Contracture (M. gracilis)

A contracture of the M. gracilis is a pathological shortening of this slender adductor muscle on the inside of the thigh, which leads to permanent restriction of movement in the hip and knee joints.

Where is the M. gracilis located and what does it do?

The M. gracilis runs from the pubic bone to the upper end of the tibia. It pulls the leg towards the midline of the body, a movement that is constantly modulated during normal gait. In the case of a contracture, this muscle shortens permanently and loses its elasticity.

The problem: The dog can no longer move the affected hind leg normally outwards or extend it fully. Often, a characteristic “sickle” gait pattern develops, in which the leg describes an arc when being advanced.

How does an M. gracilis contracture develop?

The most common cause is injuries followed by scar tissue formation in the muscle tissue. Particularly after deep lacerations or surgical interventions on the thigh, connective tissue can form that “pulls” the muscle together.

In young dogs, a contracture can also develop after prolonged immobilisation; the muscle essentially “forgets” its normal length. Congenital shortenings or consequences of muscle diseases are rarer.

How do I recognise an M. gracilis contracture?

The most noticeable sign is the altered gait: The dog moves the affected leg outwards when walking, rather than placing it straight forward. At rest, the leg is often slightly turned inwards.

You can perform a simple test: Lift the affected leg and try to move it gently outwards. In the case of a contracture, you will feel distinct resistance; the muscle cannot be stretched or only with pain.

What treatment options are available?

The therapy depends on the severity. In mild cases of contracture, intensive physiotherapy and daily stretching exercises over several weeks can show success. The muscle is gradually “trained” back to its normal length.

In pronounced shortenings, surgical severing of the muscle is often necessary. This procedure sounds drastic, but with correct execution it is very successful; the dog can usually walk normally again afterwards. The M. gracilis is not essential for locomotion.

In my assessment, the physiotherapy option is often given up too quickly. With consistent application over 8–12 weeks, we see improvements even in moderate cases.