Aamodt A

Albanese CV

Bergmann G

Bland JM

Bobyn JD

Frost HM

Herrera A

Huiskes R

Jasty M

Laine HJ

McLeish RD

Morrey BF

Mullender MG

Ostbyhaug PO

Pilliar RM

Soballe K

Sumner DR

Taylor M

Tonino AJ

Van der Wal BC

Van Rietbergen B

Walker PS

An anatomical stem should be short enough to avoid distal locking and distal load transfer but long enough to ensure adequate primary stability of the stem. In this in vitro study, the cortical strains in the femur and the primary stability of the stem were measured after insertion of Anatomic Benoist Girard-I anatomical stems with gradually reduced stem length in six human cadaver femurs in order to find the optimal stem length. A shortening of 40–50 mm, corresponding to a stem extending 30–40 mm below the lesser trochanter, did not affect stem stability but nearly normalized the load distribution in the lower metaphysis and upper diaphysis. The large strain shielding observed in the calcar region was not influenced by shortening of the stem.</jats:p

Per Olav Østbyhaug

Jomar Klaksvik

Pål Romundstad

Arild Aamodt

Crossref

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine

Shortening of an anatomical stem, how short is short enough? An in vitro study of load transfer and primary stability

Shortening of an anatomical stem, how short is short enough? An in vitro study of load transfer and primary stability

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