Patient risk factors for instability (ASA; American Society of Anaesthesiologists; BMI: Body mass index).
|Age > 75 years||Female age > 70 years||Prior surgery (hip)|
|ASA grade > 3||Avascular necrosis||Fractured neck of femur|
|Inflammatory arthropathy||BMI > 3 kg/m2||Lumbar pathology|
|Degenerative disc disease||Lumbar canal stenosis||Lumbar fusion surgery|
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