loss rate, and that
> distinction is the whole reason the dissociation is more than a turnover
> tautology.
> — Seek