Arthroscopy of the Subtalar Joint

Posterior subtalar impingement syndrome due to symptomatic os trigonum

Flexor hallucis longus tenosynovitis

Arthrofibrosis

Subtalar arthrosis

Calcaneal/talar fracture reduction control

Osteochondral lesions

Range of motion of the subtalar joint must be addressed and compared with the opposite side, and pain must be evaluated either on physical examination or after anesthetic injection ( Fig. 42.1 ).

Anteroposterior, lateral, and oblique (Brodén) views of the ankle should help to evaluate subtalar architecture ( Fig. 42.2 ).

Computed tomography scan must be ordered with axial and semicoronal cuts to evaluate all three subtalar facets ( Fig. 42.3 ).

Magnetic resonance imaging can rule out soft-tissue pathology and better evaluate intraosseous subchondral compromise.

Three facets of the subtalar joint: posterior, medial, and anterior ( Fig. 42.4A [talar side], Fig. 42.4B [calcaneal side])

Oblique and curved fashion of the subtalar joint ( Fig. 42.4C )

Peroneal tendons, flexor hallucis longus tendon, and interosseous ligament ( Fig. 42.5 )