Contributors of stiff knee gait pattern for able bodies: Hip and knee velocity reduction and tiptoe gait

• The potential of tiptoe gait and slowly propelling leg on stiff knee gait is tested.
• Slowly propelling limb caused stiff knee gait by reducing hip, knee flexion velocity.
• Tiptoe gait caused borderline stiff knee gait without lowering hip, knee velocity.
• Timing of peak knee flexion shorter in slowly propelling limb, longer in tip toe gait.
• Normalizing ankle motion instance, hastening limb in swing may treat some SKG causes.

Stiff-knee gait (SKG) is commonly encountered in clinic; many other gait abnormalities are seen together with this pathology. Simulation studies revealed that diminished knee flexion (KF) velocity and increased knee extension moments are strongly related with SKG. This study aimed to determine whether tiptoe walking and hip-knee flexion velocity reduction causes SKG pattern in healthy participants.MethodsFourteen able-bodied adults’ (Av. age: 23.0 ± 2.4) heel–toe (N), tiptoe (T), and walking with 5% body weight on both shanks (W) were analyzed using 3D gait analysis by controlling cadence (90 step/min). Repeated measures analysis of variance was used followed by Bonferroni correction (p < 0.05).ResultsWalking velocity and cadence were similar for all conditions (p > 0.1). Maximum hip flexion velocity was reduced (15%) significantly as well as the KF velocity (10%) in the W condition. The peak knee flexion (PKF) (8.3% for T, 8.6% for W) and total knee range (10.9% for T, 13% for W) were reduced for both conditions (p < 0.05). The knee range in early swing and the duration between toe-off and PKF were reduced only in the weighted-leg condition (p < 0.05).ConclusionsSlow hip and knee flexion diminished all SKG parameters except timing of PKF. Tiptoe gait itself generated a borderline SKG pattern by reducing the PKF and total knee range. By considering that tiptoe gait and SKG commonly seen together, some of the SKG contributors can be treated by normalizing the ankle motion in the stance and increasing the hip–knee flexion velocity by rigorously planned muscle lengthening procedures and effective strengthening exercises.