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Cosmetic Impact of Knee Joint in Knee Disarticulation Prosthesis

This study evaluates the cosmetic effects of knee joint in knee disarticulation prostheses by measuring thigh lengthening and shank shortening. Results show varying degrees of lengthening and shortening, debunking the notion that knee disarticulations lead to disproportions.

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Cosmetic Impact of Knee Joint in Knee Disarticulation Prosthesis

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  1. Cosmetic effect of knee joint in a knee disarticulation prosthesis Fred A. de Laat, MD, PhD; Mark J. van der Pluijm, CPO; Annette A. van Kuijk, MD, PhD; Jan H. Geertzen, MD, PhD; Leo D. Roorda, MD, PT, PhD

  2. Aim • Assess cosmetic effect of knee joint in knee disarticulation (KD) prosthesis by determining extent of thigh lengthening and shank shortening. • Relevance • Despite advantages, KDs are rarely performed because of anticipated KD prosthesis fitting problems.

  3. Method • Thigh lengthening and shank shortening in 18 knee joints were measured by experimental setup using laser techniques.

  4. Results • Thigh lengthening: • Varied between 23 and 92 mm. • Polycentric knees Medi KH6 and Medi KFM1 showed least lengthening. • Shank shortening: • Varied between 3 and 50 mm. • Polycentric knees Teh Lin Prosthetic & Orthotic Co. Ltd Graph-Lite and Medi KP5 showed least shortening.

  5. Conclusion • With global 25 mm lengthening of thigh and 10 mm shortening of shank, cosmetic argument for avoiding KDs is no longer valid.

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