We employed joint traction, passive muscle stretching and isometric exercises, active resisted and proprioception exercises. The treatment in this group consisted of two sessions per week for one hour each.

This group received educational sessions and home exercises. The exercises are aimed at improving quadriceps strength, flexibility, range of motion and knee proprioception.

Each educational session of 90 minute every two weeks, with exercises daily home

The control group (group C) did not receive any treatment. The patients of this group were assessed by the same reviewers and under the same conditions as the subjects of the two intervention groups.

5 minutes. Thermotherapy shallow to 50 cm away from the knee. 15 minutes. Joint traction, grade I-II. Fixation of distal femur with cinch and manual fixation of proximal tibia. Patient in prone position and the traction is carried out in the submaximal ranges of flexion and extension.

10 minutes. Passive muscle stretching of quadriceps (within the limits of mobility), through compression muscle, passive muscle stretching and relaxation of muscle.

10 minutes. Isometric and resisted exercises of quadriceps, in submaximal ranges, of flexion and extension.

10 minutes. Proprioception exercises with unipodal support, with and without visual support, and posterior destabilization.

10 minutes. Local cryotherapy with ice pack.

Measurement of knee flexion and extension using a universal goniometer. Were taken as anatomical references, are indicated by Querol et al, using the reference method 0 to the mobile arm of the goniometer, as noted Norkin et al.

Measurement in the thigh, in two thirds of the flow distance between the anterior superior iliac spine and the joint line of the knee, using a tape measure

Measured by the rupture test for hemophilia patients (with a gradation of 0 to 5 points, with 0 indicating normal strength and 5 is the absence of muscle contraction).

Using the visual analog scale, VAS, consisting of a gradation of 0 to 10 points (from no pain to worst pain imaginable).

We use the Petterson scale which consists of 13 items (0 indicates a normal joint and joint deterioration 13 maximum).

Age of patient (years), Weight of patient (kg), Number of ankle haemarthrosis in previous year, Type of haemophilia (A or B), Severity of haemophilia (severe or moderate), Treatment (prophylaxis or on demand).