Hiza-soto-muso
膝外無双 · outer knee twist-down · said hee-ZAH SOH-toh MOO-soh
Also known as soto-muso (Sumo)
Barred in competition
Demonstrations
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Where this technique is not allowed
Penalised in competition: the blocking hand works directly on uke's leg, which current IJF rules answer with a shido. Outside contest the technique is unaffected.
Under contest rules
Shido. The blocking hand works on uke's leg, which draws a shido.
Sport and Organisation Rules of the International Judo Federation: refereeing rules, 2026 edition, Article 18.1.2.
Still taught, demonstrated and examined, so it is written up in full here. The restriction above is a contest rule, not a reason to skip it. See the prohibited techniques list.
About this technique
The outer knee twist-down, borrowed from sumo's soto-muso: one hand leaves its grip to press the outside of uke's knee, and the other hand and chest twist them down backwards over the blocked leg. A rarity of international contest footage rather than the Kodokan classification, documented here under the name the video libraries use.
Key points
- Break the balance to the rear corner before the hand goes to the knee
- The palm blocks the outside of the knee; the block holds still while the body turns
- Twist with the remaining grip and your chest, steering them down over the blocked leg
Suggest an edit to Key points for Hiza-soto-muso
Te-waza (hand techniques)
At a glance
, classification, Gokyo set, Kodokan number, contest rules, grades that require it
- What it is
- Nage-waza (throwing techniques), Te-waza (hand techniques).
- Contest rules
- Shido. The blocking hand works on uke's leg, which draws a shido.
In competition
, how often it scores at IJF level, and two contests where it worked
No score recorded in senior IJF competition between 2020 and 2026, across 73,099 contests. That is a fact about modern contest judo rather than a gap in the data: the technique is taught, examined and classified, and it does not score at this level.
In combinations, counters and transitions
, none recorded yet
None recorded yet. Nobody has written down a counter to Hiza-soto-muso, or a combination it belongs to. You can suggest one.
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