"external instability" is a correct and usable phrase in written English.
You can use "external instability" when discussing a situation or condition that is caused by factors outside of a specific entity or system. It typically refers to external factors that can cause difficulties, disruptions, or unpredictability. Example: The country's economy is facing challenges due to a combination of internal corruption and external instability caused by global market fluctuations.
Another set of circumstances might be a crisis caused by external instability, such as by conflict in the Korean peninsula or a real rearmament in Japan, which might offer some factions in China a motive to challenge the ruling group, which on present trends might by then have become seen as too pro-American or at least too acquiescent to America.
Although the first radiographic observation of the so-called Segond's fracture dates back to 1936 [2], it is only recently [3, 4, 5, 6, 7] that the importance of identifying this fracture with an X-ray has been emphasized, in order to ensure a more accurate assessment of the external instability of the knee.
This can correct not only varus, but also external rotary instability.
Secondary survey revealed pelvic instability, external rotation deformity of the left lower limb, a groin wound extending to the left thigh overlying the course of the major vessels with gross contamination, intact bilateral dorsalis pedis pulses and posterior tibial pulses.
Last, based on the stiffness of the external force, the instability for adhesive rough surfaces in contact was also discussed, and it was postulated that a high peak value of the external force stiffness directly relates to the unstable contact process.
Integration of knowledge generated through steps 5 and 6 in order to explain somatic cancer evolution in individual patients on the basis of genetic instability, external selection forces and the internal effects of the genome architecture on genes and regulatory elements.
A major disadvantage of therapeutic proteins is their instability to external stressors during storage, transport and use.
However, we should note that substorms are classified into two types in terms of their occurrence mechanisms, that is, external trigger or internal instability.
Environmental dynamism (ED) describes the rate of change, unpredictability, volatility and instability in external environment (Hoskisson et al. 2000; Jansen et al. 2009).
Several studies theoretical and experimental show that continuous fluidised bed layering granulation with external classification can show instability in the form of self-sustained oscillations.
As there are numerous reports of the use of a hinged external fixator for elbow instability after fracture dislocation of the elbow and severe distal humeral fracture [8, 9, 14, 17], the use of such a device in children has not been reported yet.
