The Role of Physiotherapy After Cruciate Repair
Surgery to repair a ruptured cranial cruciate ligament is one of the most commonly performed orthopaedic procedures in veterinary medicine, and for most dogs it is a necessary step toward regaining functional use of the affected leg. However, the surgery itself is only part of the recovery story. The weeks and months that follow are where the outcome is truly determined, and physiotherapy during this period has a direct effect on how well the dog returns to normal mobility.
Muscle atrophy begins within 48 hours of a limb being protected from weight-bearing. By the time a dog is discharged from surgery, loss of muscle mass in the affected limb has already begun. Without structured rehabilitation, many dogs develop compensatory movement patterns that place excessive strain on the opposite limb, contribute to back problems, and result in less complete functional recovery than would otherwise be possible. Physiotherapy counteracts this by promoting early, controlled use of the limb and progressively rebuilding the muscle and proprioceptive awareness the joint needs to be stable.
The First Two Weeks: Passive Movement and Gentle Stimulation
During the initial post-operative period, exercise is highly restricted and the focus is on managing swelling, maintaining basic joint mobility, and beginning neural reconnection between the dog's brain and the operated limb.
Passive Range of Motion Exercises
With the dog lying on its side on a comfortable surface, gently flex and extend the knee (stifle) joint through its available range of motion without forcing any movement. Hold each position for a few seconds and repeat 10 to 15 times per session, two to three times per day. The goal is not stretching but maintenance of the movement the joint currently has, which helps prevent the development of fibrosis and scar tissue that can restrict motion long-term. If the dog shows any sign of pain during this exercise, stop and contact your vet or physiotherapist.
Cold Therapy
Applying a cold pack wrapped in a thin towel to the surgical site for 10 minutes, three to four times daily, reduces inflammation and associated pain during the immediate recovery window. Cold therapy is most useful in the first 72 hours and can be continued for up to two weeks if the site remains visibly swollen.
Short, Controlled Lead Walks
Most post-operative protocols permit very short lead walks from day two or three, specifically to encourage toe-touching and early weight-bearing. These should be slow, on a short lead, on a flat non-slip surface, and no longer than three to five minutes initially. The dog should not be allowed to pull, sniff excitedly, or react to other animals during this phase. The purpose is proprioceptive stimulation, not exercise.
Weeks Three to Eight: Active Strengthening Begins
As the surgical site heals and the dog's confidence with the limb increases, the rehabilitation programme introduces exercises that ask the muscles to work actively.
Sit-to-Stand Repetitions
Ask the dog to sit squarely with both hindlimbs symmetrically positioned, then stand, then sit again. Repeat 10 times per session. This exercise targets the quadriceps and gluteal muscles and promotes symmetrical weight-bearing through both hindlimbs. Many dogs after cruciate surgery instinctively shift weight to the unaffected side when sitting; if this happens, gentle repositioning of the affected leg to a symmetrical position during the exercise helps correct this habit.
Weight Shifting
With the dog standing on a non-slip surface, place your hands gently on its sides and apply very light lateral pressure, encouraging the dog to shift its weight onto the operated limb. Hold for five seconds, release, and repeat several times. This exercise is deceptively simple but highly effective at retraining the nervous system to accept load through the limb.
Walking Over Cavaletti Poles
Once the dog is consistently weight-bearing at a walk, introducing ground poles — placed at intervals appropriate to the dog's stride length — encourages higher, more deliberate foot placement and increased flexion of the stifle joint. Start with two to three poles and build gradually. The poles should be on a non-slip surface and the dog should be walked slowly enough that it steps over rather than around them.
Hydrotherapy
Underwater treadmill therapy is one of the most valuable tools in cruciate rehabilitation and is typically introduced between weeks four and eight depending on wound healing. The buoyancy of water reduces the concussive load on the joint while allowing the dog to work the muscles of the hindlimb through a full walking cycle. Most dogs progress more quickly in measurable strength and symmetry with regular hydrotherapy than with land-based exercise alone during this phase.
Weeks Eight to Sixteen: Building Endurance and Function
- Gradually increasing walk duration, adding five minutes per week as tolerated
- Introducing gentle inclines and declines on lead, which increase muscular demand through the hindquarters
- Figure-of-eight walking patterns at slow pace to encourage lateral movement and hip flexibility
- Balance exercises using a wobble board or balance disc, which challenge proprioception and build intrinsic stabilising muscle groups around the stifle
What to Watch for During Rehabilitation
Some degree of post-exercise tiredness is expected and appropriate. However, increased lameness the morning after exercise, swelling at the surgical site, heat in the joint, or reluctance to weight-bear that was not present before are all signs that the current exercise intensity is too high. Rest for 24 to 48 hours and reassess. If symptoms persist or worsen, contact your vet.
The opposite leg carries significantly increased load after cruciate surgery and is at higher risk of sustaining its own rupture. Studies suggest that between 40 and 60% of dogs that rupture one cruciate ligament will rupture the other within two years. Keeping the dog at a healthy weight and not progressing rehabilitation too quickly significantly reduces this risk.
Working With a Veterinary Physiotherapist
While the home exercises outlined here form a useful foundation, individual dogs vary significantly in their rate of recovery, and a tailored programme developed and monitored by a qualified canine physiotherapist will consistently produce better outcomes than a generalised approach. In the UK, look for practitioners registered with the ACPAT (Association of Chartered Physiotherapists in Animal Therapy) or the IAAT, both of which require relevant physiotherapy qualifications and specific animal therapy training. The investment in professional guidance during the critical rehabilitation window is one that pays dividends in long-term joint health and function.