Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13023-023-02641-5/MediaObjects/13023_2023_2641_Fig1_HTML.png)
Examples of coronal and transverse magnetic resonance images in four adult participants with achondroplasia: two participants without spinal stenosis (to the left), and two participants with symptomatic spinal stenosis (to the right). The performance in the six-minute walk test (6MWT) and muscle fat infiltration (MFI) in the anterior compartment are provided for each of the participants. Muscle compartments are displayed in color