Comprised of two muscles, your calf begins above the knee joint and ends at the heel, via tendon attachments. Strain to the muscles or tendons leads to pain and sometimes immobility. Popping sensations or noises while climbing stairs can stem from soft tissue tears or ruptures. Pain and difficulty walking are common side effects of this injury, but degrees of each symptom may differ. Consult your physician to determine an injury and treatment plan.
Lower Leg Anatomy
Calf muscles are vital to bipedal locomotion, powering your walk and allowing you to rise onto your toes. The gastrocnemius, the larger muscle, begins above your knee joint, while the soleus originates below the knee. Both muscles connect to your heel via the Achilles tendon. Your calf is responsible for plantar flexion -- or pointing your toes -- which is needed to push your foot off the ground during movement. The gastrocnemius also helps to bend your leg at the knee.
Calf Muscle Strain
A muscle injury -- i.e. a "pulled" muscle -- is called a strain. Strains can range from grade one, or mild, to a grade three, full rupture where 90 percent or more of the fibers are torn. (ref 1) Minor pain accompanies a grade one strain; a twinge is typically felt, but continued movement is possible. Second grade strains cause sharp pain that can lead to swelling, bruising and difficulty walking up or down stairs. Severe pain and immobility characterize full ruptures; you cannot contract the muscle and it may appear to "bunch" or form a visible knot under your skin.
Popping Sensation
Experiencing a popping sensation or sound in your calf muscle can indicate a tear, according to Aurora Health Care. This event is often accompanied by pain and potential bruising. The tear can involve the Achilles tendon; with each calf muscle contraction, your Achilles tendon and your heel are pulled upward. Typically pain and bruising is involved in an Achilles rupture, but mild discomfort and difficult movement are also possible.
Diagnosis and Treatment
See your doctor or a sports medicine specialist to determine the cause of your symptoms. An MRI or other diagnostic tool can be helpful in elucidating the extent of your injury. In cases of pain and swelling, ice packs are recommended to reduce inflammation. Avoid activities that aggravate your symptoms. Gently stretching your calf muscles can relieve tightness and improve your mobility.
