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The biomechanics of the spine leads us to think that a low efficiency of the erector muscles (EM) produces an overload on the vertebral body. In the literature, the relationship between BMD and muscle strength has been shown1-2 but there are no reliable data concerning the relationship between trunk muscles and vertebral f ractures in osteoporotic patients. 3 In a lot of studies reduced back muscle endurance has been identified as a potential personal risk factor for developing cronic low back pain (CLBP).7 The most widely studied test in the literature is the Soerensen test, but there are doubts about the exclusive involvement of the EM and there is serious hazard when applied in patients with osteoporosis. 4-5 The tests with instrumental dynamometers are very accurate but, there is no common protocol for implementation6 and their costs are very expensive.

A new functional test for the evaluation of the erector muscles of the spine: the Back Extensor Test (BET)