title: Squat exercise to estimate knee megaprosthesis rehabilitation: a pilot study.
abstract: [Purpose] This study evaluated a specific rehabilitation protocol using a half squat after total knee reconstruction with distal femur megaprosthesis and tibial allograft-prosthesis composite. [Subject and Methods] Squat execution was recorded by a three-dimensional system before and after a specific rehabilitation program on a 28-year-old patient. Squat duration, body center of mass trajectory, and vertical range of motion were determined. Step width and joint angles and symmetry (hip flexion, extension, and rotation, knee flexion, and ankle dorsal and plantar flexion) were estimated. Knee and hip joint symmetry was computed using a bilateral cyclogram technique. [Results] After rehabilitation, the squat duration was longer (75%), step width was similar, and vertical displacement was higher. Hip flexion increased by over 20%, and ankle dorsiflexion diminished by 14%. The knee had the highest symmetry gain (4.1-3.4%). Angle-angle plot subtended areas decreased from 108° to 40°(2) (hip) and from 204° to 85°(2) (knee), showing improvement in movement symmetry. [Conclusion] We concluded that the squat is an effective multifactorial exercise to estimate rehabilitation outcomes after megaprosthesis, also considering that compressive and shear forces are minimal up to 60-70° of knee flexion.
authors: Laboratorio di Anatomia Funzionale dell'Apparato Locomotore, Functional Anatomy Research Center (FARC), Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy.
authors: Nicola
authors: N
authors: Lovecchio
authors: Laboratorio di Anatomia Funzionale dell'Apparato Locomotore, Functional Anatomy Research Center (FARC), Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy.
authors: Matteo
authors: M
authors: Zago
authors: Scuola di Specializzazione in Medicina Fisica e Riabilitazione, Università degli Studi di Milano, Italy.
authors: Luciana
authors: L
authors: Sciumè
authors: S.C. Medicina Fisica e Riabilitazione, Istituto Ortopedico G. Pini, Italy.
authors: Maurizio
authors: M
authors: Lopresti
authors: Laboratorio di Anatomia Funzionale dell'Apparato Locomotore, Functional Anatomy Research Center (FARC), Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy.
authors: Chiarella
authors: C
authors: Sforza
keywords: Half-squat; Knee ROM; Knee prosthesis