PMC3352606_01
A 59-year year-old male with avulsion injury of plantaris tendon at musculotendinous junction. (a) Axial short tau inversion recovery (STIR) shows hyperintense plantaris tendon (open white arrow) beneath the gastrocnemius (G) and superficial to soleus (S) in the right calf. Normal left calf is seen. (b) Axial T1 shows isointense plantaris tendon (open white arrow) beneath the gastrocnemius (G) and superficial to soleus (S) in the right calf. (c,d) Serial Sagittal T2 images of leg show the plantaris tendon (P) avulsion and proximal retraction of torn end (arrow in figure d).
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F1
MRI showed an elongated lesion in the calf between the gastrocnemius and soleus muscles, toward the medial head of gastrocnemius muscle [Figure 1] in the plantaris muscle. T1-weighted image indicating hemorrhage [Figures 1a and b]. The muscle showed avulsion at musculotendinous junction with proximal retraction of the torn end which was seen in the mid leg region [Figures 1c and 1d]. The gastrocnemius and soleus muscles were normal.
PMC3352606_02
A 40-year year-old male with rupture of plantaris muscle and Grade 1 injury of gastrocnemius muscles in the right calf. (a) Axial short tau inversion recovery (STIR) of calf shows fluid collection (open white arrow) hyperintense on short tau inversion recovery (STIR) between the gastrocnemius medial head (Gm) and soleus (S) muscles which represents the torn plantaris muscle. (b) Coronal short tau inversion recovery (STIR) of calf shows a hyperintense fluid collection (solid arrow) between the gastrocnemius and soleus (S) muscles which represents the torn plantaris muscle (P). Superiorly it extends upto the lateral condyle of femur (open white arrow), the site of origin of plantaris tendon. (c) Coronal T1 (figure c) of calf shows fluid collection (solid arrow) hypointense on T1 between the gastrocnemius and soleus muscles which represents the torn plantaris muscle. (d) Coronal short tau inversion recovery (STIR) of calf that shows hyperintense signal (solid arrows) in a part of the gastrocnemius muscles (G) in the calf, represents Grade 1 injury.
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F2
T1-weighted image [Figure 2c]. This lesion was in the calf between the gastrocnemius and soleus muscles, toward the medial head of gastrocnemius muscle and represented a torn plantaris muscle. Superiorly the lesion extended up to the lateral condyle of the femur [Figure 2b], the site of origin of the plantaris muscle. Hyperintense signal seen in a part of the gastrocnemius muscles in the calf, represented a Grade 1 injury to the muscle [Figure 2d].