Similar to the upper arm, the forearm contains an anterior and posterior compartment. There are more muscles in the forearm, and anatomists further organize muscles in each compartment into layers.

To confirm the suspected diagnosis of compartment syndrome, a Stryker quick-pressure monitor (a side-port needle) was inserted and revealed an anterior compartment pressure of 87 mm Hg.

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Muscle edema in forearm forces Carlos Alcaraz to withdraw from Rome Masters "I need to rest so I can recover and play 100% pain-free," Alcaraz said in a statement posted to social media.

Fasciotomy is a surgical procedure where the fascia is incised to relieve the compartmental pressure in patients with the compartment syndrome in the limbs.

It was thought a muscle or ligament tear could cause hemorrhaging leading to noncompressible compartment syndrome. However, this did not explain the hard forearm compartment.