S
Sagittal plane
The sagittal plane is the plane of a body 'slice' in a front to back direction.
Sag sign
The sag sign indicates a possible incompetency of the posterior cruciate ligament.
Saphenous nerve
The saphenous nerve is the nerve branching off from the larger femoral nerve, and which transmits sensation on the inner aspect of the leg. Page updated June 2024 by Dr Sheila Strover (Clinical Editor)
Scaffold
A scaffold in orthopaedics is a framework that is used to facilitate regenerating a damaged tissue or bone.
Schatzker classification
The Schatzker classification is a visual system for the classification of tibial plateau fractures types I - VI. Page updated July 2024 by Dr Sheila Strover (Clinical Editor)
Schenck Classification
The Schenck Classification gives an idea of the degrees of knee dislocation based on the number of ligaments damaged, and the presence of associated fractures.
Screw home mechanism
The screw home mechanism is a bony rotation in the joint that allows it to lock back and keep the knee stable while standing upright. Page updated May 2024 by Dr Sheila Strover (Clinical Editor)
Second look arthroscopy
A 'second look' arthroscopy is when a patient is pro-actively booked to have an arthroscopy just to check up on a previous surgical procedure.
Segond Fracture
A Segond Fracture is an avulsion of a small chip of bone off the lateral side of the femur, commonly seen in association with an anterior cruciate ligament rupture.
Semi-lunar cartilage
A semi-lunar cartilage is the old-fashioned name for a meniscus. 'Semi-lunar' means 'half-moon' and refers to the shape of the meniscus.