Purpose: To compare gait kinematics and kinetics in five-year old children treated initially with Ponseti casting versus French physical therapy. A third group, consisting of patients initially treated with these non-operative methods and then undergoing surgery consisting of more than a tendoachilles lengthening, was compared to those children treated entirely non-operatively.

Method: Ninety patients (125 clubfeet) were tested at age five years. Thirty-four feet had undergone only Ponseti treatment, 40 the French program, and 51 had initial non-operative treatment with either the Ponseti or French protocols but later had surgery at an average age of 2+3 years. Kinematics and kinetics were compared to age-matched normal subjects.

Results: Average stance-phase dorsiflexion did not differ between groups or from normal. Incidence of equinus: French 5%, Ponseti 0%; Increased stance-phase dorsiflexion: French 3%, Ponseti 24%, Surgical 18% (p < 0.05). A similar number of feet that were not operated upon at age five had in-toeing: 30% French, 32% Ponseti. Decreased ankle power generation at push-off: 53% French; 47% Ponseti; 67% Surgical. Average ankle power generation: 2.21 W/kg French, 2.36 W/kg Ponseti, 1.97 W/kg Surgical (2.83 W/kg in normal 5-year-old children). There was a difference in ankle power generation between normal feet and both the French and surgical groups (p< 0.001). Feet in the non-operative groups that had undergone Achilles tenotomy (n=28) had similar ankle power to those feet (n=42) that did not have tenotomies (p =0.223). Hip power generation was increased 33% in children who had undergone Ponseti treatment (1.38 W/kg), and 41% after French nonoperative treatment (1.47 W/kg), compared to normal (1.04 W/kg). This may be to compensate for poor ankle push-off.

Conclusion: The gait characteristics of those feet that have not had surgery reveal that the majority had normal ankle kinematics, but reduced efficiency is demonstrated by reduced ankle push-off power, regardless of whether or not an Achilles tenotomy was performed. Decreased ankle power and persistant internal rotation are more frequently seen in feet that have undergone surgery despite initial nonoperative treatment, compared to those treated only by either the Ponseti protocol or the French physical therapy program.

To evaluate the gait of five-year old children with club-feet initially treated non-operatively with the French functional technique and to compare these results to the data from this same cohort at the age of two years. Thirty-three patients (fifty-two idiopathic clubfeet) were initially treated with the French functional (physiotherapy) program. At the age of two years, no child underwent surgery for its clubfoot. Gait Analysis was performed with the VICON system (kinematics). At the age of five years, these patients were all re-evaluated in the gait laboratory.

Of the thirty-three patients (fifty-two clubfeet) initially treated non-operatively and tested in the gait lab at two years of age, thirty-seven feet required subsequent surgery by the age of five years. This included posterior release (41%), posteromedial release (35%), tibial osteotomy (19%), and tendo Achilles lengthening (5%). The proportion of feet with the following gait parameters changed significantly (p< 0.05) between the ages of two and five years: Equinus (15% at 2 yrs vs. 2% at 5 yrs), Calcaneus (7% vs. 23%), Foot Drop (18% vs. 4%). The proportion of patients with internal foot progression angle did not change over this time (46% vs. 50%), nor did the proportion with normal sagittal plane ankle motion (61% vs. 54%). At age two years, the majority of patients treated with the French Functional non-operative treatment had normal sagittal plane ankle motion. Gait disturbances, when present at this age, were generally ankle equinus, foot drop and in-toeing. By the age of five years, 71% of these patients underwent surgery for their clubfeet. When re-tested in the gait laboratory at age five years, the proportion of feet with normal sagittal plane ankle motion did not change significantly, however, their resultant gait disturbances, when present, were predominantly calcaneus rather than equinus and foot drop. By treating patients with clubfeet with the French Functional technique exclusively, equinus gait may result in a small proportion.

By subsequently treating these patients surgically after the age of two years, over-lengthening or over-release may occur and result in calcaneus gait. The French originators of this technique now incorporate an early gastrocsnemius fascial lengthening as part of their technique. This modification of their technique should improve the gait characteristics observed at two years of age and should decrease the necessity for late surgery that may have contributed to the gait characteristics observed at five years of age.