Hip prosthesis zones

The Gruen zones is a system of dividing the interface between the femoral component of a hip arthroplasty and the femur bone moving from lateral to medial calcar, when viewing an AP radiograph of the hip, clinically useful to record the appearance of lucent areas when assessing the outcome of the operation.

See also: Charnley zone

Classification

Zone	Description
I	Greater trochanter
II
III
IV	Distal to tip
V
VI
VII	Lesser trochanter

References

Gruen, TA; McNeice, GM; Amstutz, HC (1979). "Modes of failure of cemented stem-type femoral components: a radiographic analysis of loosening". Clin Orthop Relat Res. 141: 17–27. PMID 477100.