• J Orthop Surg (Hong Kong) · Apr 2014

    The Dorr type and cortical thickness index of the proximal femur for predicting peri-operative complications during hemiarthroplasty.

    • William Nash and Andrew Harris.
    • SE Thames Rotation, Queen Elizabeth Hospital, London, United Kingdom.
    • J Orthop Surg (Hong Kong). 2014 Apr 1; 22 (1): 92-5.

    PurposeTo assess the Dorr proximal femoral types and the cortical thickness index for predicting peri-operative complications during hemiarthroplasty.MethodsRecords of 53 male and 147 female elderly who underwent cemented or uncemented monopolar hemiarthroplasty for displaced intracapsular femoral neck fractures were reviewed. Any intra-operative fracture and postoperative dislocation within 30 days was recorded. The cortical thickness index was defined as the ratio of cortical width minus endosteal width to cortical width at a level of 100 mm below the tip of the lesser trochanter. Higher values indicated thicker cortices. The Dorr proximal femur morphology was classified into types A, B, and C.Results28 patients were excluded. The proximal femurs of the remaining 172 patients (mean age, 85 years) were categorised as Dorr type A (n=29), type B (n=75), and type C (n=68). The respective mean cortical thickness indices were 1.10, 0.79, and 0.65. Lower cortical thickness indices correlated with worse Dorr types (p<0.05). There were 18 intra-operative fractures; 8 and 10 occurred in Dorr types B and C femurs versus none in Dorr type A femurs (p=0.046). There were 5 postoperative dislocations; 3 and 2 occurred in Dorr types B and C femurs versus none in Dorr type A femurs (p=0.591). The mean cortical thickness index was significantly lower in those with a fracture (n=18) than those without a fracture (n=154) [0.59 vs. 0.81, p=0.0003].ConclusionDorr types B and C proximal femurs were at greater risk of intra-operative fracture.

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