Kneeling position for operations on the lumbar spine; especially for protruded intervertebral disc.

@article{Ecker1949KneelingPF,
  title={Kneeling position for operations on the lumbar spine; especially for protruded intervertebral disc.},
  author={Ady Ecker},
  journal={Surgery},
  year={1949},
  volume={25 1},
  pages={112}
}