The purpose of this study was to review a series of equivalents of perilunate dislocations and fractures-dislocations (PLDs-PLFDs) where there was no dislocation of the capitate from the lunate on the initial radiographs. We propose to include these injuries as a PLIND Group of perilunate injuries in a modified perilunate injuries classification.

A review of possible PLIND injuries was done in a single academic centre over a 5-year period. All cases presenting at the acute stage with displaced fractures of scaphoid, lunate, triquetrum or capitate along with perilunate gaps but no true dislocation of the capitate from the lunate in the sagittal or coronal planes were retrospectively analyzed.

We identified 15 patients with PLIND injuries (13 acute and 2 chronic) within the index period. Four cases with clinical and radiological follow-up will be presented.

Equivalents of PLDs-PLFDs presenting without dislocation of the capitate from the lunate do exist. There is currently no specific denomination for these injuries, which may be overlooked despite their severity. Indeed they may need a complex osseous and ligamentous injuries management. Including them into an existing perilunate injuries classification highlights their regognition and allows for a better understanding and treatment of both acute and chronic non-dislocated perilunate injuries.