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Areas of clinical interest. A) Lateral region, below the greater trochanter [Gruen zones 1,2,3], B) Calcar region, 15mm below the osteotomy plane [Gruen zones 7,8,14], C) Profile line along linea aspera [through Gruen zones 7,13,12,11] and D) Cortical Bone region at the stem tip [Gruen zones 4,11].
