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| Renjit Thomas Issac,Hitesh Gopalan,Mathew Abraham,Cherian John,Sujith Mathew Issac,Diju Jacob.[J].Chin J Traumatol,2016,19(3):151-155. [doi] |
| Preoperative determination of tibial nail length: An anthropometric study |
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| DOI： |
| KeyWord: Preoperative periodTibial fracturesBone nailsHuman engineering |
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| Author Name | Affiliation | | Renjit Thomas Issac | Department of Orthopaedics, Malankara Orthodox Syrian Church Medical College, Kolenchery, Kochi, Kerala 682311, India | | Hitesh Gopalan | Department of Orthopaedics, Malankara Orthodox Syrian Church Medical College, Kolenchery, Kochi, Kerala 682311, India | | Mathew Abraham | Department of Orthopaedics, Malankara Orthodox Syrian Church Medical College, Kolenchery, Kochi, Kerala 682311, India | | Cherian John | Department of Orthopaedics, Malankara Orthodox Syrian Church Medical College, Kolenchery, Kochi, Kerala 682311, India | | Sujith Mathew Issac | Department of Orthopaedics, Holy Ghost Mission Hospital, Muttuchira, Kottayam, Kerala 686613, India | | Diju Jacob | Department of Orthopaedics, Malankara Orthodox Syrian Church Medical College, Kolenchery, Kochi, Kerala 682311, India |
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| Abstract: |
| Objective: To assess the correlation between five anthropometric parameters and the distance from tibial tuberosity to medial malleolus in 100 volunteers.
Methods: Six anthropometric parameters were measured in 50 male and 50 female medical students
using a metallic scale: medial knee joint line to ankle joint line (K-A), medial knee joint line to medial malleolus (K-MM), tibial tuberosity to ankle joint (TT-A), tibial tuberosity to medial malleolus (TT- MM), olecranon to 5th metacarpal head (O-MH) and body height (BH). Nail size predicted based upon TT-MM measurement was chosen as ideal nail size. A constant was derived for each of the six anthropometric parameters which was either added or subtracted to each measurement to derive nail size. A regression equation was applied to BH measurements. Nail sizes calculated were compared with that obtained from TT-MM measurement and accuracy was evaluated. Accuracy of O-MH and BH regression equations recommended by other authors were calculated in our data.
Results: Adding 11 mm to TT-A distance had highest accuracy (81%) and correlation (0.966) in predicting nails correctly. Subtracting 33 mm from K-MM measurement and 25 mm from K-A distance derived accurate sizes in 69% and 76% respectively. Adding 6 mm to O-MH distance had a poor accuracy of 51%. Nail size prediction based upon body height regression equation derived correct nail sizes in only 34% of the cases. Regression equation analysis by other authors based on O-MH and BH distances yielded correct sizes in 11% and 5% of the cases respectively.
Conclusion: TT-A, K-A and K-MM measurements can be used simultaneously to increase accuracy of nail
size prediction. This method would be helpful in determining nail size preoperatively especially when
one anatomic landmark is difficult to palpate. |
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