The new AO classification system for intertrochanteric fractures allows better agreement than the original AO classification. An inter- and intra-observer agreement evaluation

•A new AO classification for trochanteric fractures was recently published; no studies have evaluated its inter- and intra-observer agreement.•We assessed 68 intertrochanteric fractures; fractures were classified using the original and the new AO classifications.•The inter-observer agreement using the new AO classification was significantly better than using its original version.•The new AO classification system allowed better agreement when distinguishing stable from unstable patterns.