The Össur Unloader One has a lightweight, perforated frame with flexible thigh and calf shells, a single side hinge and two crossing Dynamic Force System straps. The photographed SmartDosing configuration has two strap dials, color-coded Quick Fit buckles and lined shells.
Lightweight, low-profile frame with perforations and flexible thigh and calf shells.
Single polycentric side hinge and an open-knee design.
Two crossing Dynamic Force System straps.
SmartDosing configuration with strap dials; the exact-model catalog also lists a ratchet configuration.
Color-coded Quick Fit buckles and Quick Connect strapping.
Breathable liners with proprietary Sensil silicone liner options.
Published Standard and Short frame lengths, with separate right-medial, right-lateral, left-medial and left-lateral configurations.
Product details and sizing stay here with BFY. This showcase is educational; your clinician guides product selection and use.
BFY / SIZING & FIT
Find your fit.
Product sizing information stays here with Befitting You. Our team can help confirm measurements and fitting requirements.
BFY can confirm size, frame length and the published configuration in person. Ask BFY for fitting assistance at shared size boundaries or outside the published ranges.
Unloader One — Standard with SmartDosing
Measurement: Calf circumference measured 15 cm (6 inches) below mid-patella, with the leg in extension. The manufacturer publishes both inch and centimeter ranges.
Unloader One — Standard with SmartDosing — sizing reference
Size
Calf circumference (in)
Calf circumference (cm)
Small
12.2–14
31–36
Medium
14–16.75
36–43
Large
16.75–20
43–51
X-Large
20–24
51–61
Standard has Small through X-Large in the exact-model catalog; X-Small is listed only for Short.
The same ranges are published for right medial, right lateral, left medial and left lateral.
Published Standard frame-length reference: height between 5 feet 5 inches and 6 feet 4 inches, printed as 1,65 and 1.92 meters in the original catalog.
Both unit ranges are transcribed as published, not recalculated. Adjacent ranges share endpoints; no size-boundary priority is published.
This chart is for Unloader One, not Unloader One X or the separate Custom model.
Unloader One — Short with SmartDosing
Measurement: Calf circumference measured 15 cm (6 inches) below mid-patella, with the leg in extension. The manufacturer publishes both inch and centimeter ranges.
Unloader One — Short with SmartDosing — sizing reference
Size
Calf circumference (in)
Calf circumference (cm)
X-Small
9.8–12.2
25–31
Small
12.2–14
31–36
Medium
14–16.75
36–43
Large
16.75–20
43–51
X-Large
20–24
51–61
Short has X-Small through X-Large in the exact-model catalog.
The same ranges are published for right medial, right lateral, left medial and left lateral.
Published Short frame-length reference: height under 5 feet 5 inches, printed as 1,65 meters in the original catalog.
Both unit ranges are transcribed as published, not recalculated. Adjacent ranges share endpoints; no size-boundary priority is published.
This chart is for Unloader One, not Unloader One X or the separate Custom model.
Unloader One — Standard with Ratchet
Measurement: Calf circumference measured 15 cm (6 inches) below mid-patella, with the leg in extension. The manufacturer publishes both inch and centimeter ranges.
Unloader One — Standard with Ratchet — sizing reference
Size
Calf circumference (in)
Calf circumference (cm)
Small
12.2–14
31–36
Medium
14–16.75
36–43
Large
16.75–20
43–51
X-Large
20–24
51–61
The manufacturer publishes this ratchet configuration separately from SmartDosing; its circumference ranges are identical for the same frame length.
Standard has Small through X-Large; X-Small is listed only for Short.
The same ranges are published for right medial, right lateral, left medial and left lateral.
Published Standard frame-length reference: height between 5 feet 5 inches and 6 feet 4 inches, printed as 1,65 and 1.92 meters in the original catalog.
Both unit ranges are transcribed as published, not recalculated. Adjacent ranges share endpoints; no size-boundary priority is published.
This chart is for Unloader One, not Unloader One X or the separate Custom model.
Unloader One — Short with Ratchet
Measurement: Calf circumference measured 15 cm (6 inches) below mid-patella, with the leg in extension. The manufacturer publishes both inch and centimeter ranges.
Unloader One — Short with Ratchet — sizing reference
Size
Calf circumference (in)
Calf circumference (cm)
X-Small
9.8–12.2
25–31
Small
12.2–14
31–36
Medium
14–16.75
36–43
Large
16.75–20
43–51
X-Large
20–24
51–61
The manufacturer publishes this ratchet configuration separately from SmartDosing; its circumference ranges are identical for the same frame length.
Short has X-Small through X-Large.
The same ranges are published for right medial, right lateral, left medial and left lateral.
Published Short frame-length reference: height under 5 feet 5 inches, printed as 1,65 meters in the original catalog.
Both unit ranges are transcribed as published, not recalculated. Adjacent ranges share endpoints; no size-boundary priority is published.
This chart is for Unloader One, not Unloader One X or the separate Custom model.
Sizing is a product reference, not a treatment recommendation or a guarantee of fit. If you are between ranges or unsure of a measurement, talk with BFY before choosing a size.
