"depressed surface" is correct and can be used in written English.
You can use "depressed surface" to indicate a surface that has been depressed or lowered. For example, "The boulder had a depressed surface that acted as a bowl for collecting water."
The defects were clearly distinguishable on MRI three and six months postoperative with a persistent large defect in the empty defects and smooth and slightly depressed surface of non-hyaline tissue in the MACI group (Fig. 4).
For both pattern types, the majority of the neurite length is located in depressed surface features.
On both uni- and multidirectional patterns, the majority of the neurite path length is located in depressed surface features but significantly more feature crossing events occur on multidirectional surfaces.
Regions of high evaporation have elevated surface salinities, while regions of high precipitation have depressed surface salinities.
Vernal pools are found in Mediterranean climates worldwide, but are also present wherever strong seasonal precipitation patterns occur on flat or depressed surfaces that allow for prolonged inundation (Keeley and Zedler 1998; Deil 2005; Aponte et al. 2010).
One of the models contains a depressed topographic surface, and another contains an uplifted topographic surface.
A Caspar distractor is then fixed on these wires in order to correct the varus deformity of the great tuberosity and to open the subtalar joint facilitating the reduction of depressed calcaneal surface (Fig. 2).
A 2-cm incision is located on the lateral-posterior calcaneal wall, and the sinus tarsi is approached by visualizing the depressed articular surface and relative numbers of fragments: usually a smooth periosteum elevator is utilized, under image intensifier control, to lift and relocate the articular process (Fig. 4) temporary stabilized with K-wires.
The oral view of the present fossils and micro-CT images show a deeply depressed oral surface with radial ridges as described above.
The next step is the reduction of the depressed articular surface.
X-ray image of the lateral view showed depressed articular surface of the PIP joint (Fig. 2).
