Internal Rotated Tibia: What is the SCP?

• A. Lateral tibial crest at fibular head
• B. Medial tibial ridge distal to tibial tuberosity
• C. Posterior tibial border
• D. Anterior tibial tuberosity

Answer: (B)

In assessing internal tibial rotation, you need a reliable, fixed landmark on the tibia that you can palpate consistently. The medial tibial ridge just distal to the tibial tuberosity serves this role well. It sits on the medial side of the tibia, just below the tuberosity, and provides a stable reference point along the shaft to orient rotation measurements. That’s why this point is used as the SCP.

The other sites aren’t suitable references for this purpose: the lateral tibial crest near the fibular head sits on the opposite (lateral) side, the posterior tibial border is behind the leg and not a convenient, consistent palpation landmark, and the anterior tibial tuberosity is an anterior projection that doesn’t give a medial reference for tibial rotation.